基于重要性采样的宽带雷达检测门限设置方法

宽带雷达被广泛应用于目标成像、识别与精密测量,其检测门限的确定是宽带检测领域的重要问题.本文针对某些无法或难以确定解析门限的宽带雷达检测器,提出了基于重要性采样的宽带雷达检测门限设置方法.首先引入重要性采样以提高小概率样本的采样效率,然后通过积累样本权重绘制宽带检测器虚警与门限的关系曲线,最后对该曲线线性插值得到关注虚...

Threshold Setting Method for Wideband Radar Detectors Based on Importance Sampling

Wideband radar utilized wideband signals to enhance the range resolutions of tracking and generated high-resolution images containing the feature information of targets, from which the targets could be precisely measured, classified and identified. The determination of the detection threshold of wideband radar detector was an important issue in the field of wideband detection. This paper introduced a threshold setting method based on importance sampling, especially for wideband radar detectors that couldn’t or were difficult to determine analytical threshold. First, importance sampling, which could be used to significantly reduce the estimation variance, was introduced to improve the sampling efficiency of rare samples. Then the relationship curve between wideband detector’s false alarm probabilities and thresholds were drawn through accumulating sample weights that passed the thresholds. Finally, the interested thresholds were obtained by linear interpolating the above curve. Simulation experiments showed that the proposed method could effectively enhance the computing scale, and improve the detector threshold computing accuracy and speed.