CN109600143B - 30 MHz-2 GHz multi-channel wide-band universal comprehensive radio frequency module - Google Patents
30 MHz-2 GHz multi-channel wide-band universal comprehensive radio frequency module Download PDFInfo
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- CN109600143B CN109600143B CN201811214751.8A CN201811214751A CN109600143B CN 109600143 B CN109600143 B CN 109600143B CN 201811214751 A CN201811214751 A CN 201811214751A CN 109600143 B CN109600143 B CN 109600143B
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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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/0017—Digital filtering
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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Abstract
The invention discloses a 30 MHz-2 GHz multi-channel wide-band generalized comprehensive radio frequency module, which comprises an analog transmitting channel, a local oscillator unit and a digital signal processing unit, wherein the digital signal processing unit is used for outputting a 70MHz intermediate frequency signal to the analog transmitting channel; the local oscillation unit generates 3 fixed local oscillations and 5 transmitting variable local oscillations; the analog transmitting channel mixes the 70MHz intermediate frequency signal with one of 3 fixed local oscillators to output a 400MHz or 800MHz or 1200MHz high intermediate frequency signal; then the mixed signal is mixed with one of 5 transmitting variable local oscillators for the second time to obtain a radio frequency signal of 30MHz to 2000 MHz. The invention can meet the radio frequency comprehensive requirement of various sensors of an airborne avionic system.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a radio frequency circuit technology and a digital signal processing technology.
Background
With the development of highly integrated architectures for avionics systems, the integration of radio frequency functions has been put into practice. Many rf sensor functions are eliminated from hardware configurations, and in such systems, various functions are implemented in multiple shared resource modules, again without separating the boundaries of conventional subsystems. The acquisition of various functions is completely realized by loading different software, and the avionics system is transited from the traditional longitudinal function division to the concept of transverse function division. The functional partitions are parts with similar functional characteristics and close task association in the whole system, can realize resource sharing in the same functional area, and are easy to realize dynamic reconstruction and fault tolerance by mutual redundancy. Avionics systems integration advances from displays to data processing and to integration of radio frequency sensor systems.
The 30 MHz-2 GHz multi-channel wide-band generalized integrated radio frequency module realizes the integration of various radio frequency sensor subsystems in an avionics system into 30 MHz-2 GHz wide-band radio frequency, provides a multi-mode, wide-band, multifunctional and software-configurable radio frequency integrated solution, and can well meet the integrated requirements of various airborne avionic radio frequency sensors.
For the reasons, the development of a 30 MHz-2 GHz multi-channel wide-band universal comprehensive radio frequency module is required.
Disclosure of Invention
The invention aims to provide a 30 MHz-2 GHz multi-channel wide-band generalized comprehensive radio frequency module which is used for meeting the radio frequency comprehensive requirements of various sensors of an airborne avionic system.
The invention aims to be realized by the following technical scheme:
a30 MHz-2 GHz multichannel wide band generalized integrated radio frequency module comprises an analog transmitting channel, a local oscillator unit and a digital signal processing unit;
the digital signal processing unit comprises a sending end signal processing module, and the sending end signal processing module is used for outputting a 70MHz intermediate frequency signal to an analog transmitting channel;
the local oscillation unit is used for generating a first fixed local oscillation, a second fixed local oscillation, a third fixed local oscillation, a first transmission variable local oscillation, a second transmission variable local oscillation, a third transmission variable local oscillation, a fourth transmission variable local oscillation and a fifth transmission variable local oscillation, wherein the step of the first transmission variable local oscillation, the second transmission variable local oscillation, the third transmission variable local oscillation, the fourth transmission variable local oscillation and the fifth transmission variable local oscillation is 1 KHz;
the analog transmitting channel sequentially comprises a first transmitting frequency mixing module, a second transmitting frequency mixing module and a transmitting electric tuning filter bank module; the first transmitting and frequency mixing module is used for mixing the 70MHz intermediate frequency signal with one of a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator according to different output frequencies and outputting a 400MHz or 800MHz or 1200MHz high and intermediate frequency signal; the second transmitting and frequency mixing module selects the high and medium frequency signals according to different output frequencies to perform second frequency mixing with one of a first transmitting variable local oscillator, a second transmitting variable local oscillator, a third transmitting variable local oscillator, a fourth transmitting variable local oscillator and a fifth transmitting variable local oscillator to obtain 30-2000 MHz radio frequency signals; the transmitting electric tuning filter bank module comprises seven filters with different frequency bands, and selects one filter for filtering and outputting 30 MHz-2000 MHz radio frequency signals according to output frequency.
Preferably, the first transmitting and mixing module sequentially comprises a filter, a first amplifier, a numerical control attenuator, a mixer, an attenuator, a second amplifier, a first third-to-one switch, a filter bank, a second third-to-one switch and a third amplifier, wherein the 70MHz intermediate frequency signal is firstly subjected to intermediate frequency filtering, amplification and numerical control attenuation through the filter, the first amplifier and the first numerical control attenuator, then the first mixer is subjected to frequency mixing with one of a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator according to different output frequencies, then the first attenuator and the second amplifier are subjected to attenuation matching and amplification, and finally the first third-to-one switch, the filter bank, the second third-to-one switch and the third amplifier are used for selecting the filter bank to filter and amplifying and outputting a 400MHz or 800MHz or 1200MHz high-intermediate frequency signal; the filter bank comprises three second filters, the central frequency points of the three second filters are 400MHz, 800MHz and 1200MHz respectively, and the bandwidths are 20MHz respectively.
