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Radar target detection-based free slide window type constant false alarm rate (CFAR) control method

A radar target and control method technology, applied in the direction of measuring device, radio wave measurement system, radio wave reflection/re-radiation, etc., to achieve the effect of improving the detection probability

Inactive Publication Date: 2014-09-10
CHERY AUTOMOBILE CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a free sliding window CFAR control method based on radar target detection, which solves the problem of detecting the existence of targets in complex and uncertain background environments and maintaining a constant false alarm probability. The specific technical solution as follows:

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  • Radar target detection-based free slide window type constant false alarm rate (CFAR) control method
  • Radar target detection-based free slide window type constant false alarm rate (CFAR) control method
  • Radar target detection-based free slide window type constant false alarm rate (CFAR) control method

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Embodiment Construction

[0031] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0032] In a preferred embodiment, a free sliding window CFAR control method is used to maintain a constant false alarm probability to detect radar targets. The basic block diagram of CFAR detection is shown in Figure (1). Among them, Xt(t=1,...,m) is the input signal; Xi is the detected unit; Xi-j(j=-n,-n+1,...,n-1,n) is the reference unit ( That is, the free sliding window); B1 and B2 are the protection units on the left and right sides of the detected unit; the length of the free sliding window is L=n; Zk is the kth (k=0,1,...,n-1) sliding window; Z is Estimation of the clutter power level after CFAR processing; T is a normalization factor; S is a threshold provided to the comparison unit for comparison;

[0033] The judgment criteria are:

[0034] H1:Xi>S

[0035] H0:Xi≤S

[0036]...

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Abstract

The invention relates to a radar target detection-based free slide window type constant false alarm rate (CFAR) control method. The method includes the following steps that: a unit Xi in an input signal Xt (t=1...m) sequence is selected as a detected unit, and the detected unit is adopted as a center, the left side and the right side of the detected unit are respectively provided with a protective unit B1 and a protective unit B2, and then, n units at the left side of the B1 are adopted as an initial free reference window body, and the length of the window body is fixed as L=n; the window body slides from left to right one unit by one unit until reaching n units at the right side of the protective unit B2, with the length of the window body being constant, and altogether, the number of times of slide is n, and n slide windows are obtained; comparative statistics is preformed on average values of the slide windows, so as to determine the final amplitude value of the free slide windows; the final amplitude value of the slide windows is multiplied by a nominal factor T, so that a judgment threshold value S can be obtained; and finally, the detected unit Xi is compared with the threshold value S, if Xi>S, it indicates that a target exists, otherwise, it indicates that no target exists. With the radar target detection-based free slide window type CFAR control method of the invention adopted, the constant false alarm rate of target detection can be maintained, and the detection probability of a target shielding effect and a clutter edge effect can be improved.

Description

technical field [0001] The invention relates to active safety technology, in particular to a free sliding window CFAR control method based on radar target detection. Background technique [0002] For radar, there is not only interference caused by thermal noise inside the receiver, but also clutter interference caused by ground objects, clouds, rain, snow, sea waves, etc., as well as passive and active interference released by the enemy. These interferences are usually very Strong, and variable with location and time. It is usually required to be able to detect the existence of targets in these complex and uncertain background environments and maintain a constant false alarm probability. Contents of the invention [0003] The purpose of the present invention is to provide a free sliding window CFAR control method based on radar target detection, which solves the problem of detecting the existence of targets in complex and uncertain background environments and maintaining ...

Claims

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Application Information

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IPC IPC(8): G01S13/04
CPCG01S7/412G01S7/414
Inventor 张世兵李娟娟陈军
Owner CHERY AUTOMOBILE CO LTD
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