MMVI-CFAR target detection method

A technology of target detection and constant false alarm, applied in radio wave measurement systems, instruments, etc.

CN103760542AActive Publication Date: 2014-04-30JIANGSU ZHONGHAI HUA HE ENVIRONMENTAL PROTECTION CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-04-30

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Abstract

The invention discloses an MMVI-CFAR target detection method. Clutter background modes which a target signal possibly undergoes are set to be a model set for overcoming the defect of detection performance at the position where different clutter backgrounds of existing radar maneuvering weak targets are connected. The method comprises the specific steps that 1, uniform clutter background models, clutter edge background models and non-uniform multi-target background models are respectively built; 2, a model set corresponding to clutter background areas is built; 3, reference windows are divided into a left reference window, a right reference window and a full reference window; 4, weight calculation is conducted according to the models, and corresponding constant false alarm processing is conducted according to the value of the weight. The MMVI-CFAR target detection method is applicable to various clutter backgrounds, and the advantages of CA-CFAR, SO-CFAR and GO-CFAR during detection of uniform clutter backgrounds, clutter edge backgrounds and multi-target backgrounds are respectively utilized; detection probability is greatly improved at the positions where different clutter backgrounds are overlapped.
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Description

technical field

[0001] The invention belongs to the field of radar signal processing, and in particular relates to a multiple model variability index constant false alarm (Multiple Model Variability Index CFAR, MMVI-CFAR) target detection method. Background technique

[0002] At present, the airborne early warning radar signal processing often adopts long-term coherent accumulation method to increase the actual use of weak target echo signal energy and improve radar detection performance. Although the signal-to-noise ratio of the weak target echo signal has been improved after long-term energy accumulation and various clutter suppression, there are still various noises, clutter, and interference signals in the signal. When clutter and target echoes are displayed on the radar display at the same time, it will make it difficult to observe the target. If the target is in the clutter background, if the detection threshold we set is too high, the weak target will be buried in th...

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] Such as figure 1 As shown, a variable index CFAR object detection method based on multi-mode, performs weighted fusion of three CFAR detectors, that is, adopts unit-average GO-CFAR is used, and SO-CFAR is used in the non-uniform multi-target background; the specific steps are as follows:

[0046] Step 1. Establish uniform clutter background, clutter edge background and non-uniform multi-object background models respectively.

[0047] 1-1. Establish Rayleigh uniform distribution (Rayleigh distribution), Rayleigh distribution corresponds to a uniform clutter background, and its probability density function expression f 1 (x) is:

[0048] f 1 ( x ) = x σ 2 exp ( - ...