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Multichannel clutter suppression method based on robust principal component analysis

A technique of principal component analysis and clutter suppression, which is applied in the radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve target self-cancellation, poor practicability, and wrong selection of moving target data training Samples and other issues to achieve the effect of reducing system complexity, improving detection performance, and avoiding data traversal

Active Publication Date: 2014-07-02
XIDIAN UNIV
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Problems solved by technology

[0004] However, most of the above methods are based on the accurate estimation of the clutter covariance matrix
However, in the actual echo data, since the energy of the moving target is small and the energy of the clutter is large, the situation that the moving target is submerged in the strong clutter background often occurs
In this environment, the information of the moving target cannot be obtained effectively, so that the data of the moving target is wrongly selected as the training sample, which eventually leads to a decrease in the output signal-to-interference-noise ratio, and even the self-cancellation phenomenon of the target.
In order to better select suitable training samples, most of the existing methods based on generalized inner product and power selection are based on data domain processing, that is, different objective functions and thresholds are set to determine where the target may be contained, and then remove it. , making the above method less practical and more complex

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  • Multichannel clutter suppression method based on robust principal component analysis
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  • Multichannel clutter suppression method based on robust principal component analysis

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[0041] The present invention will be further described below in conjunction with accompanying drawing:

[0042] refer to figure 1 , is a flowchart of a multi-channel clutter suppression method based on the robust principal component analysis method of the present invention. The multi-channel clutter suppression method based on the robust principal component analysis method includes the following steps:

[0043] S1: Use each receiving channel of the radar to receive echo data, and perform range pulse compression processing and range migration correction on each echo data in turn to obtain a corresponding range-Doppler image. In the embodiment of the present invention, the radar is an airborne synthetic aperture radar. There are M evenly arranged receiving channels on the radar, each receiving channel of the radar is arranged linearly, and the distance between two adjacent receiving channels is d. When the radar is working, it first sends out signals, and then uses each recei...

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Abstract

The invention belongs to the technical field of multichannel clutter suppression, and particularly relates to a multichannel clutter suppression method based on robust principal component analysis. The multichannel clutter suppression method based on the robust principal component analysis comprises the following steps of obtaining a distance-Doppler image corresponding to each reception channel of radar; obtaining corresponding distance-Doppler data according to each distance-Doppler image; conducting column vectorization on distance-Doppler data matrices, and combining all column vectors into a matrix X; decomposing the matrix X through the robust principal component analysis so as to obtain a corresponding sparse matrix S0; according to the sparse matrix S0, obtaining 1 to m, wherein 1 to m are submatrices of X1 to Xm; according to 1 to m, obtaining the optimal weight wopt,j corresponding to a jth Doppler unit; conducting clutter suppression according to the optimal weight corresponding to each Doppler unit, and obtaining a result Xout after clutter suppression.

Description

technical field [0001] The invention belongs to the technical field of multi-channel clutter suppression, in particular to a multi-channel clutter suppression method based on a robust principal component analysis method. Background technique [0002] Synthetic aperture radar and moving target detection (SAR / GMTI) technology has important use value and broad application prospects in military and civilian applications, and is a hot field of radar technology research in all countries in the world. Compared with the single-channel SAR-GMTI system, the multi-channel SAR-GMTI system can effectively suppress clutter and realize the detection of slow moving targets under low signal-to-noise ratio. At present, signal processing methods based on multi-channel SAR-GMTI systems, such as Displaced Phased Center Antenna (DPCA: Displaced Phased Center Antenna), Space-Time Adaptive Processing (STAP: Space-Time Adaptive Processing) and other methods, have good heterogeneity. Wave suppressio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/2928G01S7/414G01S13/9029G01S13/9027
Inventor 廖桂生杨东朱圣棋高永婵张学攀粟嘉
Owner XIDIAN UNIV
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