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A dual-threshold cfar and spot agglomeration method for continuous wave radar

A dot-trace condensation and double-threshold technology, which is applied in the field of signal processing, can solve problems such as increased computation, and achieve the effects of improving performance, reducing running time, and reducing computational complexity

Active Publication Date: 2021-02-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, performing CFAR and two-dimensional spectral peak search serially will lead to a large increase in the amount of computation

Method used

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  • A dual-threshold cfar and spot agglomeration method for continuous wave radar
  • A dual-threshold cfar and spot agglomeration method for continuous wave radar
  • A dual-threshold cfar and spot agglomeration method for continuous wave radar

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Embodiment Construction

[0031] The structure and flow process of the present invention are respectively as Figure 4 , Figure 5 As shown, the specific implementation steps are as follows:

[0032] Step 1. Assume that ground clutter obeys Weibull distribution. When the radar is initially working, no target has entered the monitoring range, only the echo of clutter. At this time, the radar samples the clutter echo of a certain length, estimates its shape parameter p, and specifies the false alarm probabilities Pfa1 (higher) and Pfa2 (lower) to be guaranteed by the double thresholds respectively. The corresponding threshold factors T1 and T2 are calculated from Pfa1 and Pfa2.

[0033] Step 2: Perform MTI, MTD, and linear detection on the above-mentioned clutter echo to obtain the range-velocity two-dimensional image when only clutter is included, and calculate the average value Z1 of clutter power for each Doppler channel, which can be obtained in each Doppler channel A lower fixed threshold VT1=Z1...

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Abstract

The invention discloses a double-threshold CFAR and point trace condensation method suitable for continuous wave radar, which belongs to signal processing technology, and specifically relates to continuous wave radar target constant false alarm detection and distance-velocity two-dimensional point trace condensation method. Aiming at the characteristics of small grazing angle and high resolution of the continuous wave perimeter surveillance radar, the false alarm probability formula and the corresponding clutter parameter estimation method of Weibull clutter after linear detection and orderly statistical CFAR are given; Aiming at the traditional OS-CFAR requiring sorting operation and taking a long time, a double-threshold CFAR method is proposed, which greatly reduces the number of statistical sorting, and further reduces the running time by adding GO logic and improves the performance in the clutter edge. performance; proposed a joint implementation of CFAR detection and point trace agglomeration, which not only ensures the correct pairing of upper and lower frequency sweeps in the subsequent processing of continuous wave radar, but also greatly reduces the computational complexity compared with traditional serial operations.

Description

technical field [0001] The invention belongs to signal processing technology, in particular to continuous wave radar target constant false alarm detection and distance-velocity two-dimensional point trace coagulation method. Background technique [0002] Detection is a fundamental operation in radar signal processing. Constant false alarm detection is an important part of detection technology. It has been widely used in radar, communication and other fields after in-depth research in recent decades. [0003] The perimeter surveillance radar can adopt the continuous wave system to construct a virtual perimeter to detect illegally intruded ground targets. In view of the problem of target distance and velocity coupling in the LFMCW radar, the present invention adopts symmetrical triangular linear frequency-modulated continuous wave (STLFMCW), which See the beat principle figure 1 shown. [0004] Constant false alarm (CFAR) technology, that is, to maintain a constant false al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S13/536G01S13/56G01S13/58
CPCG01S7/414G01S7/415G01S13/536G01S13/56G01S13/584
Inventor 于雪莲刘任申威李海翔周云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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