CN114035206A - High-anti-interference dual-channel multimode broadband radio frequency receiver for navigation system - Google Patents
High-anti-interference dual-channel multimode broadband radio frequency receiver for navigation system Download PDFInfo
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- CN114035206A CN114035206A CN202111144715.0A CN202111144715A CN114035206A CN 114035206 A CN114035206 A CN 114035206A CN 202111144715 A CN202111144715 A CN 202111144715A CN 114035206 A CN114035206 A CN 114035206A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/36—Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1081—Reduction of multipath noise
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
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- General Physics & Mathematics (AREA)
- Circuits Of Receivers In General (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention provides a high anti-interference dual-channel multimode broadband radio frequency receiver for a navigation system, which comprises an SPI interface module and two receiving channels, wherein each receiving channel comprises a broadband radio frequency front-end module, a local oscillator module, an intermediate frequency filter module, a gain amplifier module, an automatic gain amplification module and a 10-bit analog-to-digital conversion (ADC) module; each receiving channel obtains a differential intermediate frequency voltage signal according to multiple single-ended radio frequency voltage signals simultaneously received by the broadband radio frequency front end module and a local oscillator signal generated by the local oscillator module; and then, a first control instruction and a second control instruction are generated based on the automatic gain control module according to the amplitude of the digital signal, the differential intermediate frequency signal is processed by the intermediate frequency filter module and the gain amplifier module in sequence, and the analog signal is converted by the 10-bit analog-to-digital conversion ADC module to output the digital signal. The invention has the requirements of low power consumption, interference resistance and high integration level, and can be applied in the low voltage condition.
Description
Technical Field
The invention relates to the technical field of multi-mode, low power consumption and high integration of a wireless navigation system, in particular to a high-interference-resistance dual-channel multi-mode broadband radio frequency receiver for the navigation system.
Background
With the continuous development of scientific technology and the increase of electronic product applications, people have higher and higher requirements on navigation positioning. Currently, the global Navigation Satellite system gnss (global Navigation Satellite system) mainly includes four types: 1) the united states Global Positioning System (GPS); 2) the european Galileo satellite positioning system (Galileo); 3) russian global satellite navigation system (GLONASS); 4) the Chinese Beidou navigation System (BDS) can provide accurate position information all weather anytime and anywhere. In order to receive these navigation satellite signals as much as possible to achieve the purpose of improving the positioning accuracy, it is important to support a GNSS terminal, especially a radio frequency receiver, for receiving these navigation satellite signals. Therefore, research of radio frequency receivers compatible with multiple modes and multiple frequency bands becomes a hot spot.
In recent decades, semiconductor technology has iterated rapidly and integrated circuits have developed, and multi-mode, multi-frequency, high-integration radio frequency receivers have become possible. At present, some research institutions and companies at home and abroad continuously launch related high-precision navigation products, and the navigation products relate to that most of radio frequency receivers adopt each radio frequency channel to receive a mode positioning system. Therefore, it is necessary to receive satellite signals using four channels or even more channels to ensure that the desired navigation satellite positioning information can be received. The navigation satellite signal is very weak when reaching the earth, so that the navigation satellite signal is very easily influenced by other wireless communication or external interference signals. In order to suppress these influences, most of the navigation positioning systems need to use an off-chip Surface Acoustic Wave (SAW) filter, and need to use a SAW filter of a corresponding model according to the receiving of different navigation positioning systems, so that each channel needs to be selected to be of a proper type. These receivers not only add significant cost, but also result in the inability to flexibly adjust usage between channels. Therefore, although these navigation satellite systems can provide the high-precision real-time positioning requirement, the power consumption, volume and cost of the whole receiver system are increased, and it is difficult to meet the requirements of low power consumption, small volume and low cost.
With the continuous deepening of research and the continuous emergence of new architectures, research and reports of low-power consumption multi-mode radio frequency receivers continuously appear, for example, the paper A Dual-Channel Compass/GPS/GLONASS/Galileo Reconfigurable GNSS Receiver in 65nm CMOS With On-Chip I/Q Calibration proposes to adopt two independent channels to simultaneously receive navigation satellite signals of different frequency bands. Although the radio frequency receiver simplifies the number of channels to realize simultaneous reception of different frequencies, each mode can still receive only one mode. Therefore, it is difficult to satisfy the requirement of high-precision positioning by simultaneously receiving the navigation satellite signals in two modes at most. Also, new process nodes such as 28nm processes and smaller size processes emerge, and most system supply voltages are relatively low. Not only does such a conventional architecture receiver fail to further reduce single channel power consumption, but it is also difficult to use it at low voltage. Meanwhile, an external interference signal, particularly an in-band narrowband continuous wave, may cause signal blockage to a GNSS radio frequency receiver of a global navigation satellite system, thereby causing the receiver to be unable to normally acquire signals. Therefore, the rf receiver needs to have high anti-interference characteristics in the case of simultaneously receiving multimode navigation satellite signals. Some rf receivers implement the anti-interference feature of the system by increasing the adjustable range of the gain amplifier, but this further increases the receiver area and power consumption.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a high interference rejection dual-channel multimode wideband radio frequency receiver for navigation systems, which is used to solve the problems of high power consumption, low precision and poor interference rejection in the prior art, so as to be able to operate under low voltage condition.
