Radar target recognition method based on radar target range profile time-frequency feature extraction

A radar target, time-frequency feature technology, applied in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve the problems of low efficiency and low accuracy of radar target recognition

Active Publication Date: 2013-08-14
北京深蓝空间遥感技术有限公司
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Problems solved by technology

[0005] In view of the above-mentioned problems existing in the prior art, in order to solve the problems of low efficiency and low accuracy of radar target recognition in the prior art, the present invention provides a radar target recognition method based on time-frequency feature extraction of radar target range image, The radar target recognition method can be executed by computer, which helps to reduce the workload of radar target recognition observers and improve recognition efficiency. More importantly, the method can effectively improve the accuracy of radar target recognition

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Embodiment

[0111] In this embodiment, the radar target recognition method of the present invention is used to recognize five types of radar targets publicly released by MSTAR Company. These five types of radar targets are all ground military vehicles, and their radar target codes are respectively BMP2_SN9563, BTR70_SNC71, T72_SN132, D7, ZSU23_4 (for the convenience of description in the following text, the radar target codes are referred to as BMP2, BTR70, T72, D7, ZSU23 respectively ), the optical images of the five types of radar targets are as follows figure 2 As shown in (2a) to (2e), BMP2 is an infantry fighting vehicle, BTR70 is an armored personnel carrier, T72 is a tank, D7 is a bulldozer, and ZSU23 is an anti-aircraft artillery. The radar target signal is a kind of complex image data including amplitude and phase. After a series of filtering and transformation operations, it can be converted into radar target range image sequence data. Each radar target range image sequence dat...

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Abstract

The invention provides a radar target recognition method based on radar target range profile time-frequency feature extraction. The method comprises the steps that firstly a matching pursuit time-frequency analysis method is used for calculation to obtain a time-frequency distribution matrix of a radar target range profile; then a nonnegative matrix decomposition technique is used for decomposingthe time-frequency distribution matrix to obtain the time-frequency features of a time-frequency coherent structure in the high resolution range profile (HRRP) of a radar target; and finally the radar target is recognized according to a time-frequency feature extraction scheme for the radar target range profile. The radar target recognition method based on the radar target range profile time-frequency feature extraction has the advantages that the method can be executed through computer operation, the workload of observers for radar target recognition is reduced, the improvement of radar target recognition efficiency is facilitated, the nonnegative matrix decomposition technique used in the method effectively realizes the dimension reduction of the target range profile time-frequency matrix, the time phase structure scatted by the radar target is obtained through decomposition and the operational performance and the accuracy of radar target recognition can be further improved.

Description

technical field [0001] The invention belongs to the technical field of radar target recognition, in particular to a radar target recognition method based on time-frequency feature extraction of radar target range images. Background technique [0002] Radar target recognition is an important research topic in the field of national defense science and technology. Using radar target range image to carry out radar target recognition is the main way, and the key is the effective feature extraction of radar target range image. [0003] Radar target recognition is an important research topic in the field of national defense science and technology, and radar target recognition using radar target range images is the main way to realize radar target recognition. The specific method of radar target recognition using the radar target range image is usually divided into two steps: Step 1, determine the target feature extraction scheme of the radar target range image, that is, select a c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S13/89
Inventor 张新征秦建红刘书君
Owner 北京深蓝空间遥感技术有限公司
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