Preferably, the second transmitting and frequency mixing module sequentially comprises a second frequency mixer, a second numerical control attenuator and a third amplifier, the second frequency mixer selects one of a first transmitting variable local oscillator, a second transmitting variable local oscillator, a third transmitting variable local oscillator, a fourth transmitting variable local oscillator and a fifth transmitting variable local oscillator according to different output frequencies to perform frequency mixing on the high and medium frequency signals, and then the second numerical control attenuator and the third amplifier perform attenuation and amplification to output 30 MHz-2000 MHz radio frequency signals.
Preferably, the sending end signal processing module sequentially includes an LVDS serial-to-parallel conversion module, an I, Q shunt mapping module, a shaping filter module, a sampling rate conversion module, a digital up-conversion module and a D/a module, an information sequence received from an LVDS port is firstly subjected to serial-to-parallel conversion by the LVDS serial-to-parallel conversion module, then is divided into two paths of signals I, Q by the I, Q shunt mapping module, and then is subjected to shaping filtering, sampling rate conversion and up-conversion by the shaping filter module, the sampling rate conversion module and the digital up-conversion module, so that various bandwidth selections of 3KHz to 20MHz are realized, and finally, digital-to-analog conversion and orthogonal modulation are completed by the D/a module and are sent to an analog transmission channel.
Further, the 30 MHz-2 GHz multi-channel wide-band generalized integrated radio frequency module also comprises an analog receiving channel;
the local oscillation unit is also used for generating a first receiving variable local oscillation, a second receiving variable local oscillation, a third receiving variable local oscillation, a fourth receiving variable local oscillation and a fifth receiving variable local oscillation;
the analog receiving channel sequentially comprises a receiving electric tuning filter bank module, a first receiving frequency mixing module and a second receiving frequency mixing module; the receiving electric tuning filter bank module comprises seven filters with different frequency bands, and the electric tuning filter bank module selects one filter for filtering the received 30 MHz-2000 MHz radio frequency signal according to the frequency band of the radio frequency signal; the first receiving frequency mixing module selects one of a first receiving variable local oscillator, a second receiving variable local oscillator, a third receiving variable local oscillator, a fourth receiving variable local oscillator and a fifth receiving variable local oscillator for frequency mixing according to the frequency band of the radio frequency signal, and outputs a high and medium frequency signal of 400MHz, 800MHz or 1200 MHz; the second receiving and frequency mixing module is used for selecting one of the first fixed local oscillator, the second fixed local oscillator and the third fixed local oscillator according to the frequency of the high and medium frequency signals to carry out second frequency mixing, and then down-converting the mixed frequency to an intermediate frequency signal of 70 MHz;
the digital signal processing unit also comprises a receiving end signal processing module, and the receiving end signal processing module is used for receiving the intermediate frequency signal of 70 MHz.
Preferably, the receiving electric tuning filter bank module further comprises a third digital control attenuator, an alternative switch, a 30 MHz-512 MHz filtering channel, a 500 MHz-2000 MHz filtering channel and a seven-alternative switch, wherein the received 30 MHz-2000 MHz radio frequency signal is firstly subjected to digital control attenuation through the digital control attenuator, then one of the 30 MHz-512 MHz filtering channel and the 500 MHz-2000 MHz filtering channel is selected for filtering by the alternative switch according to the frequency band of the radio frequency signal, and finally one filter is selected for filtering by the seven-alternative switch signal according to the frequency band of the radio frequency signal.
Preferably, the first-time reception frequency mixing module sequentially includes a fourth amplifier, a second attenuator, and a third mixer, the filtered radio frequency signal is amplified and attenuated in a matched manner by the fourth amplifier and the second attenuator, and then the third mixer selects one of the first reception variable local oscillator, the second reception variable local oscillator, the third reception variable local oscillator, the fourth reception variable local oscillator, and the fifth reception variable local oscillator according to the frequency band of the radio frequency signal to perform frequency mixing, and outputs a high-intermediate frequency signal of 400MHz, 800MHz, or 1200MHz after the frequency mixing.
