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Main lobe intermittent sampling and forwarding interference resisting method based on low-rank sparse model

A technology of forwarding interference and sparse models, applied in radio wave measurement systems, complex mathematical operations, instruments, etc., can solve the problems of difficult separation of interference signals and target signals, and difficult detection and tracking of real targets in radar systems, so as to achieve suppression of gap sampling Forwarding interference, complete suppression effect, and reduced coupling effect

Pending Publication Date: 2021-11-12
XIDIAN UNIV
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Problems solved by technology

[0005] In order to solve the problem that the interference signal and the target signal are highly coupled and difficult to separate in the time-frequency and frequency domains, which makes it difficult for the radar system to detect and track the real target

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  • Main lobe intermittent sampling and forwarding interference resisting method based on low-rank sparse model
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  • Main lobe intermittent sampling and forwarding interference resisting method based on low-rank sparse model

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0050] 1. Intermittent sampling and forwarding interference signal model

[0051] The DRFM jammer performs intermittent sampling, copying and forwarding of the intercepted radar transmission signal, and then uses the matched filter characteristics of the pulse pressure radar to generate intermittent sampling and forwarding interference with the effect of coherent false target string interference. Here we ta...

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Abstract

The invention relates to a main lobe intermittent sampling and forwarding interference resisting method based on a low-rank sparse model, and belongs to the field of radar signal processing. The method comprises the following steps: firstly, converting N echo signals mixed with ISJs in a CPI into a time-frequency domain by using short-time Fourier transform STFT, and constructing a time-frequency image sequence of the CPI; then, utilizing an RPCA low-rank sparse decomposition algorithm to decompose the image sequence, and separating out a low-rank target and sparse interference; and finally, recovering the separated target signal time-frequency sequence by using a time-frequency recovery algorithm to obtain a time-domain signal after interference suppression. According to the method, the gap sampling forwarding interference is effectively suppressed, so that the coupling between the interference and the target in the time domain and the frequency domain is greatly reduced, a real target signal becomes clear and visible, the reduction degree of the waveform signal of the target is relatively high, and the relatively remarkable linear frequency modulation signal can still be observed from the time domain and the frequency domain.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a low-rank sparse model-based anti-jamming method for intermittent sampling and forwarding of the main lobe, which can be used in a radar system to fight against interference from the intermittent sampling and forwarding type. Background technique [0002] Intermittent sampling and forwarding interference generated by jammers based on digital radio frequency memory will not only seriously congest radar transmission signals in the signal time domain, frequency domain, and even time-frequency domain, but also form different concurrent Has a deceptive and oppressive double distraction effect. In addition, intermittent sampling and forwarding interference can achieve interference performance on radars whose transmitted signals are linear frequency modulation signals, phase coding, and step frequency hopping. With the improvement of forwarding methods and modulation ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G06F17/14
CPCG01S7/36G06F17/14Y02D30/70
Inventor 李亚超张鹏彭成郭亮陶慧斌邵学辉张彬李丝丝
Owner XIDIAN UNIV
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