非高斯杂波下距离扩展目标检测器的失配性能分析

Performance Assessment of Range-Spread Target Detector for Unwanted Signal in Non-Gaussian Clutter

在球不变随机向量杂波条件下,研究了目标方向向量失配时距离扩展目标的检测问题.针对不依赖于散射点密度的广义似然比检验检测器,从理论上分析了信号实际方向向量与导向矢量失配对检测性能的影响,推导了失配条件下的检测和虚警概率公式,证明了检测器的恒虚警率特性.仿真实验表明,检测器对能量均匀分布的目标具有最佳性能,对失配目标信号具有很强的抑制能力;进一步分析表明,目标幅度起伏会带来一定的检测损失,而距离单元间散射点的相关性在高值检测概率区也会引起检测损失.

This paper assesses the performance of range-spread target detector in spherically invariant random vector clutter,when the actual signal is misaligned with the assumed direction of arrival.As for the non-scatterer density dependent generalized likelihood ratio test（NSDD-GLRT）,the influence of signal direction vector mismatched with steering vector on detection probability is analyzed theoretically.Moreover,the formulas for detection probability and false alarm probability are deduced,and the constant false alarm rate property of detector is proved.The experimental results show that NSDD-GLRT performs best when the target energy is uniformly distributed,and rejects the signal mismatched with steering vector effectively.In addition,the correlation between target amplitudes results in an additional loss for values of detection probability in the high range,and the fluctuation of target amplitudes also brings forth performance loss.