K分布雷达杂波中两种非参量检测器性能分析

Performance Analysis of Two Nonparametric Detectors in K-Distributed Clutter

分析了广义符号检测器(GSD)和秩二元累积检测器(RQD)两种非参量检测器在独立和相关K分布杂波下的检测性能。Monte Carlo数值试验表明,GSD在独立K分布杂波拖尾特性越明显时,达到指定检测概率所需要的信杂比越小,而RQD则与之相反。针对独立K分布杂波,RQD的第一检测门限等于参考单元数时可获得较好的检测性能。当参考单元数大于24时,继续增加参考单元数目对于提高两类检测器的检测性能的效果不明显。同时,两类检测器在相关K分布杂波下的虚警概率均会急剧增加,难以完成相关K分布下的CFAR检测。

This paper analyzes the detection performance of generalized sign detector（GSD） and rank quantized detector（RQD） under the independent and correlated K-distributed clutters,respectively.Monte Carlo simulations show that,with the same detection probability and false alarm probability,the longer the independent K-distributed clutter＇s tail,the smaller signal to clutter ratio（SCR） is needed for GSD,while the RQD has a inverse effect different from GSD.RQD may obtain good detection performance under independent K-distributed clutter by setting the first threshold equal to the number of reference units.Also,the detection performance of both GSD and RQD can not obtain significant improvement when the number of the reference samples is larger than 24.In the correlated K-distributed clutter,the false alarm probabilities of both detectors may sharply increase and can not keep the constant false alarm ratio.