线性检波下的两种CA-CFAR检测器性能分析

Analysis of Performances of Two CA-CFAR Under Linear Detector

针对雷达线性检波输出后CFAR检测器分析中难以得到检测器背景功率水平估计的概率密度闭解结果问题,综合了两种CA-CFAR检测器的检测性能的理论分析方法,即用多个概率密度的混合近似瑞利分布的方法和基于中心极限定理的方法,从理论上严格推导了后一种方法分析CFAR过程及其检测概率闭解表达式.最后根据数值分析和仿真结果对两种方法的近似表示的准确性问题进行了比较分析,给出两种方法相应的结论.

Aimed at the difficulties to get the closed solution of probability density of detector background power intensity estimation in the analysis of CFAR detector after radar linear detector output, two methods of theoretical analyses of CA-CFAR detection performance were synthesized by using the approximate Rayleigh distribution of mixing multi-χ^2 probability density and central limit-based theorem. Then the analysis of CFAR and its detection probability expression in closed form were derived in the latter analytical method exactly. Finally, the accuracy of two approximation schemes was compared according to the numerical analysis and simulation, and the corresponding conclusions were drawn.