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Sea surface micro-motion target detection and characteristic extraction method based on morphological component analysis

A morphological component analysis, micro-moving target technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as estimation performance limitations, and achieve the effect of improving signal-to-noise ratio and suppressing sea clutter.

Active Publication Date: 2014-09-17
NAVAL AVIATION UNIV
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Problems solved by technology

[0004] Signal time-frequency processing methods (such as short-time Fourier transform, wavelet transform, Winger-Ville transform, fractional Fourier transform, etc.) have incomparable advantages as fretting feature analysis tools, but the estimation performance is limited by the time-frequency resolution

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  • Sea surface micro-motion target detection and characteristic extraction method based on morphological component analysis

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with accompanying drawing 1 of the description. With reference to accompanying drawing 1 of specification sheet, processing flow of the present invention divides the following steps:

[0026] (1) Sparse representation of sea clutter;

[0027] (2) Sea clutter sparse domain suppression;

[0028] (3) The echo signal of the micro-moving target is sparsely represented;

[0029] (4) Micro-motion target signal sparse field detection;

[0030] (5) Estimation of fretting characteristic parameters.

[0031] The present invention will be described in further detail below in conjunction with accompanying drawing 2 of the description. With reference to accompanying drawing 2 of specification sheet, the specific embodiment of the present invention divides the following steps:

[0032] (1) Send the radar echo in the same distance unit obtained after the amplification and demodulation processing into th...

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Abstract

The invention relates to a sea surface micro-motion target detection and characteristic extraction method based on morphological component analysis, which belongs to the technical field of radar signal treatment and detection. The method disclosed by the invention comprises the following steps: 1) sea clutter sparse representation; 2) sea clutter sparse domain inhibition; 3) the sparse representation of a micro-motion target echo signal; 4) micro-motion target signal sparse domain detection; and 5) micro-motion characteristic parameter estimation. Compared with the traditional sea surface target detection method, the sea surface micro-motion target detection and characteristic extraction method disclosed by the invention is characterized in that the morphological difference between the sea clutter and a micro-motion target echo signal composition is fully utilized, different source signals are subjected to sparse representation by different dictionaries, and the sea surface micro-motion target detection and characteristic extraction method has the capability on distinguishing the sea clutter and the micro-motion target, more signal energy is accumulated while the sea clutter is inhibited, and the signal to clutter ratio is improved. The sea surface micro-motion target detection and characteristic extraction method also has the capability on detecting the micro-motion target and estimating the micro-motion characteristic parameter in the strong sea clutter, provides a new path for sea surface weak target detection and characteristic extraction, and has a popularization and application value.

Description

1. Technical field [0001] The invention belongs to the technical field of radar signal processing and detection, in particular to the moving target detection technology of sea detection radar. 2. Background technology [0002] The detection technology of weak targets in sea clutter, especially "low (low grazing angle), slow (stationary or slow moving), small (small target size)" targets has always been a difficult problem in the field of radar signal processing, not only of theoretical importance It plays a very important role in both military and civilian use, such as the detection of sea surface targets in the safe navigation of ships, ice floes avoidance, and monitoring of the marine environment. The common feature of weak targets in sea clutter is that due to factors such as low radar resolution, long distance, and strong background, the signal-to-noise (SNR) ratio in the target resolution unit is very low no matter in the time domain or in the frequency domain. The clu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 陈小龙关键柴勇王国庆宋杰黄勇蔡复青何友
Owner NAVAL AVIATION UNIV
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