非高斯背景下基于动态阈值的距离扩展目标检测器

Range-Spread Target Detector with Dynamic Threshold for Non-Gaussian Clutter

本文研究了球不变随机向量杂波背景下的距离扩展目标检测问题.给出了修正的距离扩展目标检测器MSDD,推导了相应的虚警概率与检测阈值的解析表达式.性能分析表明,目标能量均匀分布时,MSDD能获得最佳的检测性能,并且其对目标所占距离窗的不同大小具有很好的鲁棒性;但当估计目标散射点个数小于实际值时,MSDD存在一定的检测损失.针对这一问题,提出了基于动态阈值的检测器DT.DT能根据实际观测值动态调整检测阈值,有效提高检测性能,增强系统在失配情况下的鲁棒性.

This paper addresses range-spread target detection in spherically invariant random vector clutter.The modified detector based on scatterer density dependent（MSDD） is introduced,and the formula relating false alarm probability to detection threshold is deduced.It shows that MSDD performs best when the target energy is uniformly distributed in range cells;moreover,it is also robust for various target range extent.However,when the estimated number of scatterers is smaller than the actual one,MSDD is degraded sharply.To improve the robustness of MSDD,a detector with dynamic threshold（DT） is proposed.For DT,the dynamic estimated number of target scatterers is adjusted according to the observations,which can improve performance and robustness of detector effectively.