In order to achieve the above objects and other related objects, the present invention provides a high anti-interference dual-channel multimode wideband radio frequency receiver for a navigation system, the high anti-interference dual-channel multimode wideband radio frequency receiver comprises an SPI interface module and two receiving channels, each receiving channel comprises a wideband radio frequency front end module, a local oscillator module, an intermediate frequency filter module, a gain amplifier module, an automatic gain amplification module and a 10bit analog-to-digital conversion module;
the local oscillator module is used for generating local oscillator signals required by the high anti-interference dual-channel multi-mode broadband radio frequency receiver;
the radio frequency input end of the broadband radio frequency front-end module receives navigation satellite signals of multiple frequency bands and multiple modes at the same time, and the local oscillator input end of the broadband radio frequency front-end module is connected with the output end of the local oscillator module; the broadband radio frequency front-end module has the characteristics of high integration and low power consumption and is used for obtaining a differential intermediate frequency voltage signal according to the navigation satellite signal and the local oscillator signal in a frequency conversion mode; the navigation satellite signal is a single-ended radio frequency voltage signal;
the input end of the intermediate frequency filter module is connected with the output end of the broadband radio frequency front end module, and the control end of the intermediate frequency filter module is connected with the output end of the automatic gain control module; the automatic gain control module is used for amplifying and filtering the differential intermediate frequency signal according to a first control instruction of the automatic gain control module to obtain a first analog signal; the intermediate frequency filter module can support switching between a low-pass mode and a band-pass mode;
the input end of the gain amplifier module is connected with the output end of the intermediate frequency filter module, and the control end of the gain amplifier module is connected with the output end of the automatic gain control module; the first analog signal is amplified according to a second control instruction of the automatic gain control module to obtain a second analog signal;
the input end of the 10-bit analog-to-digital conversion ADC module is connected with the output end of the gain amplifier module and is used for converting the second analog signal into an output digital signal; the automatic gain control module generates the first control instruction and the second control instruction according to the amplitude of the digital signal;
the SPI interface module is used for sending and receiving control signals;
the two receiving channels of the high anti-interference multi-channel multi-mode broadband radio frequency receiver for the navigation system can simultaneously receive navigation satellite signals of the same or different frequency bands, and each receiving channel can simultaneously receive satellite navigation satellite signals of multiple modes, so that the position information of the positioning accuracy is obtained.
Preferably, the adjusting and amplifying the first analog signal according to the second control instruction of the automatic gain control module includes:
adjusting the amplification factor of the gain amplifier module according to a second control instruction of the automatic gain control module;
amplifying the first analog signal according to the adjusted amplification factor of the gain amplification control module; the high anti-interference dual-channel multimode broadband radio frequency receiver is used for calculating the amplitude of the output signal of the high anti-interference dual-channel multimode broadband radio frequency receiver, judging whether the amplitude requirement of the navigation system signal processing is met or not, and then adjusting the amplification factor of the intermediate frequency filter module and the amplification factor of the gain amplifier module according to the generated first control signal and the second control signal until the amplitude of the output signal of the high anti-interference dual-channel multimode broadband radio frequency receiver meets the requirement.
Preferably, the wideband radio frequency front end module comprises a wideband low noise amplifier unit, a passive quadrature mixer unit and a transimpedance amplifier unit;
the input end of the broadband low-noise amplifier unit is connected with the single-ended radio frequency voltage signal and is used for realizing broadband impedance matching and amplifying and converting the single-ended radio frequency signal into two paths of differential radio frequency current signals;
the radio frequency input end of the passive quadrature mixer unit is connected with the output end of the broadband low-noise amplifier unit, the local oscillator input end of the passive quadrature mixer unit is connected with the local oscillator module, and the passive quadrature mixer unit adopts a complementary passive switch structure of an NMOS (N-channel metal oxide semiconductor) tube and a PMOS (P-channel metal oxide semiconductor) tube and is used for obtaining two paths of differential intermediate-frequency current signals according to the differential radio-frequency current signals and the local oscillator signals and outputting signals with a ground capacitor capable of further filtering high-frequency signals;
the input end of the transimpedance amplifier is connected with the output end of the passive quadrature mixer unit, and the output end of the transimpedance amplifier is connected with the input end of the intermediate frequency filter module; and the differential intermediate-frequency current signal processing module is used for converting each path of differential intermediate-frequency current signal into a differential intermediate-frequency voltage signal and further amplifying and filtering the navigation satellite signal.
Preferably, the intermediate frequency filter module adopts a capacitor array and a resistor array with an RC type structure.
Preferably, the 10-bit analog-to-digital conversion ADC module adopts an SAR-ADC architecture, an analog input end of the SAR-ADC architecture is connected to an output end of the gain amplifier module, and a digital output end of the SAR-ADC architecture is connected to an input end of the automatic gain control module, so as to adjust and reduce the amplification factor of the wideband radio frequency front-end module in a large dynamic range, and improve the anti-interference performance of the navigation system.
Preferably, the digital output end of the SAR-ADC architecture includes an I-path signal output interface and a Q-path signal output interface, and is configured to select the I-path signal output interface or the Q-path signal output interface for the output of the digital signal.
Preferably, the frequency range of the high anti-interference dual-channel multimode broadband radio frequency receiver is as follows: 1.15 GHz-1.65 GHz.
