CN109975772B - Multi-system radar interference performance detection system - Google Patents
Multi-system radar interference performance detection system Download PDFInfo
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- CN109975772B CN109975772B CN201811618840.9A CN201811618840A CN109975772B CN 109975772 B CN109975772 B CN 109975772B CN 201811618840 A CN201811618840 A CN 201811618840A CN 109975772 B CN109975772 B CN 109975772B
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/38—Jamming means, e.g. producing false echoes
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
Abstract
The invention provides a multi-system radar interference performance detection system.A baseband module is designed for receiving and transmitting to realize the simulation and generation of a target echo signal and a preset baseband signal, and transmits the preset baseband signal to an up-conversion module which is responsible for converting the preset baseband signal of a broadband to a radio frequency and providing an excitation signal as an excitation source for an interference device; the down-conversion module is responsible for converting the frequency of the interference signal to a baseband, the baseband module receives the baseband signal formed by converting the frequency of the interference signal, and after the baseband signal and the echo signal are synthesized into a superposed signal, the baseband module analyzes the superposed signal to realize radar interference performance detection; therefore, the method adopts a method of mixed receiving of the simulated echo signal and the actual interference signal to detect the interference efficiency of the external interference device, and is more suitable for the practical environment of the tested equipment.
Description
Technical Field
The invention belongs to the technical field of radar interference, and particularly relates to a multi-system radar interference performance detection system.
Background
Radar jamming is electronic interference that degrades or even completely loses the performance of an enemy device by disturbing or spoofing the enemy's radar device. The effect of radar interference is an important index for measuring the performance of radar interference equipment and an important means for considering the role of radar interference technology in war. Therefore, effective and accurate estimation and detection of radar jamming is an extremely important link in the development and production stages of radar jamming equipment.
At present, research aiming at a radar interference efficiency detection method is still in a starting stage, the detection method is relatively simple and is generally realized by adopting an energy detection method, namely, interference efficiency is judged by detecting interference signal power, and the method can only detect the interference effect of a pressure mode and cannot effectively evaluate the deception interference efficiency.
Disclosure of Invention
In order to solve the above problems, the present invention provides a multi-system radar interference performance detection system, which detects the interference performance of an external interference device by using a method of mixed reception of an analog echo signal and an actual interference signal, and is more suitable for the practical environment of a device under test.
A multi-system radar interference performance detection system comprises a baseband module, an up-conversion module and a down-conversion module;
the baseband module is used for generating an echo signal and a preset baseband signal of a target;
the up-conversion module is used for converting the preset baseband signal into a radio frequency signal and using the radio frequency signal as an excitation signal of an external interference device;
the down-conversion module is used for receiving an interference signal generated by an external interference device under the action of the excitation signal and then down-converting the interference signal into a baseband signal;
the baseband module is used for receiving a baseband signal output by the down-conversion module and loading the baseband signal on the echo signal to obtain a superposed signal; and then, carrying out deskew analysis on the superposed signals to obtain pulse pressure signals of the superposed signals, and judging whether the interference signals effectively interfere the echo signals or not according to the pulse pressure signals, thereby realizing radar interference performance detection.
Further, the baseband module comprises an FPGA module, a DA conversion module and an AD conversion module;
the FPGA module is used for generating an echo signal and a preset baseband signal of a target;
the DA conversion module is used for converting the preset baseband signal into an analog signal, and then the up-conversion module converts the analog signal into a radio frequency signal;
the AD conversion module is used for converting the baseband signal output by the down-conversion module into a digital signal, and then the FPGA module loads the digital signal on the echo signal to obtain a superposed signal; and then, carrying out deskew analysis on the superposed signals to obtain pulse pressure signals of the superposed signals, and judging whether the interference signals effectively interfere the echo signals or not according to the pulse pressure signals.
Further, the baseband module further comprises a filter and a power adjusting module;
the filter is used for filtering the analog signal and then inputting the analog signal into the up-conversion module;
the power adjusting module is used for performing power attenuation on the baseband signal output by the down-conversion module and then inputting the baseband signal into the AD conversion module.