Preferably, the second receiving and frequency mixing module sequentially includes a fifth amplifier, a third selective switch, a band-pass filter bank, a fourth third selective switch, a fourth digital controlled attenuator, a sixth amplifier, a fourth mixer, a third filter, a seventh amplifier, a fifth digital controlled attenuator, a fourth filter, an eighth amplifier, a first fifth selective switch, a fifth channel bandwidth, a second fifth selective switch, a ninth amplifier, a fifth filter, a sixth digital controlled attenuator, a tenth amplifier, and a sixth filter, wherein the high-medium frequency signal is amplified by the fifth amplifier, filtered by the third selective switch and the fourth selective switch according to the frequency of the high-medium frequency signal by selecting one band-pass filter from the band-pass filter bank, attenuated and amplified by the fourth digital controlled attenuator and the sixth amplifier, and then selected by the fourth mixer according to the frequency of the high-medium frequency signal and the first receiving fixed local oscillator, One of the second receiving fixed local oscillator and the third receiving fixed local oscillator carries out second frequency mixing, the mixed frequency is down-converted to an intermediate frequency signal of 70MHz, the intermediate frequency signal is filtered, amplified, filtered, numerically-controlled attenuated, filtered and amplified through a third filter, a seventh amplifier, a fifth numerically-controlled attenuator, a fourth filter and an eighth amplifier, one of five channel bandwidths is selected through a first five-out-of-one switch and a second five-out-of-one switch for filtering, and the intermediate frequency signal is amplified, filtered, numerically-controlled attenuated, amplified and filtered through a ninth amplifier, a fifth filter, a sixth numerically-controlled attenuator, a tenth amplifier and a sixth channel bandwidth filter and then is output to the intermediate frequency signal of 70 MHz; the band-pass filter group comprises three band-pass filters, the central frequency points of the three band-pass filters are 400MHz, 800MHz and 1200MHz respectively, and the channel bandwidths are a second-gear intermediate frequency wide bandwidth and a third-gear intermediate frequency narrow bandwidth respectively.
Preferably, the receiving end signal processing module includes an AD module, an orthogonal digital down-conversion module, a digital filtering module, a sampling rate conversion module, a matched filtering module, a digital AGC, and an LVDS parallel-to-serial conversion module, wherein the 70MHz intermediate frequency signal is first analog-to-digital converted by the AD module, then the orthogonal digital down-conversion module completes digital down-conversion, then is filtered, sample rate converted, matched filtered by the digital filtering module, the sampling rate conversion module, and the matched filtering module, then is digitally gained by the digital AGC, and finally is parallel-to-serial converted by the LVDS parallel-to-serial conversion module.
Preferably, the local oscillation unit generates a first fixed local oscillation, a second fixed local oscillation and a third fixed local oscillation by using a phase-locked loop of an integrated VCO, and the first fixed local oscillation, the second fixed local oscillation and the third fixed local oscillation are respectively divided into four parts and then output to two analog transmission channels and two analog reception channels through one-out-of-three switch gating;
the first emission variable local oscillator, the second emission variable local oscillator and the third emission variable local oscillator are generated by the DDS, the fourth emission variable local oscillator is generated by the first emission variable local oscillator after frequency multiplication for 2 times, and the fifth emission variable local oscillator is generated by the second emission variable local oscillator after frequency multiplication for 2 times;
the first receiving variable local oscillator, the second receiving variable local oscillator and the third receiving variable local oscillator are generated by the DDS, the fourth receiving variable local oscillator is generated by the first receiving variable local oscillator after frequency multiplication for 2 times, and the fifth receiving variable local oscillator is generated by the second receiving variable local oscillator after frequency multiplication for 2 times.
The invention has the beneficial effects that:
1. two transmitting channels with wide frequency ranges of 30MHz to 2GHz, rapid frequency hopping, multimode and adjustable output signal level of-30 dBm to 0dBm and two receiving channels with wide frequency ranges of 30MHz to 2GHz, rapid frequency hopping, multimode and a dynamic range of 110dB are realized, so that the use requirements of multi-channel receiving and transmitting and the use requirements of phases among multiple channels needing a synchronization function can be met;
2. the receiving and the transmitting of the radio frequency signals from the wide frequency band of 30MHz to 2GHz are realized, the receiving and the transmitting of the radio frequency signals from the working frequency band of dozens of megahertz to hundreds of megahertz are basically realized by the traditional radio frequency module, and the receiving and the transmitting of the near 2GHz working frequency band can be applicable to various frequency band waveforms of VHF wave band, UHF wave band and L wave band;
3. the signal bandwidths of various bandwidths of 3KHz-20MHz of the channel bandwidth can be configured, and the method is suitable for the configuration of waveforms with different bandwidths;
4. the frequency hopping speed of two transmitting channels and two receiving channels is more than 100000hop/s per second, and the application requirements of certain rapid frequency hopping waveform functions can be met;
5. the level of the radio frequency output signal can be adjusted within-30 dBm-0 dBm, the level error reaches +/-1 dB, the requirement that the radio frequency output level of the radio frequency signal is stable and adjustable within the frequency range of 30 MHz-2 GHz is met, the received signal can keep the linear amplification of a receiving channel within-110 dBm-0 dBm, namely within the dynamic range of 110dB, the signal is not distorted, and the requirements of certain functional waveforms requiring long communication distance and large radio wave fading are met.
Drawings
FIG. 1 is a simplified block diagram of a 30 MHz-2 GHz multi-channel wide-band generalized integrated RF module.
Fig. 2 is a schematic block diagram of a digital signal processing unit.
Fig. 3 is a schematic block diagram of a wide band multi-mode configurable analog transmit channel.
Fig. 4 is a schematic block diagram of a wide band multi-mode configurable analog receive channel.
