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Double-threshold constant false alarm detection method under clutter subspace based on multistatic radar

A technology of clutter subspace and constant false alarm detection, applied in the field of radar, can solve problems such as clutter processing, untargetable double-threshold constant false alarm detection, interference, etc., to improve detection performance, reduce transmission information bandwidth, and reduce complexity degree of effect

Active Publication Date: 2018-05-15
XIDIAN UNIV
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Problems solved by technology

However, in actual radar work, local radar stations often receive interference from the clutter subspace, and fail to process the clutter, and cannot perform double-threshold constant false alarm detection on the target

Method used

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  • Double-threshold constant false alarm detection method under clutter subspace based on multistatic radar
  • Double-threshold constant false alarm detection method under clutter subspace based on multistatic radar
  • Double-threshold constant false alarm detection method under clutter subspace based on multistatic radar

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Embodiment Construction

[0032] refer to figure 1 , the implementation steps of the present invention are as follows:

[0033] Step 1. Collect the radar echo signal to obtain the N×L×(K+1)-dimensional original data matrix X:

[0034] X=[X 1 ,X 2 ,...,X n ,...,X N ],

[0035] Among them, X n Denotes the original data in the nth space diversity channel, X n It is a matrix of L×(K+1) dimension, which is expressed as follows:

[0036]

[0037] where x nls Represents the s+1th data of the lth pulse in the nth space diversity channel, n=1,2,...,N, N is the number of space diversity channels, l=1,2,...,L , L is the number of pulses contained in a non-coherent accumulation cycle, when s=0, x nls Represents the detection unit information, when s=1,2,...,K, x nls Represents the reference unit information near the detection unit, and K represents the number of reference units near the detection unit.

[0038] Step 2. Perform a generalized likelihood ratio test on the original data matrix X to obta...

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Abstract

The invention discloses a double-threshold constant false alarm detection method under clutter subspace based on a multistatic radar, mainly to solve the problems of complex calculation, low detectionperformance and the like in the prior art. The method comprises steps: 1, echo data are collected; 2, the collected echo data are subjected to generalized likelihood ratio detection to obtain a localdetection statistic amount; 3, a first threshold is calculated, the local detection statistic amount is judged according to the first threshold, if the local detection statistic amount is larger thanthe first threshold, the local detection statistic amount is transmitted to a fusion center, or otherwise, elimination is carried out; 5, according to the local detection statistic amount transmittedto the fusion center, a global detection statistic amount is calculated; and 6, a second threshold is calculated, the global detection statistic amount is judged according to the second threshold, ifthe global detection statistic amount is larger than the second threshold, existence of the target is judged, or otherwise, the target is judged not to exist. The radar target can be effectively detected, the system is simple, the applicability is wide, and the method can be used to improve the multistatic radar target detection performance.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically relates to a double-threshold constant false alarm detection method in a clutter subspace, which can be used in a multibase radar target detection system. Background technique [0002] In the radar detection process, the target is not only affected by unstructured interference such as mountain clutter and sea clutter, but also by structured interference such as false targets and active interference. Improving object detection performance in the presence of subspace interference is an open problem. An effective means to solve subspace interference is to suppress signal interference, but this method increases the complexity of the detection system. Projecting the radar echo to the clutter subspace can avoid interference suppression, but it requires a large amount of calculation. [0003] At the same time, in a multistatic radar system, in order to obtain the optimal detection perfo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 苏洪涛李志华刘宏伟赵永波
Owner XIDIAN UNIV
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