Inhomogeneous clutter suppression method based on Mahalanobis distance reweighting

A Mahalanobis distance and distance unit technology, which is applied in the field of radar signal processing, can solve the problems of APR detector performance degradation and detection performance degradation, and achieve good clutter suppression performance and ensure the effect of clutter suppression performance
CN106950546AActive Publication Date: 2017-07-14XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2017-07-14

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Abstract

The invention belongs to the technical field of radar signal processing and discloses an inhomogeneous clutter suppression method based on Mahalanobis distance reweighting. The method comprises steps of: determining eliminating coefficients corresponding to respective pieces of sampled data according to the Mahalanobis distances between the sampled data and reference data; eliminating interference samples from sampling samples by using the eliminating coefficient to obtain data samples; then selecting corresponding training samples according to the Mahalanobis distances between the data samples and the reference samples, and then constructing a reweighting coefficient for reweighting by further using the Mahalanobis distances between the training samples and the reference samples to obtain a corresponding covariance matrix; finally, constructing an adaptive weight vector by using the covariance matrix, and performing clutter suppression by using the adaptive weight vector to obtain corresponding output power. The method can obtain good clutter suppression performance in the case of different sampling number, and has universality and robustness to the clutter inhomogeneous suppression in complex clutter background.
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Description

technical field

[0001] The invention belongs to the technical field of radar signal processing, in particular to a non-uniform clutter suppression method based on Mahalanobis distance reweighting, which is used for clutter suppression and slow target detection in a non-uniform clutter environment. Background technique

[0002] Because the airborne early warning aircraft radar is often in the working state of looking down, its working performance will inevitably be strongly affected by ground clutter. At the same time, due to the relative movement between the airborne radar platform and the ground, the clutter received by the airborne radar presents a strong space-time coupling, which brings great difficulties to the detection of weak and slow targets. In the 1970s, Brennan et al. proposed the Space-Time Adaptive Processor (STAP) method, which suppresses clutter to achieve weak and slow targets through two-dimensional processing in the air and time domains. purpose of detect...

Claims

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