Fig. 5 is a schematic block diagram of a local oscillation unit.
Fig. 6 is a block diagram of digital transmit-end signal processing.
Fig. 7 is a block diagram of signal processing at the digital receiving end.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the 30 MHz-2 GHz multi-channel wideband generalized integrated rf module shown in this embodiment is composed of 6 units, namely, 2 channels of wideband multi-mode configurable analog transmit channels, 2 channels of wideband multi-mode configurable analog receive channels, a local oscillator unit, and a digital signal processing unit.
(I) local oscillation unit
Referring to fig. 5, the local oscillation unit includes various local oscillations required for generating 2 analog transmission channels and various local oscillations required for 2 analog reception channels, wherein 3 fixed local oscillations need to be provided: the analog receiving method comprises the steps that after a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator are completed by a phase-locked loop of an integrated VCO, four power branches are respectively conducted, and the four power branches are output to an analog transmitting channel 1, an analog transmitting channel 2, an analog receiving channel 1 and an analog receiving channel 2 through gating of a three-out-of-one switch.
2 paths of transmitting variable local oscillators with the frequency of more than 100000 hops per second are required to be provided for analog transmitting channels 1 and 2, the transmitting variable local oscillators are composed of 5 sections in total, the transmitting variable local oscillators are respectively a first transmitting variable local oscillator, a second transmitting variable local oscillator, a third transmitting variable local oscillator, a fourth transmitting variable local oscillator and a fifth transmitting variable local oscillator, the steps of the first transmitting variable local oscillator, the second transmitting variable local oscillator and the third transmitting variable local oscillator are 1KHz, the first transmitting variable local oscillator, the second transmitting variable local oscillator and the third transmitting variable local oscillator are directly generated by a DDS, and then the DDS is filtered and output to the analog transmitting channels 1 and; the fourth transmission variable local oscillator and the fifth transmission variable local oscillator are generated by the DDS, and then frequency multiplication is carried out for 2 times, and filtering output is carried out to the analog transmission channels 1 and 2.
The method comprises the steps of providing 2 paths of receiving variable local oscillators with the frequency of more than 100000hop/s per second to analog receiving channels 1 and 2, wherein the receiving variable local oscillators consist of 5 sections in total, namely a first receiving variable local oscillator, a second receiving variable local oscillator, a third receiving variable local oscillator, a fourth receiving variable local oscillator and a fifth receiving variable local oscillator which are stepped to 1KHz, wherein the first receiving variable local oscillator, the second receiving variable local oscillator and the third receiving variable local oscillator are directly generated by a DDS (direct digital synthesis), and then are output to the analog receiving channels 1 and 2 after being filtered, the fourth receiving variable local oscillator and the fifth receiving variable local oscillator are generated by the DDS, the first receiving variable local oscillator and the second receiving variable local oscillator are output to the analog receiving channels 1 and 2 after being subjected to frequency multiplication for 2 times after being filtered.
The local oscillator unit is composed of 4 point frequency sources and 2 types of 5-segment fast frequency hopping sources.
(II) analog transmission channel
The analog transmitting channel realizes the up-conversion from 70MHz intermediate frequency signals to 30 MHz-2 GHz radio frequency signals by adopting a mode of subsection secondary frequency conversion of different frequency bands, a 60dB numerical control attenuator is added in the intermediate frequency band and the final radio frequency band to realize that the level of output signals in the 30 MHz-2 GHz frequency band can be adjusted within-30 dBm-0 dBm, the level error reaches +/-1 dB requirement, the composition and the function of 2 paths of analog transmitting channels are consistent, and the specific implementation method of one path of analog transmitting channels is explained in detail below.
Referring to fig. 3, the analog transmission channel sequentially includes a first transmission mixing module, a second transmission mixing module, and a transmission electric tuning filter bank module; the first transmitting and frequency mixing module is used for mixing the 70MHz intermediate frequency signal with one of a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator according to different output frequencies and outputting a 400MHz or 800MHz or 1200MHz high and intermediate frequency signal; the second transmitting and frequency mixing module selects the high and medium frequency signals according to different output frequencies to perform second frequency mixing with one of a first transmitting variable local oscillator, a second transmitting variable local oscillator, a third transmitting variable local oscillator, a fourth transmitting variable local oscillator and a fifth transmitting variable local oscillator to obtain 30-2000 MHz radio frequency signals; the transmitting electric tuning filter bank module comprises seven filters with different frequency bands, and selects one filter for filtering and outputting 30 MHz-2000 MHz radio frequency signals according to output frequency.
The first transmitting and frequency mixing module sequentially comprises a filter, a first amplifier, a numerical control attenuator, a frequency mixer, an attenuator, a second amplifier, a first three-to-one switch, a filter bank, a second three-to-one switch and a third amplifier, wherein 70MHz intermediate frequency signals firstly pass through the first filter, the first amplifier and the first numerical control attenuator to carry out intermediate frequency filtering, amplification and numerical control attenuation, then the first frequency mixer selects and carries out frequency mixing with one of a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator according to different output frequencies, then the first attenuator and the second amplifier carry out attenuation matching and amplification, and finally the first three-to-one switch, the filter bank, the second three-to-one switch and the third amplifier select the filter bank to filter and amplify and output 400MHz or 800MHz or 1200MHz high-intermediate frequency signals; the filter bank comprises three second filters, the central frequency points of the three second filters are 400MHz, 800MHz and 1200MHz respectively, and the bandwidths are 20MHz respectively.
