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LFM pulse radar anti-DRFM-interference method based on moving target detection

A technology of moving target detection and pulse radar, applied in radio wave measurement systems, instruments, etc., can solve problems such as poor effect, limited interference suppression performance, and high signal-to-noise ratio requirements

Active Publication Date: 2016-04-27
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Lu Gang et al estimated the interference signal from the time-frequency decoupled signal through adaptive filtering and canceled the interference signal. Velocity-forwarding jamming is less effective
[0006] It can be seen from the above that the existing methods have limited interference suppression performance, and the implementation of most algorithms has high requirements on the signal-to-noise ratio, which is greatly affected by the signal-to-noise ratio

Method used

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  • LFM pulse radar anti-DRFM-interference method based on moving target detection
  • LFM pulse radar anti-DRFM-interference method based on moving target detection
  • LFM pulse radar anti-DRFM-interference method based on moving target detection

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Embodiment 1

[0079] combine figure 1 , the present invention is based on the LFM pulse radar anti-DRFM interference method of MTD, and the steps are as follows:

[0080] Simulation conditions: LFM pulse signal with bandwidth B=30MHz, pulse width T=0.6us, pulse repetition period Tr=13us, 1 CPI contains 256 PRIs, the number of sampling points in each PRI is 680, the target distance is 800m, and the speed is 300m / s, the signal-to-noise ratio is 10dB, the distance of the DRFM interference signal is 830m, the speed is 270m / s, the interference-to-signal ratio is 10dB, and the interference phase quantization number M is 3 bits.

[0081] The obtained echo signal containing target and DRFM interference is as follows: figure 2 In (b) shown.

[0082] In the first step, pulse pressure processing and MTD processing are performed on the echo, and the result of MTD processing is x MTD ,Such as image 3 As shown, perform a peak search, where f corresponds to the Doppler dimension, t corresponds to t...

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Abstract

The invention discloses an LFM pulse radar anti-DRFM-interference method based on moving target detection. The LFM pulse radar anti-DRFM-interference method utilizes the characteristic of MTD that energy of target and interference echoes is concentrated respectively, two kinds of echo information are sorted out according to peak values, time-domain signals are restored through inverse MTD processing and inverse pulse compression processing respectively, and target and interference discrimination is achieved by utilizing the characteristic of DRFM phase quantization. The LFM pulse radar anti-DRFM-interference method has the advantages that: the performance is stable under the condition of low signal-to-noise ratio; and the probability of accurately discriminating target and interference reaches up to 100% when the signal-to-noise ratio is greater than -15dB and DRFM interference quantization bits are less than or equal to 3.

Description

technical field [0001] The invention belongs to the technical field of radar anti-jamming, in particular to a method for anti-jamming of a digital radio frequency memory (Digital Radio Frequency Memory, DRFM) of a linear frequency modulation (Linear Frequency Modulation, LFM) pulse radar based on moving target detection. Background technique [0002] Coherent jamming requires that the jamming signal is an accurate simulation of the radar waveform, which is mainly realized by DRFM at present. The DRFM-based jamming system intercepts the LFM pulse radar transmission signal, collects and stores it after down-conversion, reads it out at an appropriate time, converts it into an analog signal through D / A, and then up-converts it into a radio frequency signal. Under certain conditions, the jamming signal reconstructed by DRFM is an exact replica of the radar signal, so it can produce effective deception jamming. [0003] Since the DRFM interference signal is obtained from the inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 张仁李奚舒靓盛卫星马晓峰韩玉兵
Owner NANJING UNIV OF SCI & TECH
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