Adaptive subspace detector under unknown interference in partial uniform environment

Active Publication Date: 2019-03-29
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of radar targ

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  • Adaptive subspace detector under unknown interference in partial uniform environment
  • Adaptive subspace detector under unknown interference in partial uniform environment
  • Adaptive subspace detector under unknown interference in partial uniform environment

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[0018] The present invention will be further explained below in conjunction with the drawings and specific embodiments. Let the number of channels of the multi-channel radar be N, the data to be detected can be represented by an N×1 dimensional column vector x. When there is a target, it is assumed that the target can be described by a subspace of dimension p, and the corresponding signal subspace can be represented by an N×p-dimensional column full-rank matrix A. When the target and interference are included in the data to be detected, x can be written as

[0019] x=Aθ+j+n (1)

[0020] Among them, p×1-dimensional column vector θ represents the unknown amplitude of the signal, N×1-dimensional column vector j represents unknown interference, N×1-dimensional column vector n represents the sum of thermal noise and clutter components in the data to be detected, n obeys The mean is zero and the covariance matrix is ​​R t Gaussian distribution. In practical applications R t Unknown, i...

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Abstract

The invention discloses an adaptive subspace detector under an unknown interference in a partially uniform environment. The detector comprises the following technical steps of: firstly, performing singular value decomposition on a signal guiding matrix, and acquiring a basis matrix corresponding to an interference alternative subspace; performing interference whitening and matching and filtering on the data to-be-detected by the basis matrix and a sampling covariance matrix; performing whitening and filtering on the data to-be-detected by using the sampling covariance matrix; calculating the difference between the output of the whitening and matching and filtering of the data to-be-detected and the output of the interference whitening and matching and filtering of the data to-be-detected,and then performing an normalization operation to form a detector; determining a detection threshold according to the detector and a preset false alarm probability by using a Monte Carlo method; comparing the detector output to a detection threshold, and determining that the target is exist, if the former is greater than the latter, and otherwise, determining that the target does not exist. According to the adaptive subspace detector under the unknown interference in the partial uniform environment, compared with traditional detection methods, the detection method is compared with a traditional detection method, the method provided by the invention has a better detection performance in the unknown interference environment, and has CFAR (Constant False-Alarm Rate) characteristics and does not require an independent CFAR processing.

Description

technical field [0001] The invention relates to a subspace self-adaptive detector under completely unknown interference in a partially uniform environment, and is especially suitable for multi-channel active phased array radars. Background technique [0002] There are many radar target detection methods in a uniform environment. However, due to the complex and changeable terrain and the adoption of a special radar array structure, the actual radar clutter usually presents non-uniform characteristics. Partially homogeneous environment is a kind of non-uniform model that is more common in practical applications, which means that the clutter covariance matrix in the data to be tested and the training sample data have the same structure but there is an unknown power mismatch. Compared with the uniform environment, the detector based on the partial uniform environment design has better robustness to the radar environment. [0003] In addition to clutter, interference usually exi...

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Application Information

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IPC IPC(8): G01S13/04G01S7/41
CPCG01S7/414G01S13/04
Inventor 刘维建王永良段克清杜庆磊王国师周必雷
Owner AIR FORCE EARLY WARNING ACADEMY
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