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Multi-strategy Weibull CFAR detection method based on change index

A detection method and multi-strategy technology, applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems of detection performance degradation and achieve the effect of small CFAR loss

Pending Publication Date: 2022-04-29
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is: to solve the problem that the detection performance of the detector in the prior art will decline in the Weibull distribution clutter, a multi-strategy Weibull CFAR detection method based on the change index is proposed

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  • Multi-strategy Weibull CFAR detection method based on change index
  • Multi-strategy Weibull CFAR detection method based on change index
  • Multi-strategy Weibull CFAR detection method based on change index

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specific Embodiment approach 1

[0027] Specific implementation mode one: refer to figure 1 Specifically illustrate this embodiment, the multi-strategy Weibull CFAR detection method based on the variation index described in this embodiment, comprises the following steps:

[0028] Step 1: Obtain the radar echo data passing through the envelope detector, and then obtain the Weibull distribution shape parameters in the radar echo data, and the Weibull distribution shape parameters include the Weibull distribution shape parameters of the front reference window and the trailing edge reference window The Weibull distribution shape parameter of ;

[0029] Step 2: Determine whether the Weibull distribution shape parameters of the front reference window in the radar echo data are the same, if they are the same, calculate the second-order statistics VI and the statistical sum, and use the Monte Carlo simulation experiment to obtain the threshold K VI , then compare VI with K VI Compare, when VI is greater than or equ...

specific Embodiment approach 2

[0033] Embodiment 2: This embodiment is a further description of Embodiment 1. The difference between this embodiment and Embodiment 1 is that the specific steps of using the CFAR detector to complete target detection are:

[0034] Calculate the false alarm probability P by using the CFAR detector and the corresponding reference unit fa The lower detection threshold, and then compare the unit to be detected with the detection threshold, when the unit to be detected is greater than or equal to the detection threshold, it is determined that there is a target in the unit to be detected, otherwise, it is determined that there is no target.

specific Embodiment approach 3

[0035] Embodiment 3: This embodiment is a further description of Embodiment 2. The difference between this embodiment and Embodiment 2 is that in Step 3, the results of the consistency of the shape parameters and the uniformity of the radar echo data are compared. The results, the results of whether the front and rear edge reference windows have the same mean value, and the results of whether the shape parameters of the front and rear edge reference windows are consistent select the CFAR detector and the corresponding reference unit as follows:

[0036]

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Abstract

The invention discloses a multi-strategy Weibull CFAR detection method based on a change index, relates to the technical field of radar adaptive detection, and provides an RWVI-CFAR detector aiming at the problem that the detection performance of a detector in Weibull distribution clutter is reduced in the prior art, the detector has very small CFAR loss in a uniform Weibull clutter environment, and the detection performance of the RWVI-CFAR detector is improved. The method has the detection performance close to TOS-CFAR in a multi-target environment, has the false alarm control capability superior to TGO-CFAR in a clutter edge environment, and effectively solves the problem that the detection performance of a detector is reduced in Weibull distribution clutter. The RWVI-CFAR detector effectively solves the problem that the detection performance of VI-CFAR is reduced in an environment that interference targets exist on both sides by designing a self-adaptive target rejection algorithm.

Description

technical field [0001] The invention relates to the technical field of radar self-adaptive detection, in particular to a multi-strategy Weibull CFAR detection method based on variation index. Background technique [0002] As an adaptive detection technology, constant false alarm detector is widely used in radar target detection. In the actual radar detection environment, there are usually a variety of non-uniform clutters, and the statistical properties of these clutters are usually unknown. In an unknown detection environment, constant false alarm detection technology can adaptively provide a detection threshold according to changes in the detection background to ensure a constant false alarm probability. [0003] At present, most CFAR detectors usually assume that the amplitude of background clutter obeys the Rayleigh distribution, such as CA-CFAR, SO-CFAR, GO-CFAR, and OS-CFAR. However, these detectors will have the problem of degraded detection performance in non-unifo...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4004
Inventor 李杨王新旸张宁
Owner HARBIN INST OF TECH
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