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Target micro-motion feature extraction method used for estimating space warhead procession period

A precession cycle and feature extraction technology, applied in the field of radar target detection and recognition, to achieve good anti-false extreme point anti-jamming, accurate target feature extraction results, and good robustness

Active Publication Date: 2016-06-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the case of non-sinusoidal time-frequency curve characteristics exhibited by the scattering point at the ring of the warhead target, using the cyclic amplitude difference matrix and the average cyclic amplitude difference coefficient to complete the accurate estimation of the precession period of the warhead target

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  • Target micro-motion feature extraction method used for estimating space warhead procession period
  • Target micro-motion feature extraction method used for estimating space warhead procession period
  • Target micro-motion feature extraction method used for estimating space warhead procession period

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Embodiment Construction

[0023] Attached below Figure 1-5 The present invention is further described. Proceed as follows:

[0024] In the first step, the short-time Fourier transform is performed on the warhead target echo. The scattering at the target ring of the precessing warhead is sliding type scattering, such as figure 1 As shown, in the coordinate system O-xyz (O is the center of mass of the warhead and the center of the coordinate system, x is the horizontal axis, y is the vertical axis, and z is the vertical axis), the warhead precesses around the z-axis with O as the fulcrum, and the precession Period is f d is the precession frequency, and the precession angle is θ. According to the characteristics of the radar target, the warhead echo is mainly composed of echoes from five strong scattering points A, B, C, D and E. According to the form of discrete Fourier transform, the time-frequency two-dimensional matrix of warhead target precession echo is calculated as

[0025] ...

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Abstract

The invention provides a target micro-motion feature extraction method used for estimating a space warhead procession period. The technical effect that the warhead target procession period is accurately estimated through a cyclic magnitude difference matrix and an average cyclic magnitude difference coefficient under the condition of non-sinusoidal time-frequency curve characteristics presented by scattering points in a warhead target circular ring. The method is implemented in the following steps that firstly, a warhead procession echo time-frequency two-dimensional matrix is obtained; secondly, the cyclic magnitude difference matrix is calculated; thirdly, the average cyclic magnitude difference coefficient is calculated; and fourthly, the warhead procession period is estimated. The target micro-motion feature extraction method has good robustness on non-ideal factors such as non-sinusoidal curves, multi-component coupling and discontinuous time-frequency curves, and the precision of estimated results of the warhead target procession period is quite high.

Description

【Technical field】 [0001] The invention belongs to the field of radar target detection and recognition, and in particular relates to radar target micro-motion feature analysis and extraction technology, in particular to a target micro-motion feature extraction method for estimating the space warhead precession period. 【Background technique】 [0002] The micro-motion characteristics of the target reflect the electromagnetic scattering characteristics, geometric structure characteristics and motion characteristics of the target. To keep the warhead stable during space flight, attitude control technology is generally required, resulting in the warhead target often precessing at a small angle while moving macroscopically, while other space targets such as debris and decoys accompanying the warhead flight Since there is no attitude control, there will be random rolling, swinging and other motion phenomena. The differences in motion types, motion states, and motion parameters of s...

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Application Information

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IPC IPC(8): F42B35/02G01S13/50
CPCF42B35/02G01S13/50
Inventor 潘小义王伟冯德军徐乐涛傅其祥顾赵宇刘永才刘进肖顺平张文明
Owner NAT UNIV OF DEFENSE TECH