Simulation device for radar interference signal generation and suppression

Abstract

The utility model relates to a simulation device for radar interference signal generation and suppression, belongs to the technical field of radar interference countermeasure, and solves the problems that the existing radar interference and suppression simulation device is incomplete in function and poor in simulation effect. The device comprises a receiving antenna, a band-pass filter, a low-noise amplifier and a DRFM interference simulator which are connected in sequence and are used for generating an interference signal; the pulse partitioning unit is connected with the DRFM interference simulator and outputs a plurality of sub-signals to the matched filter bank; the matched filter bank is connected with the pulse blocking unit and outputs a filtering result of the sub-signal with the minimum amplitude to the interference identification unit; the interference identification unit is connected with the matched filter bank, obtains an interference identification result and transmits the interference identification result to the target detection unit; the target detection unit is connected with the interference identification unit and detects the target. And integrated implementation of simulation radar interference and suppression is realized.

Description

Technical Field

[0001] This utility model relates to the field of radar jamming countermeasures technology, and in particular to a simulation device for generating and suppressing radar jamming signals. Background Technology

[0002] With the continuous advancement of science and technology, radar has also achieved rapid development. Wideband radar, as a commonly used type of new radar system, holds an important position. Effectively jamming it and reducing or disrupting its tracking and identification capabilities is a research hotspot in the electronics field both domestically and internationally.

[0003] Intermittent sampling-forward jamming, as a novel jamming technique, has attracted significant attention in the field of radar jamming countermeasures in recent years due to its advantages such as fast response speed, low hardware resource requirements, flexible forwarding methods, and the ability to use shared transmit and receive antennas. As the deceptive nature of intermittent sampling-forward jamming continues to improve, techniques for suppressing it warrant further exploration.

[0004] There is a lack of integrated real-time simulation devices that can simulate the generation of radar interference signals based on intermittent sampling and forwarding interference patterns, and can also efficiently identify and effectively suppress them, thereby realizing signal detection and processing. Utility Model Content

[0005] Based on the above analysis, the present invention aims to provide a simulation device for generating and suppressing radar interference signals, in order to solve the problems of incomplete functionality and poor simulation effect of existing radar interference and suppression simulation devices.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] A simulation device for generating and suppressing radar jamming signals includes: a receiving antenna, a bandpass filter, a low-noise amplifier, and a DRFM jamming simulator connected in sequence to generate jamming signals; a pulse segmentation unit connected to the DRFM jamming simulator, which outputs multiple sub-signals to a matched filter bank; a matched filter bank connected to the pulse segmentation unit, which outputs the filtered result of the sub-signal with the smallest amplitude to an jamming identification unit; a jamming identification unit connected to the matched filter bank, which acquires the jamming identification result and transmits it to a target detection unit; and a target detection unit connected to the jamming identification unit, which detects the target.

[0008] Based on further improvements to the above scheme, the DRFM interference simulator includes a downconverter, an analog-to-digital converter, a memory, a digital-to-analog converter, and an upconverter connected in sequence.

[0009] Based on further improvements to the above scheme, the DRFM interference simulator also includes a controller connected to an analog-to-digital converter, a memory, and a digital-to-analog converter.

[0010] Based on the further improvement of the above scheme, the interference identification unit has two input terminals and two output terminals. One input terminal is connected to the output terminal of the matched filter bank, and the other input terminal is connected to one of its own output terminals; the other output terminal is connected to the target detection unit.

[0011] Based on the further improvement of the above scheme, the pulse segmentation unit includes a segmentation orthogonal component and a phase-frequency composite coding component connected to the segmentation orthogonal component.

[0012] Based on the above scheme, the number of matched filters in the matched filter bank is the same as the number of output terminals of the block orthogonal component.

[0013] Based on the further improvement of the above scheme, the target detection unit is a CFAR detector.

[0014] Based on further improvements to the above scheme, CFAR detectors include the cell average detector CA-CFAR, the maximum selection detector GO-CFAR, the minimum selection detector SO-CFAR, and the ordered statistical detector OS-CFAR.

[0015] Based on further improvements to the above scheme, the device also includes a data processor connected to the target detection unit and a display screen connected to the data processor.

[0016] Based on further improvements to the above scheme, the data processor includes a sidelobe canceller and a Doppler filter bank connected in sequence.

