Synthetic aperture radar interference suppression method based on tensor low-rank approximation

A synthetic aperture radar and interference suppression technology, applied in the field of signal processing, can solve problems such as low computing efficiency and failure to consider azimuth echo coupling correlation characteristics, etc., to achieve the effect of ensuring interference separation performance, improving image quality, and improving computing efficiency

Active Publication Date: 2020-07-10
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The above method processes single azimuth echoes at a specific time one by one, adopts matrix algebra optimization solution, the calculation efficiency is low, and does not consider the coupling correlation characteristics between azimuth echoes at different times

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  • Synthetic aperture radar interference suppression method based on tensor low-rank approximation
  • Synthetic aperture radar interference suppression method based on tensor low-rank approximation
  • Synthetic aperture radar interference suppression method based on tensor low-rank approximation

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] The concrete steps of the technical solution adopted by the present invention to solve the technical problems are as follows:

[0029] Step 1: The original echo matrix X received by SAR is expressed as the superposition of useful signal matrix S, interference matrix I and system noise matrix N:

[0030] X(n,m)=S(n,m)+I(n,m)+N(n,m) (1)

[0031] Among them, X(n,m), S(n,m), I(n,m), N(n,m) respectively represent the nth of the original echo matrix, useful signal matrix, interference matrix and system noise matrix Row, m-th column element, where 1≤n≤N and 1≤n≤M, n represents the fast time discrete sampling point, m represents the slow time sampling point, N is the total number of fast time discrete sampling points, M is the slow time discrete sampling point total number of points;

[0032] Step 2: Perform short-time Fourier transform on each column...

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Abstract

The invention provides a synthetic aperture radar interference suppression method based on tensor low-rank approximation. Correlation coupling between low rank of interference in a time-frequency representation space and azimuth echoes is deeply mined. A two-dimensional radar echo is constructed into a three-order frequency-time-azimuth tensor, the tensor low-rank approximation technology is combined, the energy of interference is estimated through alternating least square optimization iteration, and effective separation of the interference and a target echo is achieved in a tensor representation space. According to the invention, the tensor low-rank approximation technology is utilized to realize effective separation of interference and target echo, so as to improve image imaging quality.Compared with a traditional method for processing single azimuth echoes one by one at a specific moment, iterative optimization solving is conducted by comprehensively utilizing the low rank performance of the time-frequency space and the coupling relevance of the azimuth space, the interference separation performance can be guaranteed, and meanwhile the operation efficiency is improved.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for suppressing radar interference in the field of radar signal processing. The invention is suitable for processing the time-varying interference of azimuth, can effectively retain useful echo signals, and realizes clear imaging of radar echo signals. Background technique [0002] Synthetic Aperture Radar (SAR), as an active microwave target detection device, has the advantages of all-day, all-weather and long range, and is widely used in military and civilian fields. High-resolution imaging needs to transmit a signal with a large bandwidth, which is easily interfered by other radio equipment sharing the same frequency band. The existence of strong interference will cause the amplitude, phase, frequency and polarization of the echo signal to be distorted, which not only increases the difficulty of parameter estimation in the imaging process, but also makes the SAR imag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292G01S7/295G01S13/90
CPCG01S7/2923G01S7/295G01S13/9017G01S13/90
Inventor 陶明亮李劼爽粟嘉范一飞王伶张兆林韩闯宫延云
Owner NORTHWESTERN POLYTECHNICAL UNIV
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