As described above, the high anti-interference dual-channel multimode broadband radio frequency receiver for the navigation system of the present invention has the following beneficial effects:
(1) the broadband radio frequency front-end module of the high-anti-interference dual-channel multimode broadband radio frequency receiver adopts a broadband receiving framework, not only realizes broadband impedance matching and signal amplification, but also can realize high-linearity orthogonal frequency conversion, and simultaneously converts a single-end signal into a differential signal under the condition of avoiding an off-chip balun and an on-chip balun, thereby realizing low power consumption, low noise and high integration degree;
(2) the automatic gain control module of the high anti-interference dual-channel multimode broadband radio frequency receiver sends a first control instruction to adjust the amplification factor of the intermediate frequency filter module and sends a second control instruction to adjust the amplification factor of the gain amplifier module by judging the amplitude of an output signal (digital signal), so that the high anti-interference dual-channel multimode broadband radio frequency receiver can ensure fixed output amplitude no matter the strength of an input signal, and the anti-interference performance of the system is improved;
(3) the high anti-interference dual-channel multimode broadband radio frequency receiver adopts the 10-bit analog-to-digital conversion ADC module, not only realizes a larger dynamic range and greatly reduces the amplification factor of the front-end module, but also can convert an analog signal into a digital signal for output, and simultaneously reduces the system power consumption and improves the anti-interference performance;
(4) the two receiving channels and the SPI interface module can simultaneously receive navigation satellite signals with the same or different frequency bands, and each receiving channel can receive the navigation satellite signals in multiple modes, so that the position information can be accurately positioned, and the positioning accuracy of the system is improved;
(5) the frequency range of the high-anti-interference dual-channel multimode broadband radio frequency receiver can support almost all navigation positioning system frequency bands, and a system low-pass mode and a system band-pass mode are supported to receive navigation satellite signals, so that the flexibility is improved;
(6) the high-anti-interference dual-channel multimode broadband radio frequency receiver has the advantages of low power consumption, high anti-interference performance and high integration level, and is particularly suitable for scenes with high anti-interference requirements and low-voltage work.
Drawings
Fig. 1 shows a schematic structural diagram of a high interference rejection dual-channel multimode wideband radio frequency receiver for a navigation system according to the present invention.
Fig. 2 is a schematic structural diagram of the high interference rejection dual-channel multimode wideband rf receiver for a navigation system according to the present invention.
Fig. 3 is a diagram showing simulation results of reflection coefficients of the high interference rejection dual-channel multimode wideband rf receiver according to an embodiment of the present invention.
Fig. 4 is a diagram showing simulation results of noise figure of the high anti-interference dual-channel multimode wideband rf receiver according to the embodiment of the present invention.
Fig. 5 is a simulation schematic diagram of the working process of the high interference rejection dual-channel multimode wideband radio frequency receiver according to the embodiment of the present invention.
Description of the element reference numerals
10 broadband radio frequency front end module
101 broadband low noise amplifier unit
102 passive quadrature mixer cell
103 transimpedance amplifier unit
20 intermediate frequency filter module
201 capacitor array
202. 202, 204 resistor array
30 gain amplifier module
301. 302 resistor array
40 local oscillator module
5010 bit analog-to-digital conversion ADC module
60 automatic gain control module
70 SPI interface module
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1-5. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
FIG. 1 is a schematic diagram of a high anti-interference dual-channel multimode broadband radio frequency receiver of the navigation system of the present invention; the technical idea of the present invention is described below with reference to fig. 1; the invention provides a high anti-interference dual-channel multimode broadband radio frequency receiver for a navigation system, which comprises an SPI interface module 70 and two receiving channels, wherein each receiving channel comprises a broadband radio frequency front-end module 10, a local oscillator module 40, an intermediate frequency filter module 20, a gain amplifier module 30, an automatic gain amplification module 60 and a 10-bit analog-to-digital conversion (ADC) module 50;
the local oscillator module 40 is configured to generate a local oscillator signal required by the high anti-interference dual-channel multimode wideband radio frequency receiver;
the radio frequency input end of the broadband radio frequency front end module 10 receives navigation satellite signals of multiple frequency bands and multiple modes at the same time, and the local oscillator input end of the broadband radio frequency front end module 10 is connected with the output end of the local oscillator module 40; the broadband radio frequency front-end module has the characteristics of high integration level and low power consumption and is used for obtaining a differential intermediate frequency signal according to the navigation satellite signal and the local oscillator signal in a frequency conversion mode; the navigation satellite signal is a single-ended radio frequency voltage signal;
the input end of the intermediate frequency filter module 20 is connected to the output end of the wideband radio frequency front end module 10, and the control end of the intermediate frequency filter module 20 is connected to the output end of the automatic gain control module 60; the automatic gain control module 60 is configured to perform amplification processing and filtering processing on the differential intermediate frequency signal according to a first control instruction of the automatic gain control module to obtain a first analog signal; the intermediate frequency filter module can support switching between a low-pass mode and a band-pass mode;
the input end of the gain amplifier module 30 is connected to the output end of the if filter module 20, and the control end of the gain amplifier module 30 is connected to the output end of the agc module 60; the second analog signal processing module is configured to amplify the first analog signal according to a second control instruction of the automatic gain control module 60 to obtain a second analog signal;
the input end of the 10-bit analog-to-digital conversion ADC module 50 is connected to the output end of the gain amplifier module 30, and is configured to convert the second analog signal into an output digital signal;
the input end of the automatic gain control module 60 is connected to the output end of the analog-to-digital conversion module, and generates the first control instruction and the second control instruction according to the amplitude of the digital signal; the intermediate frequency filter module is controlled through a first control instruction, and the gain amplifier module is controlled through a second control instruction, so that the high-anti-interference dual-channel multimode broadband radio frequency receiver can ensure fixed amplitude output regardless of the strength of an input signal at the radio frequency input end;
the SPI interface module 70 is used to send and receive control signals;
the two receiving channels of the high anti-interference dual-channel multimode broadband radio frequency receiver for the navigation system can simultaneously receive navigation satellite signals of the same or different frequency bands, and each receiving channel can simultaneously receive navigation satellite signals of multiple modes, so that accurate position information is positioned.
In the embodiment of the invention, the frequency range of the high-anti-interference dual-channel multimode broadband radio frequency receiver supports almost all navigation positioning system frequency bands, and the frequency band is specifically 1.15 GHz-1.65 GHz.