[0017] Compared with existing technologies, this invention achieves at least one of the following beneficial effects: it integrates the entire process from signal reception and processing to detection, simulating actual radar interference and suppression processes, and providing a comprehensive simulation device for the design and testing of radar systems; by simulating complex interference signals through the DRFM interference simulator, it helps to test and evaluate the performance of radar systems in the face of advanced interference technologies; the pulse segmentation unit divides the signal into multiple sub-signals and processes them through multiple matched filters, and this parallel processing method improves the system's processing power and efficiency; the interference identification unit continuously learns and adapts to new interference characteristics through its own feedback mechanism, improving the accuracy of interference signal identification; the simulation device has the ability to simulate real-time signal processing, and can evaluate the performance of the radar system in real-time operation.

[0018] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0020] Figure 1 This is a schematic diagram of a simulation device for generating and suppressing radar interference signals in an embodiment of this utility model. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0022] A specific embodiment of this utility model discloses a simulation device for generating and suppressing radar interference signals, such as... Figure 1 As shown, it includes:

[0023] A receiving antenna, a bandpass filter, a low-noise amplifier, and a DRFM interference simulator are connected in sequence to generate interference signals. A pulse segmentation unit is connected to the DRFM interference simulator and outputs multiple sub-signals to a matched filter bank. The matched filter bank is connected to the pulse segmentation unit and outputs the filtered result of the sub-signal with the smallest amplitude to the interference identification unit. The interference identification unit is connected to the matched filter bank and obtains the interference identification result, which is then transmitted to the target detection unit. The target detection unit is connected to the interference identification unit and performs target detection.

[0024] Specifically, the receiving antenna receives the intercepted radar transmission signal; the bandpass filter is connected to the receiving antenna to obtain a specific frequency band signal from the radar transmission signal; the low-noise amplifier is connected to the bandpass filter to obtain a high signal-to-noise ratio radio frequency signal; and the DRFM jamming simulator is connected to the low-noise amplifier to generate jamming signals using an intermittent sampling and forwarding jamming method.

[0025] It should be noted that the DRFM (Digital Radio Frequency Memory) interference simulator includes a downconverter, an analog-to-digital converter, a memory, a digital-to-analog converter, and an upconverter connected in sequence, as well as a controller connected to the analog-to-digital converter, the memory, and the digital-to-analog converter.

[0026] Specifically, the downconverter processes the radio frequency (RF) signal into an intermediate frequency (IF) signal; the analog-to-digital converter (ADC) samples, quantizes, and encodes the processed IF signal, converting the analog signal into a digital signal; the memory stores the results; the digital-to-analog converter (DAC) functions in the opposite way, converting the converted digital signal back into an analog signal; and the upconverter converts the analog IF signal into a high-frequency RF signal. The controller, as the main control unit of the DRFM interference simulator, enables the various modules to work collaboratively under the command of clock pulses.

[0027] Furthermore, the pulse segmentation unit receives the jammed radar signal generated by the DRFM jamming simulator, which includes a segmented orthogonal component and a phase-frequency composite coding component connected to the segmented orthogonal component.

[0028] It should be noted that the block orthogonal component divides the radar transmitted signal pulse into blocks according to the sampling period of the intermittent sampling and forwarding interference, resulting in multiple sub-signals with the same period. These sub-signals are orthogonal to each other. The phase-frequency composite coding component is used to design these sub-signals.

[0029] Because phase-coded signals suffer from small Doppler tolerance, they have significant detection loss for moving targets. At the same time, their bandwidth is limited by their symbol width, making them difficult to modulate. Frequency-coded signals, on the other hand, have a large equivalent bandwidth and relatively simple spectral modulation, making them easy for the enemy to detect and interfere with. Therefore, the phase-frequency composite coding component focuses on the mismatch between the interference signal and the radar transmitted signal after intermittent sampling and forwarding. The composite modulated signal combines the advantages of both coding methods, improving the radar's anti-interference performance while ensuring the accuracy of radar ranging and velocity measurement.

[0030] Furthermore, the multiple sub-signals with interference are respectively passed to the connected matched filter bank, that is, the number of matched filters in the matched filter bank is the same as the number of output terminals of the block orthogonal component.

[0031] Preferably, the block orthogonal component outputs three sub-signals, and the matched filter bank has three matched filters, each receiving one sub-signal.

[0032] Multiple matched filters in the matched filter bank filter each sub-signal to obtain their respective filtering results. The matched filtering result of the sub-signal with the smallest amplitude is selected from the multiple filtering results and output to the interference identification unit for interference identification, thus obtaining the interference identification result.

[0033] Preferably, the interference identification result is fed back to the interference identification unit, where it continues to be used for interference identification together with the matched filtering result of the determined sub-signal with the smallest amplitude. Therefore, the interference identification unit has two input terminals and two output terminals. One input terminal is connected to the output terminals of multiple matched filters, and the other input terminal is connected to one of its own output terminals; the other output terminal is connected to the target detection unit. Through this feedback mechanism, the interference identification unit continuously learns and adapts to new interference characteristics, thereby improving the accuracy of interference signal identification.