Further, the system for detecting the interference performance of the multi-system radar also comprises a local oscillation module;
the local oscillator module is used for providing local oscillator signals for the up-conversion module and the down-conversion module and providing reference clocks for the up-conversion module, the down-conversion module and the baseband module.
Further, the system for detecting the interference performance of the multi-system radar further comprises a local oscillation module which provides local oscillation signals for the up-conversion module, wherein the up-conversion module comprises a 1.2GHz filter, a 2.4GHz filter and a power amplifier;
if the up-conversion module outputs excitation signals with frequency points below a P wave band and an L wave band of 2GHz, the preset baseband signals are directly output as the radio-frequency signals after being subjected to power amplification through the power amplifier;
if the up-conversion module outputs excitation signals with frequency points within the range of S wave band and C wave band of 2 GHz-8 GHz, filtering the preset baseband signals through a 1.2GHz filter to obtain preset baseband signals with frequency points of 1.2GHz, and then mixing the preset baseband signals with the local oscillator signals to obtain radio frequency signals of required frequency points, wherein the frequency points of the local oscillator signals are the difference values of the frequency points of the preset baseband signals of 1.2GHz and the required frequency points;
if the up-conversion module outputs an excitation signal with a frequency point within an X wave band range of 8 GHz-12 GHz, filtering the preset baseband signal through a 2.4GHz filter to obtain a preset baseband signal with a frequency point of 2.4GHz, and then mixing the preset baseband signal with the local oscillator signal to obtain a radio frequency signal of a required frequency point, wherein the frequency point of the local oscillator signal is a difference value between the frequency point of the preset baseband signal with the frequency point of 2.4GHz and the required frequency point.
Further, the up-conversion module further comprises a filter bank and a power adjustment module, wherein the filter bank comprises at least two filters, and the filtering range of the filter bank is 2 GHz-12 GHz;
the filter is used for filtering the radio frequency signal of the required frequency point and then inputting the radio frequency signal into the power adjusting module;
the power adjusting module is used for amplifying the power of the radio frequency signal of the required frequency point after filtering, and taking the radio frequency signal of the required frequency point after power amplification as an excitation signal.
Further, the system for detecting the interference performance of the multi-system radar further comprises a local oscillation module for providing local oscillation signals for the down-conversion module, and the down-conversion module comprises a power amplifier;
if the frequency point of the interference signal is below the P wave band and the L wave band of 2GHz, the interference signal is directly output as the baseband signal after being subjected to power amplification by the power amplifier;
if the frequency point of the interference signal is in the range of S wave band and C wave band of 2 GHz-8 GHz, the interference signal and the local oscillator signal are subjected to frequency mixing to obtain a baseband signal with the frequency point of 1.2GHz as output, wherein the frequency point of the local oscillator signal is the difference value between the frequency point of the interference signal and 1.2 GHz;
and if the frequency point of the interference signal is within the X wave band range of 8 GHz-12 GHz, mixing the interference signal with the local oscillator signal to obtain a 2.4GHz baseband signal as output, wherein the frequency point of the local oscillator signal is the difference value between the frequency point of the interference signal and the 2.4 GHz.
Further, the down-conversion module further comprises a 1.2GHz filter, a 2.4GHz filter, a first power amplifier and a second power amplifier;
the 1.2GHz filter is used for filtering the baseband signal with the frequency point of 1.2GHz and then inputting the baseband signal into the first power amplifier;
the first power amplifier is used for performing power amplification on the filtered 1.2GHz baseband signal and outputting the power-amplified 1.2GHz baseband signal;
the 2.4GHz filter is used for filtering the baseband signal with the frequency point of 2.4GHz and then inputting the baseband signal into the second power amplifier;
and the second power amplifier is used for performing power amplification on the filtered 2.4GHz baseband signal and outputting the power-amplified 1.2GHz baseband signal.
Further, the down-conversion module further comprises a power amplifier, when the frequency point of the interference signal is within the range of 2 GHz-12 GHz, whether the high-frequency part of the interference signal is smaller than a preset value is judged, and if the high-frequency part of the interference signal is smaller than the preset value, the interference signal is subjected to power amplification through the power amplifier and then is mixed with the local oscillator signal.