The second transmitting and frequency mixing module sequentially comprises a second frequency mixer, a second numerical control attenuator and a third amplifier, wherein the high and medium frequency signals are firstly mixed by the second frequency mixer according to different output frequencies by selecting one of a first transmitting variable local oscillator, a second transmitting variable local oscillator, a third transmitting variable local oscillator, a fourth transmitting variable local oscillator and a fifth transmitting variable local oscillator, and then are attenuated and amplified by the second numerical control attenuator and the third amplifier to output 30 MHz-2000 MHz radio frequency signals.
(III) analog reception channel
The analog receiving channel adopts a 30 MHz-2 GHz different frequency band segmented secondary frequency conversion method to realize down conversion from 30 MHz-2 GHz radio frequency signals to 70MHz intermediate frequency signals, an intermediate frequency filter with an intermediate frequency narrow bandwidth 1, an intermediate frequency narrow bandwidth 2, an intermediate frequency narrow bandwidth 3, an intermediate frequency wide bandwidth 1 and an intermediate frequency bandwidth 2 is selected through a switch at the 70MHz intermediate frequency band to realize that the channel bandwidth is selected between the intermediate frequency narrow bandwidth 1, the intermediate frequency narrow bandwidth 2, the intermediate frequency narrow bandwidth 3, the intermediate frequency wide bandwidth 1 and the intermediate frequency bandwidth 2, a numerical control attenuator with 31dB is respectively added at the radio frequency band and the first intermediate frequency band, two stages of numerical control attenuators with 31dB are added at the 70MHz intermediate frequency band at the output end to realize the adjustment of a dynamic range of 110dB, the composition and the function of 2-path analog receiving channels are consistent, and the specific.
Referring to fig. 4, the analog receiving channel sequentially includes a receiving electrically tuned filter bank module, a first receiving mixing module, and a second receiving mixing module; the receiving electric tuning filter bank module comprises seven filters with different frequency bands, and selects one filter for filtering the received 30 MHz-2000 MHz radio frequency signal according to the frequency band of the radio frequency signal; the first receiving frequency mixing module selects one of a first receiving variable local oscillator, a second receiving variable local oscillator, a third receiving variable local oscillator, a fourth receiving variable local oscillator and a fifth receiving variable local oscillator for frequency mixing according to the frequency band of the radio frequency signal, and outputs a high and medium frequency signal of 400MHz, 800MHz or 1200 MHz; the second receiving and frequency mixing module is used for selecting one of the first fixed local oscillator, the second fixed local oscillator and the third fixed local oscillator according to the frequency of the high and medium frequency signals to carry out second frequency mixing, and then down-converting the mixed frequency to an intermediate frequency signal of 70 MHz;
the receiving electric tuning filter bank module specifically comprises a third numerical control attenuator, an alternative switch, a 30 MHz-512 MHz filtering channel, a 500 MHz-2000 MHz filtering channel, a seven-alternative switch and a receiving electric tuning filter bank module. The received 30 MHz-2000 MHz radio frequency signal is first numerically attenuated in a numerically controlled attenuator, the two-way switch selects one of the 30 MHz-512 MHz filtering channel and the 500 MHz-2000 MHz filtering channel for filtering based on the frequency band of the radio frequency signal, and the seven-way switch selects one filter for filtering based on the frequency band of the radio frequency signal.
The first-time receiving frequency mixing module sequentially comprises a fourth amplifier, a second attenuator and a third mixer, the filtered radio-frequency signals are amplified and attenuated in a matched mode through the fourth amplifier and the second attenuator, then the third mixer selects one of a first receiving variable local oscillator, a second receiving variable local oscillator, a third receiving variable local oscillator, a fourth receiving variable local oscillator and a fifth receiving variable local oscillator according to the frequency band of the radio-frequency signals to perform frequency mixing, and high and medium-frequency signals of 400MHz, 800MHz or 1200MHz are output after the frequency mixing.