The high anti-interference dual-channel multimode broadband radio frequency receiver for the navigation system can simultaneously receive navigation satellite signals of the same or different frequency bands through the two receiving channels, each receiving channel can receive the navigation satellite signals of multiple modes, and the output digital signals can be ensured to have fixed amplitude through the first control instruction and the second control instruction of the automatic gain control module 60, so that the position information can be accurately positioned.
Fig. 2 is a schematic structural diagram of the high interference rejection dual-channel multimode wideband rf receiver for a navigation system according to the present invention, and the technical details of the technical solution of the present invention are described in more detail below with reference to fig. 2.
In the embodiment of the present invention, the local oscillator module 40 is used for generating local oscillator signals required by the high anti-interference dual-channel multimode broadband radio frequency receiver, and there are many structures capable of generating local oscillator signals in the prior art.
In this embodiment of the present invention, the wideband radio frequency front end module 10 includes a wideband low noise amplifier unit 101, a passive quadrature mixer unit 102, and a transimpedance amplifier unit 103;
the input end of the broadband low-noise amplifier unit 101 is connected to the single-ended radio frequency voltage signal, and is configured to implement broadband impedance matching and amplify and convert the single-ended radio frequency signal into two paths of differential radio frequency current signals;
a radio frequency input end of the passive quadrature mixer unit 102 is connected to an output end of the wideband low noise amplifier unit 101, and a local oscillator input end of the passive quadrature mixer unit 102 is connected to the local oscillator module 40; the local oscillator signal is used for obtaining two paths of differential intermediate frequency current signals according to the differential radio frequency current signals and the local oscillator signal;
the input end of the transimpedance amplifier is connected to the output end of the passive quadrature mixer unit 102, and the output end of the transimpedance amplifier unit 103 is connected to the input end of the intermediate frequency filter module 20; the circuit is used for converting each path of differential intermediate frequency current signal into a differential intermediate frequency voltage signal.
Specifically, the passive quadrature mixer unit 102 adopts a complementary passive switch structure of NMOS transistors and PMOS transistors, and each NMOS transistor is respectively connected to two paths of differential radio frequency current signals output by the wideband low noise amplifier unit 101; the grid electrode of the NMOS tube and the grid electrode of the PMOS tube are respectively connected with local oscillator signals output by the local oscillator module 40; the NMOS transistor and the PMOS transistor of the passive quadrature mixer unit 102 respectively output one path of differential intermediate-frequency current signal, for example, the NMOS transistor outputs an I path signal (differential intermediate-frequency current signal), the PMOS transistor outputs a Q path signal (differential intermediate-frequency current signal), or the NMOS transistor outputs a Q path signal (differential intermediate-frequency current signal), the PMOS transistor outputs an I path signal (differential intermediate-frequency current signal); the input end of the transimpedance amplifier unit 103 is connected to two paths of differential intermediate-frequency current signals, and outputs two paths of differential intermediate-frequency voltage signals (an intermediate-frequency I path signal and an intermediate-frequency Q path signal described in fig. 2), that is, the process of obtaining the differential intermediate-frequency voltage signal according to the conversion output of the single-ended radio-frequency voltage signal and the local oscillator signal is completed.
Therefore, the wideband radio frequency front-end module 10 of the present invention first amplifies the single-ended radio frequency voltage signal by the wideband low-noise amplifier unit 101 to convert the single-ended radio frequency voltage signal into the differential radio frequency current signal, and the wideband noise amplifier unit 101 is adopted to realize wideband impedance matching; then, the unit converts the differential radio frequency current signal into a differential intermediate frequency current signal based on the local oscillator signal in a high-linearity way, and because the NMOS tube and the PMOS tube adopted by the passive quadrature mixer unit 102 are output with a ground capacitor, the ground capacitor can be used for filtering the high-frequency signal, so that the suppression of an interference signal is realized; and finally, the trans-impedance amplifier outputs the differential intermediate frequency current signal to be converted into a differential intermediate frequency voltage signal, further amplifies and filters the differential intermediate frequency voltage signal, and simultaneously meets the requirement of low noise.
In the embodiment of the present invention, the intermediate frequency filter module 20 adopts an RC type structure; the RC type structure includes a capacitor array 201 and a resistor array; in the invention, the RC type structure adopts a four-step cascade structure, so the resistor array specifically comprises a resistor array 202, a resistor array 203 and a resistor array 204, two groups of the capacitor array 210 and the resistor array 202 are respectively provided, the resistor array 203 and the resistor array 204 are positioned between the capacitor array 201 and the resistor array 202, that is, the capacitor array 201 and the resistor array 202 are respectively arranged on two sides of the resistor array 203 and the resistor array 204. The capacitor array 201 and the resistor array 202 select corresponding bandwidths and gains according to requirements, that is, flexible conversion of a plurality of bandwidths and adjustment of amplification factors are mainly realized, and the resistor array 203 and the resistor array 204 flexibly select appropriate intermediate frequencies according to actual conditions to realize switching between zero intermediate frequency and low intermediate frequency; the intermediate frequency filter module 20 of the invention can realize filtering and amplifying the differential intermediate frequency voltage signal output by the broadband radio frequency front end module 10 by adopting an RC type structure, so as to facilitate subsequent processing.
The intermediate frequency filter module 20 of the present invention adopts an RC type structure, which can realize amplification and filtering of multiple bandwidths and multiple intermediate frequencies, and supports switching between a low-pass mode and a band-pass mode, thereby satisfying the requirements of multiple modes and multiple frequencies.
In the embodiment of the present invention, all control interfaces of the if filter module 20 support SPI control, which is convenient for flexibly implementing the requirements of multimode, multiband, lowpass and bandpass modes.