Has the advantages that:
the invention provides a multi-system radar interference performance detection system.A baseband module is designed for receiving and transmitting to realize the simulation and generation of a target echo signal and a preset baseband signal, and transmits the preset baseband signal to an up-conversion module which is responsible for converting the preset baseband signal of a broadband to a radio frequency and providing an excitation signal as an excitation source for an interference device; the down-conversion module is responsible for converting the frequency of the interference signal to a baseband, the baseband module receives the baseband signal formed by converting the frequency of the interference signal, and after the baseband signal and the echo signal are synthesized into a superposed signal, the baseband module analyzes the superposed signal to realize radar interference performance detection; therefore, the method adopts a method of mixed reception of the simulated echo signal and the actual interference signal to detect the interference efficiency of the external interference device, and is more suitable for the practical environment of the tested equipment; meanwhile, the emission and the receiving of the baseband module work simultaneously, the receiving is real-time processing, and real-time signal sorting and characteristic extraction are carried out according to the working state of the detected interference device, so that the detection result is more visual and rapid.
Drawings
Fig. 1 is a schematic block diagram of a multi-system radar interference performance detection system provided in the present invention;
FIG. 2 is a schematic block diagram of another multi-system radar interference performance detection system provided in the present invention;
fig. 3 is a schematic block diagram of an up-conversion module provided in the present invention;
fig. 4 is a schematic block diagram of a down-conversion module provided in the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
Example one
Referring to fig. 1, the schematic block diagram of a multi-system radar interference performance detection system provided in this embodiment is shown. A multi-system radar interference performance detection system comprises a baseband module, an up-conversion module and a down-conversion module;
the baseband module is used for generating an echo signal and a preset baseband signal of a target;
the up-conversion module is used for converting the preset baseband signal into a radio frequency signal and using the radio frequency signal as an excitation signal of an external interference device;
the down-conversion module is used for receiving an interference signal generated by an external interference device under the action of the excitation signal and then down-converting the interference signal into a baseband signal;
the baseband module is used for receiving a baseband signal output by the down-conversion module and loading the baseband signal on the echo signal to obtain a superposed signal; and then, carrying out deskew analysis on the superposed signals to obtain pulse pressure signals of the superposed signals, and judging whether the interference signals effectively interfere the echo signals or not according to the pulse pressure signals, thereby realizing radar interference performance detection.
Example two
Based on the above embodiments, this embodiment provides an implementation manner of the baseband module. Referring to fig. 2, the schematic block diagram of another multi-system radar interference performance detection system provided in this embodiment is shown.
The utility model provides a many systems radar interference performance detecting system, still includes the local oscillator module, wherein, the local oscillator module is used for the up-conversion module provides local oscillator signal with down the frequency conversion module, provides the reference clock for up-conversion module, down frequency conversion module and baseband module.
It should be noted that, in this embodiment, the same local oscillator is used to perform up-down frequency conversion and synchronous triggering simultaneously, so that a certain coherent relationship is maintained between the transmitted preset baseband signal and the received baseband signal, characteristics of the interference signal can be completely extracted and analyzed, a high signal analysis capability can be realized under the simplest hardware condition, and frequency and time measurement accuracy can be improved.
Further, the baseband module comprises an FPGA module, a DA conversion module, an AD conversion module, a filter, and a power adjustment module;
the FPGA module is used for generating an echo signal and a preset baseband signal of a target;
the DA conversion module is used for converting the preset baseband signal into an analog signal;
the filter is used for filtering the analog signal and inputting the analog signal into the up-conversion module;
the up-conversion module converts the frequency of the filtered analog signal into a radio frequency signal;
the power adjusting module is used for performing power attenuation on the baseband signal output by the down-conversion module and then inputting the baseband signal into the AD conversion module;
the AD conversion module is used for converting the baseband signal output by the down-conversion module after power attenuation into a digital signal, and then the FPGA module loads the digital signal on the echo signal to obtain a superposed signal; and then, carrying out deskew analysis on the superposed signals to obtain pulse pressure signals of the superposed signals, and judging whether the interference signals effectively interfere the echo signals or not according to the pulse pressure signals.
