杂波背景中雷达目标极化检测的比较研究

Comparative Study of Polarimetric Detection of Radar Targets in Clutter

该文导出了高斯随机极化波的瞬态Stokes矢量的联合概率密度函数,由此导出了基于Stokes矢量的极化检测器及其检测概率、虚警概率的解析表达式,并给出了该检测器在不同杂波极化度条件下的检测性能理论曲线。对基于Stokes矢量和基于Jones矢量的极化检测器进行了比较研究,给出了大脉冲数条件下二者检测性能差异的解析表达式,证明了基于Stokes矢量的极化检测器是正交双极化接收、非相参积累条件下的最优检测器。

In this paper,we derive the joint probability density functions for the instantaneous Stokes vectors of Gaussian randomly-polarized waves,according to which we derive the polarimetric detectors based on Stokes vectors,whose detection performance is then analyzed. We derive the analytical expressions for detection and false alarm probabilities of the detectors,based on which we obtain the detectors’ performance curves for target detection in clutter with different polarization degrees. Detectors based on Stokes vectors and Jones vectors are then comparatively studied. An analytical expression of the performance variance is deduced for the case of large number of pulses,and it is proved that the detector based on Stokes vectors is the optimal polarimetric detector for noncoherent radars with orthogonally-polarized reception channels.