The if filter module 20 performs the adjusting and amplifying process on the differential if signal according to the first control instruction of the agc module 60, including: adjusting the amplification factor of the if filter module 20 according to the first control instruction of the agc module 60; and amplifying the differential intermediate frequency signal according to the adjusted amplification factor of the intermediate frequency filter.
Based on the SPI control of the SPI interface module 70, the present invention sends the first control command output by the automatic gain control module 60 to the intermediate frequency filter module 20, and the intermediate frequency filter module 20 adjusts the amplification factor of the intermediate frequency filter module 20 according to the first control command of the automatic gain control module 60, and then amplifies the differential intermediate frequency signal according to the adjusted amplification factor of the intermediate frequency filter module 20, that is, adjusts the resistor array 202 in the intermediate frequency filter module 20 through the amplification control path to reduce the signal amplification factor, thereby outputting the first analog signal.
In the embodiment of the present invention, the gain amplifier module 30 amplifies the first analog signal output by the intermediate frequency filter, and the gain amplifier module 30 includes a resistor array 301 and a resistor array 302, and amplifies the first analog signal through the resistor array 301 and the resistor array 302; meanwhile, the control interface of the gain amplifier module 30 supports SPI control, and the adjusting and amplifying process of the first analog signal according to the second control instruction of the automatic gain control module 60 includes: adjusting the amplification factor of the gain amplifier module 30 according to a second control instruction of the automatic gain control module 60; amplifying the first analog signal according to the adjusted amplification factor of the gain amplification control module; the high anti-interference dual-channel multimode broadband radio frequency receiver is used for calculating the amplitude of the output signal of the high anti-interference dual-channel multimode broadband radio frequency receiver, judging whether the amplitude requirement of the navigation system signal processing is met or not, and then adjusting the amplification factor of the intermediate frequency filter module and the amplification factor of the gain amplifier module according to the generated first control signal and the second control signal until the amplitude of the output signal of the high anti-interference dual-channel multimode broadband radio frequency receiver meets the requirement.
Based on the SPI control of the SPI interface module 70, the present invention sends the second control instruction output by the automatic gain control module 60 to the gain amplifier module 30, and the gain amplifier module 30 adjusts the amplification factor of the gain amplifier module 30 according to the second control instruction of the automatic gain control module 60, and then amplifies the first analog signal according to the adjusted amplification factor of the gain amplifier module 30, that is, adjusts the resistor array 301 and the resistor array 302 in the gain amplifier module 30 through the amplification control path to further reduce the signal amplification factor and IQ mismatch error, thereby outputting the second analog signal.
In the embodiment of the present invention, the 10-bit analog-to-digital conversion ADC module 50 adopts a low power consumption SAR-ADC architecture (successive approximation type), an analog input end of the SAR-ADC architecture is connected to an output end of the gain amplifier module 30, and a digital output end of the SAR-ADC architecture is connected to an input end of the automatic gain control module 60; the digital output end of the SAR-ADC framework comprises an I-path signal output interface and a Q-path signal output interface, and the I-path signal output interface or the Q-path signal output interface is configured for the output selection of the digital signal.
And under the action of the SAR-ADC framework, converting the second analog signal into a digital signal for outputting, and selecting reasonable configuration according to requirements when the digital signal is output, namely selecting and configuring an I-path signal output interface or a Q-path signal output interface reasonably for outputting the digital signal. Specifically, according to the requirements of dual-channel multi-mode broadband radio frequency and different bandwidths and intermediate frequencies, various sampling clock signals can be supported, the maximum frequency reaches 100MHz, an I-path signal output interface and a Q-path signal output interface are provided, the amplification factor of a broadband radio frequency front-end module can be greatly reduced, and therefore the power consumption and the size of a system are reduced.
The 10-bit analog-to-digital conversion ADC module 50 of the invention adopts a low-power-consumption SAR-ADC structure to realize the requirement of 10-bit resolution, is used for realizing the adjustment of a larger dynamic range, reducing the amplification factor of a differential intermediate-frequency voltage signal output by a broadband radio frequency front-end module, converting a second analog signal obtained by performing amplification processing and filtering processing on the differential intermediate-frequency voltage signal into a digital signal and outputting the digital signal, and improves the anti-interference performance of a system.
In the embodiment of the present invention, the automatic gain control module 60 generates a first control command and a second control command according to the magnitude of the digital signal; the digital signal is an output signal of the high-anti-interference dual-channel multimode broadband radio frequency receiver.
The agc module 60 compares the magnitude of the digital signal with a set value to obtain a determination result, and then generates a first control command for adjusting the if filter module 20 and a second control command for adjusting the gain amplifier module 30 according to the determination result, wherein the set value is set according to the magnitude requirement of the system signal processing.
Specifically, firstly, the automatic gain control module 60 determines, in a digital manner, whether the amplitude of the output signal of the high-interference-resistance dual-channel multimode wideband radio frequency receiver meets the amplitude requirement of system processing or not for the amplitude of the digital signal output by the 10-bit analog-to-digital conversion ADC module 50, and may also compare the amplitudes of the I-path output signal and the Q-path output signal; then, the agc module 60 generates and outputs a first control command with a first amplification factor to the if filter module 20, and a second control command with a second amplification factor and an IQ mismatch control signal to the gain amplifier module; furthermore, the resistor array 202 of the if filter module 20 is adjusted through the amplification control path according to the first amplification factor in the first control instruction to reduce the amplification factor of the differential if voltage signal, and a first analog signal is output; adjusting the resistor array 301 and the resistor array 302 of the gain amplifier module through a control loop according to a second amplification factor and an IQ mismatch control signal in a second control instruction, so as to further reduce the amplification factor and the IQ mismatch error of the first analog signal and output a second analog signal; finally, the 10-bit ADC module 50 converts the second analog signal to output an updated digital signal, and the agc module 60 determines whether the signal amplitude of the updated digital signal meets the requirement, and adjusts the signal amplitude until the output signal of the high-interference-resistance dual-channel multimode wideband rf receiver meets the requirement.
