CN116032302B - Miniaturized airborne anti-collision zero intermediate frequency receiving channel module - Google Patents
Miniaturized airborne anti-collision zero intermediate frequency receiving channel module Download PDFInfo
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- CN116032302B CN116032302B CN202310064527.XA CN202310064527A CN116032302B CN 116032302 B CN116032302 B CN 116032302B CN 202310064527 A CN202310064527 A CN 202310064527A CN 116032302 B CN116032302 B CN 116032302B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a miniaturized airborne anti-collision zero intermediate frequency receiving channel module, which relates to the field of electronic communication. The invention aims to solve the problems of large volume, difficulty in modularized integration and complex system of the existing air traffic warning and anti-collision system receiver receiving channel module, and is used for realizing the design of the receiving channel module which is miniaturized, light and can be configured in a module way.
Description
Technical Field
The invention relates to the technical field of electronic communication, in particular to a miniaturized airborne anti-collision zero intermediate frequency receiving channel module.
Background
The airborne collision avoidance system is an airborne device which does not depend on a ground air traffic control system and provides collision avoidance for an aircraft, can remind a unit to warn the aircraft flying nearby and send out consultation information so as to guide the unit to visually observe or guide a pilot to maneuver vertically in a height difference mode independently according to action consultation so as to avoid potential collision, and is one of important airborne devices for improving the flight safety of the aircraft. The receiving channel module is a part of an internal receiver of the air traffic early warning and collision avoidance system. The receiver may use a different number of antennas, one for each receive channel, depending on the different usage scenarios. Thus, a plurality of receiving channel module combinations can be used in a modularized manner to complete the receiver in different scenes.
For on-board systems, weight and volume are often very important indicators, with a large impact on the flight load. In particular, unmanned aerial vehicle applications are mature gradually, and the future will cover aspects of social applications. In some unmanned aerial vehicle applications, the collision avoidance system employs a vehicle-mounted collision avoidance system. The unmanned aerial vehicle has more stringent requirements on weight and volume, so miniaturization and light weight become important development directions.
Disclosure of Invention
The invention aims to provide a miniaturized airborne anti-collision zero intermediate frequency receiving channel module, which has the characteristics of miniaturization, light weight and module configuration, can solve the problems of large size, complex circuit and inconvenient use of a receiver receiving channel module in the existing airborne anti-collision system, and provides a miniaturized, light-weight and module-configurable receiving channel module.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a miniaturized airborne anti-collision zero intermediate frequency receiving channel module, which comprises: the input end of the receiving channel is sequentially connected with a limiter, a first filter, a first amplifier and a power divider in series, and the power divider is used for distributing an input signal to a second filter and a third filter;
the second filter is sequentially connected with a second amplifier, a first attenuator, a detector, a fourth amplifier and a first analog-to-digital converter in series;
the third filter is sequentially connected with a third amplifier and a second attenuator in series; the output of the second attenuator is connected to the input end of the zero intermediate frequency mixer; the local oscillator end of the zero intermediate frequency mixer is connected with the local oscillator source, the output end of the zero intermediate frequency mixer is connected to the input end of a fourth filter, and the output end of the fourth filter is connected to the input end of a second analog-to-digital converter;
the first analog-to-digital converter sends the converted digital signal to a digital signal processor for demodulation processing, and outputs the demodulated TCAS/ADS-B data to a later module;
and the second analog-to-digital converter sends the converted digital signal to the digital signal processor for demodulation processing, and outputs demodulated empty pipe inquiry data to the rear-stage module.
Further, the first amplifier is a low noise amplifier, and the fourth amplifier is an operational amplifier;
the first filter, the second filter and the third filter are bandpass filters;
the fourth filter is a low-pass filter;
the first attenuator and the second attenuator are fixed attenuators or numerical control attenuators.
Further, the 3dB bandwidths of the second filter and the third filter are 8 MHz-10 MHz.
Further, the working frequency of the vibration source is 1030MHz + -0.2 MHz.
Further, the spurious free dynamic range of the first analog-to-digital converter and the second analog-to-digital converter is greater than 72dB.
Further, the type of the detector is a logarithmic detector.
