Model Validation of the Extremely Heterogeneous SAR Clutter and Its CFAR Detection

LIU Xiang-yang; XU Jia; PENG Ying-ning

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Model Validation of the Extremely Heterogeneous SAR Clutter and Its CFAR Detection

更新时间：2025-07-16

- Model Validation of the Extremely Heterogeneous SAR Clutter and Its CFAR Detection
- Acta Electronica Sinica Vol. 35, Issue 9, Pages: 1617-1621(2007)
- 作者机构：
  
  1. 西安通信学院通信装备管理系,陕西,西安,710106
  2. 清华大学电子工程系,北京,100084
  3. 空军雷达学院四系,湖北,武汉,430019
  4. 西安通信学院通信装备管理系陕西西安,710106
  5. 清华大学电子工程系北京,100084
  6. 空军雷达学院四系湖北武汉,430019
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN957.54TN957.51
- Published：2007
- 稿件说明：
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LIU Xiang-yang, XU Jia, PENG Ying-ning. Model Validation of the Extremely Heterogeneous SAR Clutter and Its CFAR Detection[J]. Acta Electronica Sinica, 2007, 35(9): 1617-1621.
DOI：

LIU Xiang-yang, XU Jia, PENG Ying-ning. Model Validation of the Extremely Heterogeneous SAR Clutter and Its CFAR Detection[J]. Acta Electronica Sinica, 2007, 35(9): 1617-1621. DOI：

摘要

基于合成孔径雷达(SAR)城区极不均匀杂波实际数据和Cramer-Von Mises距离

本文运用Rayleigh分布、Weibull分布、K分布和G分布对杂波进行了分布拟合检验.结果表明Rayleigh分布和Weibull分布难以拟合极不均匀场景回波

K分布只能部分拟合

而G分布的拟合程度最好.进而

针对G分布下的目标恒虚警检测问题

本文给出了不同参考单元条件下达到给定检测性能时信噪比随形状参数的变化曲线

分析了恒虚警(CFAR)性能损失随分布参数变化的原因

得到了确定恒虚警门限的有效方法.

Abstract

Based on real extremely heterogeneous synthetic aperture radar (SAR) urban clutter data and Cramer-Von Mises distance

the goodness-of-fit tests were done via Rayleigh distribution

Weibull distribution

K distribution and G distribution

respectively.It is shown that the Rayleigh distribution and Weibull distribution may be mismatched and the K distribution may be only partly matched

but the G distribution may model the real data very well.Furthermore

for the CFAR(Constant False Alarm Rate) detection under the G distributed clutter

the curves of the signal-to-noise ratio versus shape parameter and numbers of reference cells were presented to meet the given detection performance

and the reason was also analyzed that the CFAR losses decrease with the increasing of the distribution parameter.Also

an effective CFAR threshold calculating method was proposed at last.

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