The second receiving mixing module sequentially comprises a fifth amplifier, a third selection switch, a band-pass filter bank, a fourth third selection switch, a fourth numerical control attenuator, a sixth amplifier, a fourth mixer, a third filter, a seventh amplifier, a fifth numerical control attenuator, a fourth filter, an eighth amplifier, a first fifth selection switch, a fifth channel bandwidth, a second fifth selection switch, a ninth amplifier, a fifth filter, a sixth numerical control attenuator, a tenth amplifier and a sixth filter, wherein a high-intermediate-frequency signal is amplified by the fifth amplifier, filtered by selecting one band-pass filter from the band-pass filter bank according to the frequency of the high-intermediate-frequency signal by the third selection switch and the fourth selection switch, numerically-controlled attenuated and amplified by the fourth numerical control attenuator and the sixth amplifier, and then selected by the fourth mixer according to the frequency of the high-intermediate-frequency signal and fixed local oscillator, One of the second receiving fixed local oscillator and the third receiving fixed local oscillator carries out second frequency mixing, the mixed frequency is down-converted to an intermediate frequency signal of 70MHz, the intermediate frequency signal is filtered, amplified, filtered, numerically-controlled attenuated, filtered and amplified through a third filter, a seventh amplifier, a fifth numerically-controlled attenuator, a fourth filter and an eighth amplifier, one of five channel bandwidths is selected through a first five-out-of-one switch and a second five-out-of-one switch for filtering, and the intermediate frequency signal is amplified, filtered, numerically-controlled attenuated, amplified and filtered through a ninth amplifier, a fifth filter, a sixth numerically-controlled attenuator, a tenth amplifier and a sixth channel bandwidth filter and then is output to the intermediate frequency signal of 70 MHz; the band-pass filter group comprises three band-pass filters, the central frequency points of the three band-pass filters are 400MHz, 800MHz and 1200MHz respectively, the bandwidths are 20MHz respectively, and the bandwidth of a fifth-gear channel is a second-gear intermediate frequency wide bandwidth and a third-gear intermediate frequency narrow bandwidth respectively.
(IV) digital signal processing unit
The digital signal processing unit mainly comprises an FPGA, a 2-way high-speed AD, a 2-way high-speed DA, a 2-way LVDS and the like, and a functional block diagram is shown in FIG. 2 to complete the following functions:
1. the sending end signal processing module completes operations of digital bit stream information modulation, pulse forming, sampling rate conversion, digital up-conversion and the like in the FPGA, so that the processing of various bandwidth signals of 3KHz-20MHz is realized, and finally, the high-speed DA completes digital-to-analog conversion;
2. the receiving end signal processing module is used for completing analog signal digitization through high-speed AD, channel filtering and sampling rate conversion are carried out on digitized signals in the FPGA, and various bandwidth signal processing with the bandwidth of 3KHz-20MHz can be realized;
3. digital intermediate frequency LVDS differential serial input and output;
4. local oscillation control;
5. and exchanging data with the master control machine.
Referring to fig. 6, the sending-end signal processing module sequentially includes an LVDS serial-to-parallel conversion module, a I, Q shunt mapping module, a shaping filter module, a sampling rate conversion module, a digital up-conversion module, and a D/a module, an information sequence received from an LVDS port is first subjected to serial-to-parallel conversion by the LVDS serial-to-parallel conversion module, then divided into two paths of signals I, Q by the I, Q shunt mapping module, and then subjected to shaping filtering, sampling rate conversion, and up-conversion by the shaping filter module, the sampling rate conversion module, and the digital up-conversion module, so as to realize multiple bandwidth selections of 3KHz to 20MHz, and finally, digital-to-analog conversion and orthogonal modulation are completed by the D/a module, and the signals are sent.
Referring to fig. 7, the receiving end signal processing module includes an AD module, an orthogonal digital down-conversion module, a digital filtering module, a sampling rate conversion module, a matched filtering module, a digital AGC, and an LVDS parallel-serial conversion module, wherein 70MHz intermediate frequency signals are first subjected to analog-to-digital conversion by the AD module, then the orthogonal digital down-conversion module completes digital down-conversion, and then are subjected to filtering, sampling rate conversion, and matched filtering by the digital filtering module, the sampling rate conversion module, and the matched filtering module to convert the signal sampling rate into 4 or 8 sampling points in one symbol period, and various bandwidth signals from 3KHz to 20MHz can be processed by setting different filter parameters. In order to improve the dynamic range of the signal, a digital AGC unit is added. And finally, performing parallel-serial conversion through an LVDS parallel-serial conversion module.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. The utility model provides a radio frequency module is synthesized in 30MHz ~ 2GHz multichannel broadband universalization, contains analog transmission channel, local oscillator unit and digital signal processing unit, its characterized in that:
the digital signal processing unit comprises a sending end signal processing module, and the sending end signal processing module is used for outputting a 70MHz intermediate frequency signal to an analog transmitting channel;
the local oscillation unit is used for generating a first fixed local oscillation, a second fixed local oscillation, a third fixed local oscillation, a first transmission variable local oscillation, a second transmission variable local oscillation, a third transmission variable local oscillation, a fourth transmission variable local oscillation and a fifth transmission variable local oscillation, wherein the step of the first transmission variable local oscillation, the second transmission variable local oscillation, the third transmission variable local oscillation, the fourth transmission variable local oscillation and the fifth transmission variable local oscillation is 1 KHz;
the analog transmitting channel sequentially comprises a first transmitting frequency mixing module, a second transmitting frequency mixing module and a transmitting electric tuning filter bank module; the first transmitting and frequency mixing module is used for mixing the 70MHz intermediate frequency signal with one of a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator according to different output frequencies and outputting a 400MHz or 800MHz or 1200MHz high and intermediate frequency signal; the second transmitting and frequency mixing module selects the high and medium frequency signals according to different output frequencies to perform second frequency mixing with one of a first transmitting variable local oscillator, a second transmitting variable local oscillator, a third transmitting variable local oscillator, a fourth transmitting variable local oscillator and a fifth transmitting variable local oscillator to obtain 30-2000 MHz radio frequency signals; the transmitting electric tuning filter bank module comprises seven filters with different frequency bands, and selects one filter for filtering and outputting 30 MHz-2000 MHz radio frequency signals according to output frequency.