As a better implementation manner, in order to prevent the influence of the burst signal and other interference signals, the automatic gain control module further includes a hysteresis window, and the added hysteresis window can avoid the system from having problems, thereby improving the system stability.
The gain amplification processing of the invention is closed-loop control, so that the amplification times of the intermediate frequency filter module and the gain amplifier module can be continuously adjusted under the regulation and control of the automatic gain control module until the amplitude of the output signal (digital signal) of the high anti-interference dual-channel multimode broadband radio frequency receiver meets the requirement.
In the embodiment of the present invention, the SPI interface module 70 is related to the control interface of the high-interference-resistance dual-channel multimode wideband radio frequency receiver, and supports the peripheral interface to perform read-write signal control, thereby improving the flexibility of the system. The high-anti-interference dual-channel multimode broadband radio frequency receiver has the advantages of low power consumption, high anti-interference performance and high integration level, and is particularly suitable for scenes with high anti-interference requirements and low-voltage work.
The application example is as follows:
in the present embodiment, the latest GNSS navigation satellite systems GPS L1 and L5 frequency bands are taken as examples. According to the regulation, the radio frequency of the GPS L1 is 1575.42MHz, and the signal bandwidth is 2.046 MHz; the radio frequency of the GPS L5 is 1176.45MHz, and the signal bandwidth is 20.46 MHz. In order to realize high-performance and high-precision satellite positioning, the high-interference-resistance dual-channel multi-mode radio frequency receiver needs to receive satellite signals of the two modes at the same time. Therefore, the design indexes of the operating frequency range of the high-anti-interference dual-channel multimode broadband radio frequency receiver are that the operating frequency range covers 500MHz in the range of 1.15 GHz-1.65 GHz, the maximum bandwidth of a single side band is 3dB and is 30MHz, and useful signal signals are prevented from being influenced. Because the satellite signal is very weak when reaching the ground, the high-anti-interference dual-channel multimode broadband radio frequency receiver needs to meet the requirements of low noise and anti-interference.
In order to better receive satellite signals, the front end of the high-interference-resistance dual-channel multimode broadband radio frequency receiver is in impedance matching with an antenna port, and the reflection coefficient S11 is smaller than-10 dB in a useful frequency band generally. Meanwhile, considering the low power consumption and small volume requirement of the system, the system noise figure nf (noise figure) is required to be less than 2 dB. However, it is very difficult to improve the noise coefficient in a large bandwidth range at present, and the high-interference-resistance dual-channel multi-mode wideband radio frequency receiver needs to realize a better noise coefficient in a low-pass receiving mode, which further increases the difficulty of realization. The main reasons are that the flicker noise 1/f noise contribution of the low-frequency-band circuit device is large, the high-frequency-band thermal noise contribution is large, and the high-anti-interference dual-channel multi-mode broadband radio frequency receiver needs to have a good noise coefficient from low frequency to high frequency. The broadband radio frequency front-end module contributes the largest noise to the whole high-anti-interference dual-channel multi-mode broadband radio frequency receiver, and the intermediate frequency filter module has more bandwidth and mode switching control.
In order to meet the requirement that the high-interference-resistance dual-channel multimode broadband radio frequency receiver receives signals under the conditions of low noise and low-pass mode bandwidth of 30MHz, a broadband radio frequency front-end module and an intermediate frequency filter module are particularly critical. Meanwhile, in order to avoid the influence of external interference signals on weak satellite signals, it is also important that the 10-bit analog-to-digital conversion ADC module realizes large dynamic range signal processing and the automatic gain control module flexibly adjusts the amplification factor performance.
The high-anti-interference dual-channel multimode broadband radio frequency receiver utilizes Cadence software to carry out simulation and verification based on a GF latest FDSOI 22nm process, the low-voltage power supply of a main module is 0.8V, and the results of a system reflection coefficient S11 and a noise coefficient NF are respectively shown in fig. 3 and fig. 4. According to simulation results, the reflection coefficient S11 of the high-anti-interference dual-channel multimode broadband radio frequency receiver is less than-10 dB in the range of 1.15 GHz-1.65 GHz of the frequency band of the navigation positioning system; at a satellite signal bandwidth of 20.46MHz, even a maximum bandwidth of 30MHz, the system noise factor NF meets the index requirements, and the system noise factor NF is less than 2dB in the range of 150 KHz-30 MHz as shown in FIG. 4. Therefore, the high-anti-interference dual-channel multimode broadband radio frequency receiver not only realizes broadband impedance matching, but also realizes low noise coefficient in a large bandwidth range, and meets the system requirements. Compared with other satellite system receivers, the high-anti-interference dual-channel multimode broadband radio frequency receiver disclosed by the invention not only realizes low noise and low power consumption under the condition of low voltage, but also avoids using an off-chip balun and an on-chip inductor, and greatly reduces the size of a chip.