It should be noted that, in the design of the system, the self-checking function is considered, and the excitation signal output by the up-conversion module is divided into one path to the down-conversion module, which is the self-checking loop; the self-checking loop is started in the self-checking process of the whole machine, and whether the working state is normal or not is checked by receiving the excitation signal output by the up-conversion module, so that the switching and self-checking functions of each switch in the two frequency conversion modules are realized.
It should be noted that, in order to prevent the high-power signal input, a high-power attenuator is first added at the receiving end of the baseband module to adjust the power to the normal operating range of the signal receiving link. Further, the baseband module further comprises a filter and a power adjusting module;
the filter is used for filtering the analog signal and inputting the analog signal into the up-conversion module;
the power adjusting module is used for performing power attenuation on the baseband signal output by the down-conversion module and then inputting the baseband signal into the AD conversion module.
Therefore, the baseband module of the embodiment includes an AD conversion module and a DA conversion module, and can simultaneously transmit and receive baseband signals, and perform data interaction by using a unified FPGA module, and perform centralized management on transmission and reception control. The preset baseband signal transmitted by the DA conversion module is divided into two paths in the up-conversion module, one path of signal is subjected to frequency conversion, each frequency band is filtered through different filter channels, the other path of signal is directly output after power adjustment, and full-frequency band coverage is realized through switch switching. The interference signal is also divided into two paths after being input into the down-conversion module, one path is mixed to the baseband module, the other path is directly output to the baseband module after being subjected to power regulation, and the two paths are collected by the AD conversion module and are transmitted to the FPGA module for analysis.
EXAMPLE III
Based on the above embodiments, this embodiment provides an implementation manner of the up-conversion module. Referring to fig. 3, this figure is a schematic block diagram of the up-conversion module provided in this embodiment. The up-conversion module comprises a 1.2GHz filter, a 2.4GHz filter and a power amplifier;
if the up-conversion module outputs excitation signals with frequency points below a P wave band and an L wave band of 2GHz, the preset baseband signals are directly output as the radio-frequency signals after being subjected to power amplification through the power amplifier;
if the up-conversion module outputs excitation signals with frequency points within the range of S wave band and C wave band of 2 GHz-8 GHz, filtering the preset baseband signals through a 1.2GHz filter to obtain preset baseband signals with frequency points of 1.2GHz, and then mixing the preset baseband signals with the local oscillator signals to obtain radio frequency signals of required frequency points, wherein the frequency points of the local oscillator signals are the difference values of the frequency points of the preset baseband signals of 1.2GHz and the required frequency points;
if the up-conversion module outputs an excitation signal with a frequency point within an X wave band range of 8 GHz-12 GHz, filtering the preset baseband signal through a 2.4GHz filter to obtain a preset baseband signal with a frequency point of 2.4GHz, and then mixing the preset baseband signal with the local oscillator signal to obtain a radio frequency signal of a required frequency point, wherein the frequency point of the local oscillator signal is a difference value between the frequency point of the preset baseband signal with the frequency point of 2.4GHz and the required frequency point.
It should be noted that the frequency ranges of the P band and the L band are below 2GHz, the frequency range of the S band is 2GHz to 4GHz, the frequency range of the C band is 4GHz to 8GHz, and the frequency range of the X band is 8GHz to 12 GHz; the system needs to cover the mixing from the S band to the X band and needs to adopt a local oscillator signal of 3 GHz-20 GHz.
Therefore, for the signal generation function, the up-conversion module provided by this embodiment is divided into four channels, one is a through channel, that is, the P-band and L-band portions below 2.0GHz do not need to be mixed, and the other three channels respectively include S, C, X frequency band mixing filtering and power conditioning. In order to adapt to the larger difference of the bandwidths of radar signals in different wave bands, the intermediate frequency of different mixing channels is designed into two types, one type is the intermediate frequency of 1.3GHz bandwidth, and the frequency point is 2.4 GHz; one is the intermediate frequency corresponding to the bandwidth below 400MHz, and the frequency point is 1.2 GHz. Therefore, the S band and the C band share the medium frequency point of 1.2 GHz; the X wave band adopts 2.4GHz intermediate frequency alone.