2. The RF module of claim 1, wherein the first transmit mixing module comprises a first filter, a first amplifier, a first digital controlled attenuator, a first mixer, a first attenuator, a second amplifier, a first one-out-of-three switch, a filter bank, a second one-out-of-three switch, and a third amplifier, in order, the 70MHz IF signal is first filtered, amplified, and digitally attenuated by the first filter, the first amplifier, and the first digital controlled attenuator, then the first mixer mixes with one of a first fixed local oscillator, a second fixed local oscillator, and a third fixed local oscillator according to different output frequencies, then the first attenuator, the second amplifier perform attenuation matching and amplification, and finally the first one-out-of-three switch, the filter bank, the second fixed local oscillator, and the third amplifier, The second one-out-of-three switch and the third amplifier select the filter bank to filter and amplify and output high and medium frequency signals of 400MHz or 800MHz or 1200 MHz; the filter bank comprises three second filters, the central frequency points of the three second filters are 400MHz, 800MHz and 1200MHz respectively, and the bandwidths are 20MHz respectively.
3. The rf module of claim 1, wherein the second transmit mixing module sequentially includes a second mixer, a second digital controlled attenuator, and a third amplifier, and the second mixer selects one of the first transmit variable local oscillator, the second transmit variable local oscillator, the third transmit variable local oscillator, the fourth transmit variable local oscillator, and the fifth transmit variable local oscillator according to different output frequencies to mix the high and medium frequency signals, and then the second digital controlled attenuator and the third amplifier attenuate and amplify the signals to output 30MHz to 2000MHz rf signals.
4. The 30 MHz-2 GHz multi-channel wide-band generalized integrated RF module of claim 1, wherein the transmitting-end signal processing module sequentially comprises an LVDS serial-parallel conversion module, an I, Q shunt mapping module, a shaping filter module, a sampling rate conversion module, a digital up-conversion module and a D/A module, an information sequence received from an LVDS port is firstly subjected to serial-parallel conversion by the LVDS serial-parallel conversion module, then is divided into I, Q two signals by the I, Q shunt mapping module, and then is subjected to shaping filtering, sampling rate conversion and up-conversion by the shaping filter module, the sampling rate conversion module and the digital up-conversion module, so as to realize selection of various bandwidths of 3KHz-20MHz, and finally is subjected to digital-to-analog conversion and orthogonal modulation by the D/A module and is transmitted to an analog transmission channel.
5. The 30 MHz-2 GHz multi-channel wide-band generalized RF module of claim 1, further comprising an analog receiving channel;
the local oscillation unit is also used for generating a first receiving variable local oscillation, a second receiving variable local oscillation, a third receiving variable local oscillation, a fourth receiving variable local oscillation and a fifth receiving variable local oscillation;
the analog receiving channel sequentially comprises a receiving electric tuning filter bank module, a first receiving frequency mixing module and a second receiving frequency mixing module; the receiving electric tuning filter bank module comprises seven filters with different frequency bands, and the electric tuning filter bank module selects one filter for filtering the received 30 MHz-2000 MHz radio frequency signal according to the frequency band of the radio frequency signal; the first receiving frequency mixing module selects one of a first receiving variable local oscillator, a second receiving variable local oscillator, a third receiving variable local oscillator, a fourth receiving variable local oscillator and a fifth receiving variable local oscillator for frequency mixing according to the frequency band of the radio frequency signal, and outputs a high and medium frequency signal of 400MHz, 800MHz or 1200 MHz; the second receiving and frequency mixing module is used for selecting one of the first fixed local oscillator, the second fixed local oscillator and the third fixed local oscillator according to the frequency of the high and medium frequency signals to carry out second frequency mixing, and then down-converting the mixed frequency to an intermediate frequency signal of 70 MHz;
the digital signal processing unit also comprises a receiving end signal processing module, and the receiving end signal processing module is used for receiving the intermediate frequency signal of 70 MHz.
6. The module of claim 5, further comprising a third digitally controlled attenuator, an alternative switch, a 30 MHz-512 MHz filter channel, a 500 MHz-2000 MHz filter channel, and a seven-out switch, wherein the received 30 MHz-2000 MHz RF signal is digitally attenuated by the third digitally controlled attenuator, the alternative switch selects one of the 30 MHz-512 MHz filter channel and the 500 MHz-2000 MHz filter channel according to the frequency band of the RF signal, and the seven-out switch selects one of the filters according to the frequency band of the RF signal.
