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Multi-channel synthetic aperture radar rpca combined amplitude-phase target detection method and device

A technology of synthetic aperture radar and target detection, which is applied in the direction of measuring devices, radio wave measuring systems, instruments, etc., can solve problems such as low efficiency, inappropriate hyperparameter parameters, and spending a lot of time iterating, so as to reduce false alarm rate and improve The effect of detecting performance and improving algorithm efficiency

Active Publication Date: 2022-01-04
SOUTHEAST UNIV +1
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Problems solved by technology

Although the standard RPCA method has the above advantages of suppressing clutter, if the value of the hyperparameters in the RPCA basic model is not appropriate, it may have a high false alarm rate (PFA) in the target detection process under low signal-to-clutter ratio conditions.
In addition, the robust principal component analysis method is less efficient and takes a lot of time iteratively to converge compared to the biased phase center antenna, space-time adaptive processing, and along-track interferometry methods

Method used

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  • Multi-channel synthetic aperture radar rpca combined amplitude-phase target detection method and device

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0034] The embodiment of the present invention considers the M-channel (M>2) synthetic aperture radar system, works in the side-view strip mode, and the signal model is as follows figure 1 shown. Suppose the velocity of the radar platform is v, and the target is on the ground at a radial velocity v r and the along-track velocity v a move. Fast time (i.e. distance time domain) and slow time (i.e. azimuth time domain) are represented by t f and t s express. According to the schematic diagram, the instantaneous slant range of point target and clutter scattering can be expressed as

[0035]

[0036]

[0037] where R 0t and R 0c Indicates the initial closest slant distance of moving targets and clutter scattering points, x 0t and x 0c are the initial azimuth positions of the moving target and the clutter scattering point, respectively, a...

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Abstract

Aiming at the multi-channel synthetic aperture radar system under the strong clutter background, the present invention combines the Robust Principal Component Analysis (RPCA) method and the amplitude-phase joint detection method to propose a multi-channel synthetic aperture radar RPCA amplitude-phase joint target detection method and device . In this method, the focused image columns of each channel are vectorized and stacked to obtain a matrix X, and then the matrix X is decomposed by the improved RPCA method to obtain a low-rank matrix L and a sparse matrix S, and finally the phase information is introduced for joint detection of amplitude and phase. The invention comprehensively considers the specific clutter and moving target information, effectively improves the moving target detection performance; fully combines the advantages of RPCA and amplitude-phase joint detection method through the two-step detection method, and reduces the false alarm rate under the condition of low signal-to-clutter ratio ; and the matrix decomposition technology adopted by the method of the present invention can greatly reduce the computational complexity and improve the algorithm efficiency.

Description

technical field [0001] The invention relates to a multi-channel synthetic aperture radar RPCA amplitude-phase combined target detection method and device, belonging to the technical field of radar imaging. Background technique [0002] Synthetic Aperture Radar (SAR) has received extensive attention in both civilian and military fields because of its all-weather and all-weather working capability. Ground Moving Target Indication (GMTI) is one of the most important tasks of SAR system for remote sensing detection, such as the detection of vehicles in traffic monitoring and the monitoring of terrorists in anti-terrorism. Usually, a weak target is likely to be submerged in a strong clutter background, which is difficult to detect in a simple way. Based on this, some traditional methods based on the multi-channel SAR (MC-SAR) system, such as the offset phase center antenna (DPCA) method, the space-time adaptive processing (STAP) method, and the along-track interferometry (ATI) m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41G01S7/02
CPCG01S13/9027G01S13/9052G01S7/415G01S7/021
Inventor 黄岩魏晨阳傅东宁徐刚蔡龙珠翟建锋于志强
Owner SOUTHEAST UNIV
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