It should be noted that, in this embodiment, the switching of different channels may be realized by a plurality of switches; for example, because signals below 2GHz do not need to be mixed, the channels are firstly divided into channels needing to be mixed and channels not needing to be mixed through one alternative switch, and then in the channels needing to be mixed, the excitation signals of 2 GHz-4 GHz S-bands, the excitation signals of 4 GHz-8 GHz C-bands or the excitation signals of 8 GHz-12 GHz X-bands are output through a plurality of alternative switches; further, if the frequency point of the preset baseband signal is 1.2GHz, if the up-conversion module is to output a signal below 2GHz, the alternative switch is connected to a channel that does not need mixing, and the preset baseband signal is directly output as the radio frequency signal after being power-amplified by the power amplifier.
In addition, under a primary mixing architecture, in order to achieve full-band coverage and suppress harmonic spurious points, each band needs to be further divided into bands, which are achieved by adopting a broadband filter bank, and each filter bandwidth needs to cover a corresponding signal bandwidth. Further, the up-conversion module further comprises a filter bank and a power adjustment module, wherein the filter bank comprises at least two filters, and the filtering range of the filter bank is 2 GHz-12 GHz;
the filter is used for filtering the radio frequency signal of the required frequency point and then inputting the radio frequency signal into the power adjusting module;
the power adjusting module is used for amplifying the power of the radio frequency signal of the required frequency point after filtering, and taking the radio frequency signal of the required frequency point after power amplification as an excitation signal.
Referring to fig. 3, for the three frequency bands of the S band, the C band and the X band, the three frequency bands are further subdivided into three filtering frequency bands, that is, the three frequency bands of the S band, the C band and the X band correspond to three filters, respectively, wherein the filtering frequency bands of the filters corresponding to the S band are 2GHz to 2.7GHz, 2.7GHz to 3.4GHz and 3.4GHz to 4GHz, respectively; the filter frequency bands corresponding to the C wave band are respectively 4 GHz-5.3 GHz, 5.3 GHz-6.6 GHz and 6.6 GHz-8 GHz; the filter frequency bands corresponding to the X wave band are respectively 8 GHz-9.3 GHz, 9.3 GHz-10.6 GHz and 10.6 GHz-12 GHz. After the frequency mixing of the baseband signal and the local oscillator signal is preset, the obtained radio frequency signal is input into a corresponding filter for filtering in which frequency band range, in a way of switching a channel by a switch, so that the purpose of suppressing harmonic stray points is achieved.
Example four
Based on the above embodiments, this embodiment provides an implementation manner of the up-conversion module. Referring to fig. 4, this figure is a schematic block diagram of the down-conversion module provided in this embodiment. The down conversion module comprises a power amplifier;
if the frequency point of the interference signal is below the P wave band and the L wave band of 2GHz, the interference signal is directly output as the baseband signal after being subjected to power amplification by the power amplifier;
if the frequency point of the interference signal is in the range of S wave band and C wave band of 2 GHz-8 GHz, the interference signal and the local oscillator signal are subjected to frequency mixing to obtain a baseband signal with the frequency point of 1.2GHz as output, wherein the frequency point of the local oscillator signal is the difference value between the frequency point of the interference signal and 1.2 GHz;
and if the frequency point of the interference signal is within the X wave band range of 8 GHz-12 GHz, mixing the interference signal with the local oscillator signal to obtain a 2.4GHz baseband signal as output, wherein the frequency point of the local oscillator signal is the difference value between the frequency point of the interference signal and the 2.4 GHz.
Therefore, for the signal receiving function, the down-conversion module provided by this embodiment directly samples the part below 2.0GHz, and the part above 2.0GHz adopts the same local oscillator as the signal source to perform frequency mixing once, and then performs sampling analysis. That is, the receiving channels are divided into three channels, one is a through channel below 2GHz, and the other two are mixing channels. The mixing channel comprises a 1.2GHz intermediate frequency channel and a 2.4GHz intermediate frequency channel, and is consistent with the intermediate frequency point of the transmitting end. The signal analysis link is simpler than the signal generation link because the interference signal is correlated as the measured signal with the excitation signal emitted by the radar source, whether in the spoof mode or the squelch mode, and the carrier frequency of the interference signal is identical or close to the carrier frequency of the radar simulation source. Thus, the jamming signal receiving circuit can be designed as a known carrier frequency test scheme without the problem of image rejection.
