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Double-threshold CFAR and trace point condensation method suitable 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, ensuring correct matching, and reducing computation complexity

Active Publication Date: 2018-03-30
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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  • Double-threshold CFAR and trace point condensation method suitable for continuous wave radar
  • Double-threshold CFAR and trace point condensation method suitable for continuous wave radar
  • Double-threshold CFAR and trace point condensation method suitable 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 CRAR and trace point condensation method suitable for a continuous wave radar, belongs to a signal processing technology, and specifically relates to a continuous wave radar target constant false alarm detection and distance-speed two-dimensional trace point condensation method. Aiming at the characteristics of a relatively small wave beam grazing angle and relatively high resolution ratio of a continuous wave perimeter monitoring radar, a false alarm probability formula for ordered statistics of CRAR after Weibull clutter is subjected to linear detection and a corresponding clutter parameter estimation method are given; aiming at the problem that traditional OS-CRAR needs ranking operation and is relatively large in time consumption, a method fordouble-threshold CFAR is proposed, the number of times of statistical ranking is greatly reduced, and through addition of GO logic, running time is further reduced, and performance in clutter edges is improved; and joint realization of CRAR detection and trace point condensation is proposed, correct pairing of upper and lower frequency sweeping in subsequent processing of the continuous wave radar is guaranteed, and compared with traditional serial operation, computational complexity is greatly reduced.

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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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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