Range image non-linear subspace recognition method

An identification method and non-linear technology, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as complex radar environment, nonlinear distribution of one-dimensional range images, etc., and achieve information volume Large, improved recognition performance, easy to handle effects

Inactive Publication Date: 2008-08-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] However, in practical applications, the environment in which the radar is located is very complex, the direction of the air targets such as airplanes is random, and the one-dimensional range image is very sensitive to the change of the target attitude angle, which often leads to the distribution of the one-dimensional range image showing Obvious non-linear features
Therefore, there is still room for further improvement in the recognition performance of linear subspace methods

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[0026] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0027] Let n-dimensional column vector x i，j Represents the one-dimensional range image of the jth training attitude angle of the i-th class target, where i=1, 2,..., g, j=1, 2,..., N i , N=N 1 +N 2 +…+N g , g is the number of target categories, N i is the number of training samples for the i-th type of target, and N is the total number of training samples.

[0028] Nonlinear transformation z of a 1D range profile ij =φ(x ij ) (1)

[0029] where φ( ) is a nonlinear mapping function, which maps a one-dimensional range image to a high-dimensional feature space, z ij for x ij For the image corresponding to the high-dimensional feature space, its dimension is set to n′, which can be arbitrarily large or infinite.

[0030] 1D range image x using different training pose angles i，j The corresponding image z in the n′ high-dimensional...

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Abstract

The present invention provides a method for distinguishing nonlinear subspace of one-dimensional distance image which belongs to field of radar target recognition. Target one-dimensional distance image is transferred nonlinearly and mapped to high-dimensional characteristic space, nonlinear regular sub-image characteristics of each kind of target is obtained by characteristic transform matrix of high-dimensional characteristic space to form nonlinear sub-image space of each kinds of target, when the radar one-dimensional distance image of target is input, the sort of one-dimensional distance image is determined according to Euclidean distance between nonlinear regular sub-image and nonlinear sub-image space. Step: radar one-dimensional distance image training vector of target is determined; between-class scatter matrix sB after nonlinear transform and kernel function are determined; nonzero eigenvalue of C and corresponding eigenvector are determined; kind-in scatter matrix Q is determined; nonzero eigenvalue of Q and corresponding eigenvector are determined; all training one-dimensional distance image nonlinear regular sub-image of each kind target are determined; nonlinear sub-image space of each kind of target is determined; input one-dimensional distance image nonlinear regular sub-image of target is dertermined; Euclidean distance between nonlinear regular sub-image and nonlinear sub-image space is determined; sort number of input target one-dimensional distance image is determined.

Description

Technical field [0001] The invention belongs to radar target identification, and relates to a one-dimensional range image identification method of radar targets, in particular to a nonlinear subspace identification method for one-dimensional range image of radar targets. Background technique [0002] The high-range resolution radar adopts broadband technology, which can realize high-resolution observation of the target in the range direction, and reflect the distribution of the target scattering center on the radar line of sight, which is the one-dimensional range image of the target. Compared with the echo of low-resolution radar, the one-dimensional range image provides more information for target identification. Compared with the two-dimensional radar image (SAR or ISAR), the one-dimensional range image is technically easy to implement and practical . Therefore, radar target recognition technology based on one-dimensional range images has become a hot spot in the field o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G01S7/02
Inventor 周代英杨万麟窦衡陈显宁况凌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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