Non-library target range image discrimination method

A discrimination method and a distance image technology, which can be used in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc.

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

[0005] However, when the target to be recognized does not participate in the training process, since the input of the one-dimensional range image recognizer is the one-dimensional range image of a non-library target, all classification and recognition methods cannot distinguish this situation

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Embodiment Construction

[0046] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0047] Let g be the number of target categories, N i is the number of one-dimensional range image training samples of the i-th class target, N=N 1 +N 2 …+N g , N is the total number of training samples for all targets, n-dimensional column vector x ij Represent the one-dimensional range image training vector of the jth attitude angle of the i-th class target, where i=1, 2,..., g, j=1, 2,...N i .

[0048] to x ijPerform preprocessing and subtract its mean value, then E{x ij}=0.

[0049] to x ij Perform the following non-linear transformation

[0050] z ij =φ(x ij ) (1)

[0051] Among them, φ( ) is a nonlinear mapping, which can map vectors to high-dimensional linear feature spaces, z ij for x ij The image corresponding to the high-dimensional feature space, whose dimension is arbitrarily large or infinite, i...

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Abstract

The present invention provides a method for distinguishing one-dimensional distance image of non-library target which belongs to field of radar target recognition. Pretreatment with training vector of radar target one-dimensional distance image, subtracting equal value; determining kernel function, kernel matrix and nonlinear characteristics subspace combined by front q eigenvectors corresponding to most nonzero eigenvalue and nonlinear mapping of training one-dimensional image; determining projection of radar target one-dimensional distance image vector in nonlinear characteristics subspace and total library target template; determining judgement threshold of non-library target according to estimation of conditional mean and conditional root mean square difference of smallest distance of training target supposement; according to least Euclidean distance between target library template vector and projection of radar target one-dimensional distance image in nonlinear characteristics subspace to determine whether the input radar target one-dimensional distance image is belong to non-library target, if not belong to, the sort of input radar target one-dimensional distance image is determined. The present invention makes the one-dimensional distance image recognizer distinguish input is a non-library target and build training library actively.

Description

Technical field [0001] The invention belongs to radar target recognition, relates to a one-dimensional range image recognition technology, in particular to a non-library target discrimination method in the one-dimensional range image recognition. Background technique [0002] Radar target recognition is based on the relevant information provided by the radar target echo to make a judgment on the category and attribute of the target. The amount of echo information depends on the observation method. The one-dimensional range image of the target can be obtained by using the high-range resolution radar as the observation method. The one-dimensional range image reflects the geometric shape and structural characteristics of the target. Compared with the low-resolution radar, it can provide more characteristic information required for identification. . [0003] However, the one-dimensional range image is very sensitive to the change of the target attitude angle. Under different t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/02G01S13/02
Inventor 沈晓峰杨万麟周代英张乃杨瑞明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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