Further, the digital signal processor is an FPGA or a DSP.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a miniaturized airborne anti-collision zero intermediate frequency receiving channel module, which comprises a receiving channel, wherein the input end of the receiving channel is sequentially connected with an amplitude limiter, a first filter, a first amplifier and a power divider in series, and the power divider is used for distributing an input signal to a second filter and a third filter; the second filter is serially connected with a second amplifier, a first attenuator, a detector, a fourth amplifier and a first analog-to-digital converter in sequence; the third filter is serially connected with a third amplifier and a second attenuator in sequence; the output of the second attenuator is connected to the input end of the zero intermediate frequency mixer; the local oscillator end of the zero intermediate frequency mixer is connected with the local oscillator source, the output end of the zero intermediate frequency mixer is connected to the input end of the fourth filter, and the output end of the fourth filter is connected to the input end of the second analog-to-digital converter; the first analog-to-digital converter sends the converted digital signal to the digital signal processor for demodulation processing, and outputs the demodulated TCAS/ADS-B data to the post-stage module; and the second analog-to-digital converter sends the converted digital signal to the digital signal processor for demodulation processing, and outputs demodulated empty pipe inquiry data to the rear-stage module. The invention has high integration level, small volume and small weight, and most of functional units can be integrated in one chip, so that the invention is flexible and convenient to use. The invention also removes the local oscillation and the filter circuit in the low intermediate frequency conversion scheme, reduces the weight and reduces the complexity of the circuit. The receiving channel has complete receiving function, can selectively receive different signals, and has high modularization degree.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a miniaturized airborne anti-collision zero intermediate frequency receiving channel module provided by the invention.
Reference numerals illustrate: LIM 1-limiter, BPF 1-first filter, BPF 2-second filter, BPF 3-third filter, DMIX 1-zero intermediate frequency mixer, LO 1-local vibration source, U1-digital signal processor, LNA 1-first amplifier, AMP 1-second amplifier, AMP 2-third amplifier, OPAMP 1-fourth amplifier, PS 1-power divider, ATT 1-attenuator, ADC 1-first analog-to-digital converter, ADC 2-second analog-to-digital converter, DET 1-detector, ATT 1-first attenuator, ATT 2-second attenuator.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a miniaturized airborne anti-collision zero intermediate frequency receiving channel module, which has the characteristics of miniaturization, light weight and module configuration, and can solve the problems of large size, complex circuit and inconvenient use of a receiver receiving channel module in the existing airborne anti-collision system.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the miniaturized airborne anti-collision zero intermediate frequency receiving channel module provided by the embodiment of the invention comprises a receiving channel, wherein the input end of the receiving channel is sequentially connected in series with a limiter LIM1, a first filter BPF1, a first amplifier LNA1 and a power divider PS1, the power divider PS1 divides an input signal into two parts, one part is connected to a second filter BPF2, and the other part is connected to a third filter BPF3. The second filter BPF2 is followed by a second amplifier AMP1, a first attenuator ATT1, a detector DET1, a fourth amplifier OPAMP1 and a first analog-to-digital converter ADC1 in series. The digital signal converted by the first analog-to-digital converter ADC1 is sent to a digital signal processor U1 (FPGA or DSP) for demodulation processing, and the demodulated TCAS/ADS-B data is output to a later module. The third filter BPF3 is followed by a third amplifier AMP2 and a second attenuator ATT2 in series. The output of the second attenuator ATT2 is connected to the input of the zero intermediate frequency mixer DMIX 1. The local oscillator end of the zero intermediate frequency mixer DMIX1 is connected with the local oscillator LO1, the output end of the zero intermediate frequency mixer DMIX1 is connected to the input end of the fourth filter LPF1, and the output end of the fourth filter LPF1 is connected to the input end of the analog-to-digital converter ADC 2. The digital signal converted by the second analog-to-digital converter ADC2 is sent to a digital signal processor U1 (FPGA or DSP) for demodulation processing, and the demodulated empty pipe inquiry data is output to a later module.
In this embodiment, the first amplifier LNA1 is a low noise amplifier, and is configured to reduce the noise figure of the overall circuit and provide gain; the fourth amplifier OPAMP1 is an operational amplifier and is used for adjusting the amplitude of the detection signal, so that the optimal input range of the ADC1 is met in the whole input dynamic range, and the dynamic range is improved; in the present embodiment, the second amplifier AMP1 and the third amplifier AMP2 may be driving amplifiers or low noise amplifiers.
In the present embodiment, the first filter BPF1, the second filter BPF2, and the third filter BPF3 are bandpass filters. The first filter BPF1 is used for filtering out the spurious signals outside the input band, preventing the spurious signals from leaking to the next stage, and simultaneously preventing the LNA1 from being saturated by the spurious signal drive. The second filter BPF2 is used for filtering 1030MHz and other spurious signals, limiting the signal bandwidth, reducing noise amplitude and improving sensitivity. The third filter BPF3 is used for filtering 1030MHz and other spurious signals, limiting the signal bandwidth, reducing noise amplitude and improving sensitivity.
The fourth filter LPF1 is a low-pass filter, and is configured to filter out a high-frequency component after zero intermediate frequency conversion, and improve a signal-to-noise ratio of a signal input to the ADC 2.
The first attenuator ATT1 and the second attenuator ATT2 are fixed attenuators or numerical control attenuators, the gain of a circuit where the digital control attenuators are located can be dynamically adjusted, and the gain can be adjusted by the fixed attenuators while front-back stage matching is adjusted.