The high-anti-interference dual-channel multimode broadband radio frequency receiver ensures the fixed signal output and the capability of the 10-bit analog-to-digital conversion ADC module 50 for realizing the large dynamic range signal processing by analyzing and verifying the automatic gain control module, and is used for reflecting the anti-interference performance of the system. Although the 10-bit analog-to-digital conversion ADC module 50 supports the highest 10-bit resolution, its dynamic range is approximately 54dB, taking into account other non-linear factors. In order to display the satellite signal receiving condition under the condition of the maximum signal bandwidth of the high-interference-resistance dual-channel multimode broadband radio frequency receiver as much as possible, a GNSS navigation satellite system GPS L5 is adopted for verification, the radio frequency is 1176.45MHz, and the signal bandwidth is 20.46 MHz. In consideration of the convenience in analyzing the signal detection range, the radio frequency of the high-anti-interference dual-channel multi-mode broadband radio frequency receiver is 1176.45MHz, the signal amplitude is-90 dBm, the link gain of the high-anti-interference dual-channel multi-mode broadband radio frequency receiver is 90dB, the local oscillator module provides the local oscillator signal with the frequency of 1162.128MHz, and the clock signal frequency of the 10-bit analog-to-digital conversion ADC module is 98.208MHz, so that the intermediate frequency is 14.322MHz, and the signal output amplitude is-10 dBm. Meanwhile, considering the convenience of analyzing signal adjustment changes, the input signal amplitudes are respectively-90 dBm and-80 dBm, wherein the power of the front 2uS input signal is-90 dBm, the power of the input signal is changed to-80 dBm after 2uS, and whether the output amplitudes of the analysis signals are all-10 dBm or not is judged.
The transient simulation analysis and verification of the high anti-interference dual-channel multimode broadband radio frequency receiver is shown in figure 5. Wherein, the upper half of fig. 5 shows the variation of the rf single-ended input signal, the middle part of fig. 5 shows the analog if differential output signal, and the lower half of fig. 5 shows the digital if differential output signal. From the upper part of fig. 5, it is shown that the amplitude of the rf single-ended input signal changes significantly around 2us, and although the rf frequency is too fast, the amplitude difference is clear. The automatic gain control module calculates the output amplitude of the 10-bit analog-to-digital conversion ADC module based on a digital mode, and further judges whether the output amplitude meets the amplitude requirement of system signal processing; a first amplification control signal is then generated and sent to the if filter module, and a second amplification control signal is generated and sent to the gain amplifier module 30. In this way, the adjustment is made until the amplitude of the output signal varies less before and after 2uS, as in the middle part of fig. 5, where weak jitter is a normal phenomenon. Meanwhile, the lower half of fig. 5 shows that the 10-bit ADC module 50 can detect a signal with a processed signal amplitude of-10 dBm, or even lower. Of course, fig. 5 is only a simple description of the working process of the high anti-interference dual-channel multimode broadband radio frequency receiver of the present invention, and the actual circuit can more accurately complete the satellite signal processing. Therefore, the high-anti-interference dual-channel multimode broadband radio frequency receiver not only can simultaneously receive multiple mode signals to achieve accurate positioning position information, but also has the advantages of low power consumption, high anti-interference performance and high integration level, and is particularly suitable for scenes with high anti-interference requirements and low-voltage work. And all other control signals are controlled by the SPI, so that the flexibility of the system is further improved.
In conclusion, the high-anti-interference dual-channel multimode broadband radio frequency receiver adopts a broadband receiving architecture, not only can realize broadband impedance matching and signal amplification, but also can realize high-linearity orthogonal frequency conversion, simultaneously converts a single-end signal into a differential signal under the condition of avoiding out-of-chip balun and in-chip balun, and realizes low power consumption, low noise and high integration degree; the 10-bit analog-to-digital conversion ADC module can be adopted, so that the amplification factor of the front-end module is greatly reduced in a large dynamic range, an analog signal can be converted into a digital signal to be output, the power consumption and the volume of a system are reduced, and the anti-interference performance of the system is improved; the automatic gain control module can be used for sending a control signal to adjust the amplification times of the intermediate frequency filter module and the gain amplifier module by judging the amplitude of the output signal, so that the fixed signal amplitude output can be ensured no matter the strength of the input signal, and the anti-interference performance of the system is further improved; the two channels can simultaneously receive signals of the same frequency band or different frequency bands, and each channel can simultaneously receive navigation satellite signals of multiple modes, so that the positioning accuracy of the system is improved; the satellite signal is received in a low-pass mode and a band-pass mode, and the requirements of low voltage and low power consumption of a system are met. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A high anti-interference dual-channel multimode broadband radio frequency receiver for a navigation system is characterized by comprising an SPI interface module and two receiving channels, wherein each receiving channel comprises a broadband radio frequency front-end module, a local oscillator module, an intermediate frequency filter module, a gain amplifier module, an automatic gain amplification module and a 10bit analog-to-digital conversion module;
the local oscillator module is used for generating local oscillator signals required by the high anti-interference multimode broadband radio frequency receiver;
the radio frequency input end of the broadband radio frequency front-end module receives navigation satellite signals of multiple frequency bands and multiple modes at the same time, and the local oscillator input end of the broadband radio frequency front-end module is connected with the output end of the local oscillator module; the broadband radio frequency front-end module has the characteristics of high integration level and low power consumption and is used for obtaining a differential intermediate frequency voltage signal according to the navigation satellite signal and the local oscillator signal in a frequency conversion mode; the navigation satellite signal is a single-ended radio frequency voltage signal;
the input end of the intermediate frequency filter module is connected with the output end of the broadband radio frequency front end module, and the control end of the intermediate frequency filter module is connected with the output end of the automatic gain control module; the automatic gain control module is used for amplifying and filtering the differential intermediate frequency signal according to a first control instruction of the automatic gain control module to obtain a first analog signal; the intermediate frequency filter module can support switching between a low-pass mode and a band-pass mode;
the input end of the gain amplifier module is connected with the output end of the intermediate frequency filter module, and the control end of the gain amplifier module is connected with the output end of the automatic gain control module; the first analog signal is amplified according to a second control instruction of the automatic gain control module to obtain a second analog signal;
the input end of the 10-bit analog-to-digital conversion module is connected with the output end of the gain amplifier module and is used for converting the second analog signal into an output digital signal;
the input end of the automatic gain control module is connected with the output end of the analog-to-digital conversion module, the first control instruction and the second control instruction are generated according to the amplitude of the digital signal, the intermediate frequency filter module is controlled through the first control instruction, and the gain amplifier module is controlled through the second control instruction, so that the high-anti-interference dual-channel broadband radio frequency receiver can ensure fixed amplitude output regardless of the strength of an input signal at the radio frequency input end;
the SPI interface module is used for sending and receiving control signals;
the two receiving channels of the high anti-interference dual-channel multimode broadband radio frequency receiver for the navigation system can simultaneously receive navigation satellite signals of the same or different frequency bands, and each receiving channel can simultaneously receive navigation satellite signals of multiple modes, so that accurate position information is positioned.