[0034] Furthermore, the target detection unit is a CFAR (Constant False Alarm Rate Detector), which includes the cell average detector CA-CFAR, the maximum selector detector GO-CFAR, the minimum selector detector SO-CFAR, and the ordered statistical detector OS-CFAR.

[0035] Furthermore, the apparatus of this embodiment also includes a data processor connected to the target detection unit and a display screen connected to the data processor.

[0036] It should be noted that the data processor includes a sidelobe canceller and a Doppler filter bank connected in sequence. The sidelobe canceller is used to reduce sidelobe effects in the radar signal, while the Doppler filter bank is used to distinguish between stationary and moving targets, enabling more accurate detection and tracking of moving targets. The data processor is used to evaluate the performance of the radar system in real-time operation.

[0037] Finally, the processing results of the data processor are displayed on a screen.

[0038] Compared with existing technologies, the radar jamming signal generation and suppression simulation device provided in this embodiment integrates the entire process from signal reception, processing to detection, and can simulate the actual radar jamming and suppression process, providing a comprehensive simulation device for the design and testing of radar systems. Simulating complex jamming signals using the DRFM jamming simulator helps test and evaluate the performance of radar systems in the face of advanced jamming technologies. The pulse segmentation unit divides the signal into multiple sub-signals and processes them through multiple matched filters; this parallel processing method improves the system's processing power and efficiency. The jamming identification unit continuously learns and adapts to new jamming characteristics through its own feedback mechanism, improving the accuracy of jamming signal identification. The simulation device has the ability to simulate real-time signal processing, enabling real-time evaluation of the radar system's performance in real-time operation.

[0039] Those skilled in the art will understand that the programs / software involved in the pulse segmentation unit, interference identification unit, and target detection unit in the above embodiments are common methods in the prior art, and this utility model does not involve any software improvements. This utility model only requires connecting the various devices with corresponding functions through the connection relationships given in the embodiments of this utility model, which does not involve any program or software improvements. As for the connection methods between the various hardware devices with corresponding functions, they can all be implemented by those skilled in the art using existing technology, and will not be described in detail here.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A simulation device for generating and suppressing radar interference signals, characterized in that, include: The receiving antenna, bandpass filter, low-noise amplifier, and DRFM interference simulator are connected in sequence to generate interference signals. The pulse segmentation unit is connected to the DRFM interference simulator and outputs multiple sub-signals to the matched filter bank; the matched filter bank is connected to the pulse segmentation unit and outputs the filtered result of the sub-signal with the smallest amplitude to the interference identification unit; the interference identification unit is connected to the matched filter bank and obtains the interference identification result and transmits it to the target detection unit. The target detection unit is connected to the interference identification unit to detect the target.

2. The simulation device for generating and suppressing radar interference signals according to claim 1, characterized in that, The DRFM interference simulator includes a downconverter, an analog-to-digital converter, a memory, a digital-to-analog converter, and an upconverter connected in sequence.

3. The simulation device for generating and suppressing radar interference signals according to claim 2, characterized in that, The DRFM interference simulator also includes a controller connected to an analog-to-digital converter, a memory, and a digital-to-analog converter.

4. The simulation device for generating and suppressing radar interference signals according to claim 1, characterized in that, The interference identification unit has two input terminals and two output terminals. One input terminal is connected to the output terminal of the matched filter bank, and the other input terminal is connected to one of its own output terminals; the other output terminal is connected to the target detection unit.

5. The simulation device for generating and suppressing radar interference signals according to claim 1, characterized in that, The pulse segmentation unit includes a segmentation orthogonal component and a phase-frequency composite encoding component connected to the segmentation orthogonal component.

6. The simulation device for generating and suppressing radar interference signals according to claim 5, characterized in that, The number of matched filters in the matched filter bank is the same as the number of output terminals of the block orthogonal component.

7. The simulation device for generating and suppressing radar interference signals according to claim 1, characterized in that, The target detection unit is a CFAR detector.

8. The simulation device for generating and suppressing radar interference signals according to claim 7, characterized in that, The CFAR detectors include the cell average detector CA-CFAR, the maximum selection detector GO-CFAR, the minimum selection detector SO-CFAR, and the ordered statistical detector OS-CFAR.

9. The simulation device for generating and suppressing radar interference signals according to claim 1, characterized in that, The device also includes a data processor connected to the target detection unit and a display screen connected to the data processor.

10. The simulation device for generating and suppressing radar interference signals according to claim 9, characterized in that, The data processor includes a sidelobe canceller and a Doppler filter bank connected in sequence.

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