Intermittent Sampling Retransmission Interference Suppression Method Based on Cognitive Radar Waveform
A technology of cognitive radar and forwarding interference, applied in radio wave measurement systems, instruments, etc., can solve problems such as target detection performance degradation, and achieve the effect of improving detection performance
Active Publication Date: 2019-07-02
NAT UNIV OF DEFENSE TECH
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[0005] The present invention provides a method for suppressing intermittent sampling and forwarding interference based on cognitive radar waveform design. The method estimates the sampling pulse width and forwarding period of intermittent sampling and forwarding interference based on the chirp signal emitted by cognitive radar, and then according to the estimated Sampling pulse width and forwarding cycle transmit specific intra-pulse FM signal, and finally remove the interference part in the radar echo signal, which can effectively solve the problem of real target detection performance degradation when suppressing intermittent sampling and forwarding interference
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[0031] The present invention will be further described below in conjunction with the drawings.
[0032] figure 1 It is a flow chart of the intermittent sampling and forwarding interference suppression method based on cognitive radar waveform design, including two steps: the first step is the intermittent sampling and forwarding interference parameter estimation, which mainly includes ①transmitting chirp signals, ②receiving interference echo signals, ③interference There are three sub-steps for parameter estimation; the second step is intermittent sampling and forwarding interference suppression, which mainly includes three sub-steps: ①generating and transmitting intra-pulse FM signals, ②receiving interference echo signals, and ③interference suppression. Splicing processing refers to removing the discrete points where the discrete signal is zero. For example, the result of splicing signal [0,1,0,0,1,2,0,3] is [1,1,2,3].
[0033] In order to illustrate the effectiveness of the present...
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The invention provides an intermittent sampling forwarding interference suppression method based on a cognitive radar waveform. The technical scheme comprises the following steps: the first step of intermittent sampling forwarding interference parameter estimation, a cognitive radar emits a linear frequency modulation pulse signal firstly, an echo signal is analyzed, and an estimation value of a sampling pulse width and an estimation value of a forwarding period are obtained; and the second step of intermittent sampling forwarding interference suppression, the cognitive radar emits a specific intra-pulse frequency modulation signal, interference interval signal zero setting is performed on a received radar echo signal, splicing is performed then, and matching filtering is performed on the signal to obtain a pulse pressure result of a jammer Real target detection performance can be effectively improved, and intermittent sampling forwarding interferences in direct forwarding, repeated forwarding and other forwarding modes are achieved.
Description
Technical field [0001] The invention belongs to the technical field of anti-radar active interference, and specifically relates to an intermittent sampling and forwarding interference suppression method based on cognitive radar waveforms. Background technique [0002] Intermittent sampling and forwarding interference is an efficient active interference pattern that has developed rapidly in recent years. This jamming pattern can make the radar end form a series of false targets distributed before and after the jammer body by intermittently sampling and forwarding a single pulse signal of the chirp radar, and has the effect of deception and suppression. Therefore, from the perspective of radar anti-interference, it is necessary to rapidly develop methods for identifying and suppressing intermittent sampling and forwarding interference. [0003] In his doctoral dissertation "Research on Active Interference Countermeasures for Wideband LFM Radar" (National University of Defense Techno...
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IPC IPC(8): G01S7/36G01S7/02
CPCG01S7/023G01S7/36
Inventor 刘振谌睿隋金坪魏玺章
Owner NAT UNIV OF DEFENSE TECH