7. The rf module of claim 5, wherein the first receiving and mixing module sequentially includes a fourth amplifier, a second attenuator, and a third mixer, the filtered rf signal is amplified and attenuated by the fourth amplifier and the second attenuator, and then the third mixer selects one of the first receiving variable local oscillator, the second receiving variable local oscillator, the third receiving variable local oscillator, the fourth receiving variable local oscillator, and the fifth receiving variable local oscillator according to the frequency band of the rf signal to perform mixing, and outputs a high-and-medium-frequency signal of 400MHz, 800MHz, or 1200MHz after mixing.
8. The RF module of claim 5, wherein the second receiving mixer module comprises a fifth amplifier, a third switch, a band-pass filter bank, a fourth switch, a fourth digital controlled attenuator, a sixth amplifier, a fourth mixer, a third filter, a seventh amplifier, a fifth digital controlled attenuator, a fourth filter, an eighth amplifier, a first switch, a fifth channel bandwidth, a second switch, a ninth amplifier, a fifth filter, a sixth digital controlled attenuator, a tenth amplifier, and a sixth filter, wherein the high-IF signal is amplified by the fifth amplifier, filtered by the third switch, and filtered by the fourth switch according to the frequency of the high-IF signal by selecting one band-pass filter from the band-pass filter bank, then, the fourth digital control attenuator and the sixth amplifier are used for digital control attenuation and amplification, the fourth mixer is used for carrying out second frequency mixing with one of the first receiving fixed local oscillator, the second receiving fixed local oscillator and the third receiving fixed local oscillator according to the frequency selection of the high-intermediate frequency signal, the frequency is down-converted to an intermediate frequency signal of 70MHz after frequency mixing, the intermediate frequency signal is filtered, amplified, filtered, digitally controlled attenuated, filtered and amplified through the third filter, the seventh amplifier, the fifth digital control attenuator, the fourth filter and the eighth amplifier, and the intermediate frequency signal is filtered through the first five-to-one switch and the second five-to-one switch, finally, amplifying, filtering, numerically-controlled attenuating, amplifying and filtering the signals by a ninth amplifier, a fifth filter, a sixth numerically-controlled attenuator, a tenth amplifier and a sixth filter, and outputting the signals to an intermediate frequency signal of 70 MHz; the band-pass filter group comprises three band-pass filters, the central frequency points of the three band-pass filters are 400MHz, 800MHz and 1200MHz respectively, and the bandwidth of a fifth-gear channel is a second-gear intermediate frequency wide bandwidth and a third-gear intermediate frequency narrow bandwidth respectively.
9. The module of claim 5, wherein the signal processing module at the receiving end comprises an AD module, an orthogonal digital down-conversion module, a digital filter module, a sampling rate conversion module, a matched filter module, a digital AGC module, and an LVDS parallel-to-serial conversion module, wherein the intermediate frequency signal of 70MHz is first analog-to-digital converted by the AD module, then the orthogonal digital down-conversion module completes digital down-conversion, then the digital filter module, the sampling rate conversion module, and the matched filter module perform filtering, sampling rate conversion, matched filtering, then the digital AGC module performs digital gain, and finally the LVDS parallel-to-serial conversion module performs parallel-to-serial conversion.
10. The 30 MHz-2 GHz multichannel wide band generalized integrated radio frequency module of claim 5, characterized in that the local oscillator unit adopts a phase locked loop integrated with a VCO to generate a first fixed local oscillator, a second fixed local oscillator and a third fixed local oscillator, wherein the first fixed local oscillator, the second fixed local oscillator and the third fixed local oscillator respectively divide four powers and are output to two analog transmitting channels and two analog receiving channels through one-out-of-three switch gating;
the first emission variable local oscillator, the second emission variable local oscillator and the third emission variable local oscillator are generated by the DDS, the fourth emission variable local oscillator is generated by the first emission variable local oscillator after frequency multiplication for 2 times, and the fifth emission variable local oscillator is generated by the second emission variable local oscillator after frequency multiplication for 2 times;
the first receiving variable local oscillator, the second receiving variable local oscillator and the third receiving variable local oscillator are generated by the DDS, the fourth receiving variable local oscillator is generated by the first receiving variable local oscillator after frequency multiplication for 2 times, and the fifth receiving variable local oscillator is generated by the second receiving variable local oscillator after frequency multiplication for 2 times.
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| CN112260979B (en) * | 2020-10-22 | 2022-02-01 | 电子科技大学 | Multichannel parallel segmented modulation method |
| CN112600573B (en) * | 2020-11-10 | 2022-05-06 | 北京遥测技术研究所 | L or S frequency band can dispose miniaturized multichannel high power digital transmitting component |
| CN113225022B (en) * | 2021-04-30 | 2022-06-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband up-converter |
| CN113872633A (en) * | 2021-11-18 | 2021-12-31 | 中国航空无线电电子研究所 | UV wave band broadband reconfigurable transceiver |
| CN114710121B (en) * | 2022-03-25 | 2024-01-26 | 北京中科飞鸿科技股份有限公司 | Ultra-wideband miniaturized up-down converter |
| CN115021801B (en) * | 2022-08-09 | 2022-11-01 | 沈阳航盛科技有限责任公司 | Digital-analog hybrid high-speed frequency hopping method of airborne satellite communication antenna |
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