It should be noted that the finally output baseband signal is sent to the baseband module for acquisition and analysis, the AD conversion module converts the analog signal into a digital signal, and the power detection and spectrum analysis are realized by the FPGA module after the intermediate frequency is digitized, and the digital deskew processing and the intra-pulse signal sorting and identification of the interference signal can also be completed, thereby realizing the radar interference performance detection.
Further, the down-conversion module further comprises a 1.2GHz filter, a 2.4GHz filter, a first power amplifier and a second power amplifier;
the 1.2GHz filter is used for filtering the baseband signal with the frequency point of 1.2GHz and then inputting the baseband signal into the first power amplifier;
the first power amplifier is used for performing power amplification on the filtered 1.2GHz baseband signal and outputting the power-amplified 1.2GHz baseband signal;
the 2.4GHz filter is used for filtering the baseband signal with the frequency point of 2.4GHz and then inputting the baseband signal into the second power amplifier;
and the second power amplifier is used for performing power amplification on the filtered 2.4GHz baseband signal and outputting the power-amplified 1.2GHz baseband signal.
It should be noted that, in order to increase the dynamic range and the receiving sensitivity of the receiver, an amplifier selection channel may be added in the front of the mixing channel. Further, the down-conversion module further comprises a power amplifier, when the frequency point of the interference signal is within the range of 2 GHz-12 GHz, whether the high-frequency part of the interference signal is smaller than a preset value is judged, and if the high-frequency part of the interference signal is smaller than the preset value, the interference signal is subjected to power amplification through the power amplifier and then is mixed with the local oscillator signal.
Therefore, the transmitting and receiving channels of the radar interference performance detection system are designed in a double-intermediate frequency mode, the transmitting and receiving intermediate frequencies are completely consistent, detection of interference signals with different bandwidths is facilitated, the up-conversion module and the down-conversion module both adopt a one-time frequency mixing framework, cost can be reduced, and complexity of circuit design is effectively reduced.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it will be understood by those skilled in the art that various changes and modifications may be made herein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A multi-system radar interference performance detection system is characterized by comprising a baseband module, an up-conversion module and a down-conversion module;
the baseband module is used for generating an echo signal and a preset baseband signal of a target;
the up-conversion module is used for converting the preset baseband signal into a radio frequency signal and using the radio frequency signal as an excitation signal of an external interference device;
the down-conversion module is used for receiving an interference signal generated by an external interference device under the action of the excitation signal and then down-converting the interference signal into a baseband signal;
the baseband module is used for receiving a baseband signal output by the down-conversion module and loading the baseband signal on the echo signal to obtain a superposed signal; and then, carrying out deskew analysis on the superposed signals to obtain pulse pressure signals of the superposed signals, and judging whether the interference signals effectively interfere the echo signals or not according to the pulse pressure signals, thereby realizing radar interference performance detection.
2. The system of claim 1, wherein the baseband module comprises an FPGA module, a DA conversion module, and an AD conversion module;
the FPGA module is used for generating an echo signal and a preset baseband signal of a target;
the DA conversion module is used for converting the preset baseband signal into an analog signal, and then the up-conversion module converts the analog signal into a radio frequency signal;
the AD conversion module is used for converting the baseband signal output by the down-conversion module into a digital signal, and then the FPGA module loads the digital signal on the echo signal to obtain a superposed signal; and then, carrying out deskew analysis on the superposed signals to obtain pulse pressure signals of the superposed signals, and judging whether the interference signals effectively interfere the echo signals or not according to the pulse pressure signals.
3. The system of claim 2, wherein the baseband module further comprises a filter and power adjustment module;
the filter is used for filtering the analog signal and then inputting the analog signal into the up-conversion module;
the power adjusting module is used for performing power attenuation on the baseband signal output by the down-conversion module and then inputting the baseband signal into the AD conversion module.
4. The system according to claim 1, further comprising a local oscillation module;
the local oscillator module is used for providing local oscillator signals for the up-conversion module and the down-conversion module and providing reference clocks for the up-conversion module, the down-conversion module and the baseband module.
