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Polarization discrimination method for active false target in main lobe suppressing interference background

A technology for suppressing interference and polarization identification, applied in the field of identification of active false targets, which can solve the problems of difficult identification of false targets, difficulty in association, tracking of real targets, etc.

Active Publication Date: 2016-12-21
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] However, in practice, the interference environment faced by radars often appears in the form of more complex combined interference. The combination of suppression interference and spoofing interference is an important interference environment faced by radars. An important form is main lobe suppression interference and active The essence of the combination of false target interference is that it is difficult for the radar to accurately identify false targets under low signal-to-interference-noise ratio (SINR, Signal Interference Noise Ratio, that is, the power ratio of signal to interference and noise), and then it is difficult to associate and track real targets.

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  • Polarization discrimination method for active false target in main lobe suppressing interference background
  • Polarization discrimination method for active false target in main lobe suppressing interference background
  • Polarization discrimination method for active false target in main lobe suppressing interference background

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Embodiment Construction

[0057] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0058] figure 1 It is a schematic diagram of the radar transmitting signal involved in the present invention. In the figure, the H channel and the V channel respectively represent the H polarization transmission channel and the V polarization transmission channel of the radar. The transmission signals of the two channels are composed of M seamlessly connected sub-pulses (represented by rectangular boxes in the figure). The pulse waveforms are all s(t) and the width is Δt. The relative phase difference of the transmitting signals of the H-polarized transmitting channel and the V-polarized transmitting channel on the mth sub-pulse is m=1,...,M.

[0059] figure 2 It is a schematic diagram of the signal processing flow involved in the method proposed by the present invention. As shown in the figure, after the received signals of the H polarization chan...

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Abstract

The invention provides a polarization discrimination method for active false targets in a main lobe suppressing interference background. The polarization discrimination method comprises the steps of: receiving signals by using an H polarization channel and a V polarization channel of a radar, carrying out matched filtering according to sub-pulse waveforms at first after synchronous sampling, carrying out interference polarization estimation and polarization cancellation on the two paths of output signals, processing one path of output signal by adopting an M point sliding window method to realize non-coherent accumulation and further adopting a CFAR method to realize target detection, extracting target features of a detected sampling position, and carrying out discrimination of real and false target attributes by utilizing the features. According to the polarization discrimination method, the radar adopts a transmission variable polarization method, and can perform active false target discrimination through extracting signal amplitude variation features.

Description

technical field [0001] The invention belongs to the technical field of radar anti-interference, and mainly solves the problem of identification of active false targets under the background of main-lobe suppressed interference by radar. Background technique [0002] Suppressing interference is generally to form strong interference by applying high-power noise (or noise-like) signals to submerge the target echo signal in the opponent's radar receiver, so as to disrupt and destroy the radar target detection link. The main lobe suppression interference is the suppression interference that enters from the main lobe of the radar. This type of interference is in the same or similar direction as the radar target. When the radar detects the target, it enters the radar receiver from the main lobe of the radar antenna, so the receiving gain is relatively larger (compared to the side lobe Interference average about 30 ~ 40dB), the threat is more serious. For the main lobe suppression i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 施龙飞宗志伟李永祯王雪松肖顺平杨勇马佳智毛楚乔胥文泉
Owner NAT UNIV OF DEFENSE TECH
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