2. The high interference rejection dual channel multimode wideband radio frequency receiver for a navigation system according to claim 1, wherein said first control command and second control command are generated according to said automatic gain control module; the first control instruction adjusts the amplification factor of the intermediate frequency filter module, and the differential intermediate frequency signal is amplified according to the adjusted amplification factor of the intermediate frequency filter; the second control instruction adjusts the amplification factor of the gain amplifier module, and the first analog signal is amplified according to the adjusted amplification factor of the gain amplification control module; the high anti-interference dual-channel multimode broadband radio frequency receiver is used for calculating the amplitude of the output signal of the high anti-interference dual-channel multimode broadband radio frequency receiver, judging whether the amplitude requirement of the navigation system signal processing is met or not, and then adjusting the amplification factor of the intermediate frequency filter module and the amplification factor of the gain amplifier module according to the generated first control signal and the second control signal until the amplitude of the output signal of the high anti-interference dual-channel multimode broadband radio frequency receiver meets the requirement.
3. The high immunity dual channel multimode wideband radio frequency receiver for navigation system of claim 1, wherein the wideband radio frequency front end module comprises a wideband low noise amplifier unit, a passive quadrature mixer unit and a transimpedance amplifier unit;
the input end of the broadband low-noise amplifier unit is connected with the single-ended radio frequency voltage signal and is used for realizing broadband impedance matching and amplifying and converting the single-ended radio frequency signal into two paths of differential radio frequency current signals;
the radio frequency input end of the passive quadrature mixer unit is connected with the output end of the broadband low-noise amplifier unit, the local oscillator input end of the passive quadrature mixer unit is connected with the local oscillator module, and the passive quadrature mixer unit adopts a complementary passive switch structure of an NMOS (N-channel metal oxide semiconductor) tube and a PMOS (P-channel metal oxide semiconductor) tube and is used for obtaining two paths of differential intermediate-frequency current signals according to the differential radio-frequency current signals and the local oscillator signals and outputting signals with a ground capacitor capable of further filtering high-frequency signals;
the input end of the transimpedance amplifier is connected with the output end of the passive quadrature mixer unit, and the output end of the transimpedance amplifier is connected with the input end of the intermediate frequency filter module; and the differential intermediate-frequency current signal processing module is used for converting each path of differential intermediate-frequency current signal into a differential intermediate-frequency voltage signal and further amplifying and filtering the navigation satellite signal.
4. The high interference rejection dual channel multimode wideband radio frequency receiver for a navigation system as claimed in claim 1, wherein said if filter module is of RC type structure including capacitor array and resistor array for meeting the requirement of multi-mode multi-frequency of the system.
5. The high-interference-resistance dual-channel multimode broadband radio frequency receiver for the navigation system according to claim 1, wherein the 10-bit analog-to-digital conversion ADC module adopts a SAR-ADC architecture, an analog input end of the SAR-ADC architecture is connected with an output end of the gain amplifier module, and a digital output end of the SAR-ADC architecture is connected with an input end of the automatic gain control module; the method is used for realizing adjustment of a large dynamic range, reducing the amplification factor of the broadband radio frequency front-end module and improving the anti-interference performance of the navigation system.
6. The high interference rejection dual channel multimode wideband radio frequency receiver for a navigation system as claimed in claim 8, wherein the digital output terminal of the SAR-ADC architecture includes an I-path signal output interface and a Q-path signal output interface, and is configured to select either the I-path signal output interface or the Q-path signal output interface for the output of the digital signal.
7. The high immunity dual channel multimode broadband radio frequency receiver for navigation system of claim 1, wherein the frequency range of the high immunity dual channel multimode broadband radio frequency receiver is: 1.15 GHz-1.65 GHz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115865116A (en) * | 2022-10-12 | 2023-03-28 | 航天科工深圳（集团）有限公司 | Domestic unmanned equipment comprehensive communication integrated system and equipment |
| CN115987309A (en) * | 2023-03-15 | 2023-04-18 | 湖南卫导信息科技有限公司 | Noncoherent multipath interference signal simulator and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115865116A (en) * | 2022-10-12 | 2023-03-28 | 航天科工深圳（集团）有限公司 | Domestic unmanned equipment comprehensive communication integrated system and equipment |
| CN115865116B (en) * | 2022-10-12 | 2024-03-19 | 航天科工深圳（集团）有限公司 | Unmanned equipment comprehensive lead integrated system and equipment |
| CN115987309A (en) * | 2023-03-15 | 2023-04-18 | 湖南卫导信息科技有限公司 | Noncoherent multipath interference signal simulator and method |
| CN115987309B (en) * | 2023-03-15 | 2023-06-20 | 湖南卫导信息科技有限公司 | Incoherent multipath interference signal simulator and method |
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