5. The system according to claim 1, further comprising a local oscillator module providing a local oscillator signal to the up-conversion module, wherein the up-conversion module includes a 1.2GHz filter, a 2.4GHz filter, and a power amplifier;
if the up-conversion module outputs excitation signals with frequency points below a P wave band and an L wave band of 2GHz, the preset baseband signals are directly output as the radio-frequency signals after being subjected to power amplification through the power amplifier;
if the up-conversion module outputs excitation signals with frequency points within the range of S wave band and C wave band of 2 GHz-8 GHz, filtering the preset baseband signals through a 1.2GHz filter to obtain preset baseband signals with frequency points of 1.2GHz, and then mixing the preset baseband signals with the local oscillator signals to obtain radio frequency signals of required frequency points, wherein the frequency points of the local oscillator signals are the difference values of the frequency points of the preset baseband signals of 1.2GHz and the required frequency points;
if the up-conversion module outputs an excitation signal with a frequency point within an X wave band range of 8 GHz-12 GHz, filtering the preset baseband signal through a 2.4GHz filter to obtain a preset baseband signal with a frequency point of 2.4GHz, and then mixing the preset baseband signal with the local oscillator signal to obtain a radio frequency signal of a required frequency point, wherein the frequency point of the local oscillator signal is a difference value between the frequency point of the preset baseband signal with the frequency point of 2.4GHz and the required frequency point.
6. The system of claim 5, wherein the up-conversion module further comprises a filter bank and a power adjustment module, wherein the filter bank comprises at least two filters, and the filter range of the filter bank is 2 GHz-12 GHz;
the filter is used for filtering the radio frequency signal of the required frequency point and then inputting the radio frequency signal into the power adjusting module;
the power adjusting module is used for amplifying the power of the radio frequency signal of the required frequency point after filtering, and taking the radio frequency signal of the required frequency point after power amplification as an excitation signal.
7. The system for detecting radar interference performance of multiple systems according to claim 1, further comprising a local oscillator module for providing a local oscillator signal to the down-conversion module, wherein the down-conversion module includes a power amplifier;
if the frequency point of the interference signal is below the P wave band and the L wave band of 2GHz, the interference signal is directly output as the baseband signal after being subjected to power amplification by the power amplifier;
if the frequency point of the interference signal is in the range of S wave band and C wave band of 2 GHz-8 GHz, the interference signal and the local oscillator signal are subjected to frequency mixing to obtain a baseband signal with the frequency point of 1.2GHz as output, wherein the frequency point of the local oscillator signal is the difference value between the frequency point of the interference signal and 1.2 GHz;
and if the frequency point of the interference signal is within the X wave band range of 8 GHz-12 GHz, mixing the interference signal with the local oscillator signal to obtain a 2.4GHz baseband signal as output, wherein the frequency point of the local oscillator signal is the difference value between the frequency point of the interference signal and the 2.4 GHz.
8. The system for detecting radar interference performance of claim 7, wherein the down conversion module further comprises a 1.2GHz filter, a 2.4GHz filter, a first power amplifier and a second power amplifier;
the 1.2GHz filter is used for filtering the baseband signal with the frequency point of 1.2GHz and then inputting the baseband signal into the first power amplifier;
the first power amplifier is used for performing power amplification on the filtered 1.2GHz baseband signal and outputting the power-amplified 1.2GHz baseband signal;
the 2.4GHz filter is used for filtering the baseband signal with the frequency point of 2.4GHz and then inputting the baseband signal into the second power amplifier;
and the second power amplifier is used for performing power amplification on the filtered 2.4GHz baseband signal and outputting the power-amplified 1.2GHz baseband signal.
9. The system according to claim 7, wherein the down-conversion module further includes a power amplifier, when the frequency point of the interference signal is within a range from 2GHz to 12GHz, the down-conversion module determines whether a high frequency part of the interference signal is smaller than a preset value, and if so, the interference signal is power-amplified by the power amplifier and then mixed with the local oscillator signal.
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| CN111934790B (en) * | 2020-02-28 | 2022-06-28 | 加特兰微电子科技(上海)有限公司 | Signal transmitting and receiving device, electronic device and equipment |
| CN111638493B (en) * | 2020-05-14 | 2023-04-11 | 湖北航天技术研究院总体设计所 | SAR imaging seeker interference countermeasure simulation system |
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