In this embodiment, the 3dB bandwidths of the second filter BPF2 and the third filter BPF3 are 8MHz to 10MHz, the working frequency of the local oscillation source is 1030mhz±0.2MHz, the spurious-free dynamic range of the first analog-to-digital converter ADC1 and the second analog-to-digital converter ADC2 is greater than 72dB, and the detector DET1 adopts a logarithmic detector.
In this embodiment, the TCAS/ADS-B signal debugging modes are ASK, so that the envelope signal can be obtained directly through detection, and the envelope signal can be demodulated after being sent to the ADC to be converted into digital data. The embodiment adopts a radio frequency direct detection mode, compared with a down-conversion mode to an intermediate frequency mode, the size of a required filter can be reduced, meanwhile, local oscillation signals and a frequency mixing circuit which are required by down-conversion are not required, and the complexity and the size of a circuit are reduced.
The empty pipe interrogation signal S mode of this embodiment uses DPSK modulation, so that it cannot be directly detected and demodulated, and after frequency conversion to zero intermediate frequency, the filtering only needs to use a low pass filter. Compared with a band-pass filter filtering mode of down-converting to intermediate frequency, the zero intermediate frequency demodulation mode is adopted, the design of the intermediate frequency filter is simplified, the area is saved, and the image frequency suppression degree is improved. Compared with an intermediate frequency mode, the zero intermediate frequency scheme is easy to integrate into a single chip and can be finished by only needing an external low-pass filter. And the low-pass filter can use a numerical control mode to flexibly adjust the 3dB bandwidth, and great convenience can be brought to system debugging optimization.
In the other technical features of the embodiment, those skilled in the art can flexibly select to meet different specific actual requirements according to actual conditions. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known compositions, structures, or components have not been described in detail so as not to obscure the invention, and are within the scope of the invention as defined by the appended claims.
In the description of the invention, the terms "disposed," "mounted," "connected," and the like are intended to be broad in the sense that those skilled in the art will appreciate broadly unless otherwise specifically defined and limited. For example, the present invention may be fixedly connected, movably connected, integrally connected, or partially connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements, etc., and it is understood by those skilled in the art that the specific meaning of the terms in the present invention, i.e., the expression of the word language and the implementation of the actual technology may be flexibly corresponding, and the expression of the word language (including the drawing) in the specification of the present invention does not constitute any single limiting interpretation of the claims.
Modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the invention as defined by the appended claims. In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known techniques, such as specific construction details, operating conditions, and other technical conditions, have not been described in detail in order to avoid obscuring the present invention.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. A miniaturized airborne collision avoidance zero intermediate frequency receiving channel module, comprising: the input end of the receiving channel is sequentially connected with a limiter, a first filter, a first amplifier and a power divider in series, and the power divider is used for distributing an input signal to a second filter and a third filter;
the second filter is sequentially connected with a second amplifier, a first attenuator, a detector, a fourth amplifier and a first analog-to-digital converter in series;
the third filter is sequentially connected with a third amplifier and a second attenuator in series; the output of the second attenuator is connected to the input end of the zero intermediate frequency mixer; the local oscillator end of the zero intermediate frequency mixer is connected with the local oscillator source, the output end of the zero intermediate frequency mixer is connected to the input end of a fourth filter, and the output end of the fourth filter is connected to the input end of a second analog-to-digital converter;
the first analog-to-digital converter sends the converted digital signal to a digital signal processor for demodulation processing, and outputs the demodulated TCAS/ADS-B data to a later module;
the second analog-to-digital converter sends the converted digital signal to the digital signal processor for demodulation processing, and outputs demodulated empty pipe inquiry data to the rear-stage module;
the first amplifier is a low noise amplifier, the fourth amplifier is an operational amplifier, the first filter, the second filter and the third filter are band-pass filters, and the fourth filter is a low pass filter.
2. The miniaturized airborne collision avoidance zero intermediate frequency receive channel module of claim 1 wherein,
the first attenuator and the second attenuator are fixed attenuators or numerical control attenuators.
3. The miniaturized on-board anti-collision zero intermediate frequency receiving channel module of claim 1, wherein the 3dB bandwidths of the second filter and the third filter are both 8 MHz-10 MHz.
4. The miniaturized airborne collision avoidance zero intermediate frequency receive channel module of claim 1 wherein the operating frequency of the present vibration source is 1030MHz ± 0.2MHz.
5. The miniaturized on-board anti-collision zero intermediate frequency receive channel module of claim 1, in which the spurious free dynamic range of the first analog-to-digital converter and the second analog-to-digital converter is greater than 72dB.
6. The miniaturized on-board anti-collision zero intermediate frequency receive channel module of claim 1, in which the detector is of the logarithmic type.
7. The miniaturized on-board collision avoidance zero intermediate frequency receive channel module of claim 1 wherein the digital signal processor is an FPGA or DSP.
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