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Improved particle filter track-before-detection method for weak target detection

A particle filter and weak target technology, applied in the field of radar target detection and weak target radar detection under low signal-to-noise ratio

Inactive Publication Date: 2011-05-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the problems existing in the existing particle filter tracking before detection method, the present invention provides an improved particle filter tracking before detection method for weak target detection

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  • Improved particle filter track-before-detection method for weak target detection

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Embodiment Construction

[0087] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0088] Step 1. Initialize system parameters:

[0089] Initialization system parameters include: radar antenna scan cycle T r = 1 second, the prior distribution of the target state p(x 0 ): x obeys U(0, M), y obeys U(0, N), subject to U(-1, 1), Obey U(-1, 1), where x and y represent the coordinates of the target in the X and Y directions, respectively, and Represents the speed of the target in the X and Y directions, U(a, b) represents the uniform distribution on the interval from a to b; M=20 and N=20 are the total number of units quantized on the X-axis and Y-axis in the echo data, respectively. The prior probability Pr(E 0 =1)=0.1, the total number of particles N s =2000, the birth probability of the target P b = 0.05 and the probability of death P d = 0.0...

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Abstract

The invention discloses an improved particle filter track-before-detection method for weak target detection. In the method, The method is characterized in that: particles are divided into three types of sets of death, new birth and continuing survival according to the state of a target existence variable, and the state of particles in different sets are separately operated; the particles in the death set are not defined or operated; the particles in the new birth set acquire a new state according to prior distribution sampling; and the particles in the continuing survival set are regenerated according to gaussian distribution and acquire a new state according to a target motion model. By the method, the amount of operation is reduced, the diversity of the particles is improved, and the phenomenon of sampling exhaustion is effectively avoided. The method has the characteristics of short calculation time, high robustness, stable and reliable detection performance and high tracking precision.

Description

Technical field: [0001] The invention belongs to the technical field of radar target detection, and in particular relates to the technical field of radar detection of weak targets under low signal-to-noise ratio. Background technique: [0002] With the development and progress of modern technology, radar target detection technology is facing huge challenges. For example, stealth targets have greatly reduced the detection distance of such targets due to the greatly reduced radar reflection cross-section. Therefore, improving the radar's ability to detect and track weak targets has become an extremely important and severe mission. [0003] The tracking before detection technology utilizes the motion characteristics of the target, and through the joint processing of echo data without a threshold (or low threshold) of multiple frames, the non-coherent accumulation of echo energy of multiple frames is obtained, the signal-to-noise ratio is improved, and the detection of weak Tar...

Claims

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Application Information

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IPC IPC(8): G01S13/66G01S7/36
Inventor 张晓玲樊玲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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