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基于瞬态极化统计量的微弱信号检测

刘涛;王雪松;李永祯;徐振海;肖顺平   

  1. 国防科技大学 电子科学与工程学院,湖南 长沙 410073
  • 收稿日期:2006-01-19 修回日期:2006-09-11 出版日期:2007-03-20 发布日期:2007-03-20

Detection of Weak Signal Based on Instantaneous Polarization

LIU Tao;WANG Xue song;LI Yong zhen;XU Zhen hai;XIAO Shun ping   

  1. School of Electronic Science and Engineering, National University of Defence Technology, Changsha 410073, China
  • Received:2006-01-19 Revised:2006-09-11 Online:2007-03-20 Published:2007-03-20

被引次数

3

摘要： 针对窄带极化雷达系统，研究了微弱信号的检测问题.首先给出了目标散射信号和随机极化波的瞬态Stokes子矢量的表征方法及其统计特征，然后利用信号和噪声的不同特征，基于极化积累的方法给出了极化聚类中心的统计分布函数，进而构造了GLRT检测似然比，据此提出了一种新颖的微弱信号检测算法，同时计算出CFRA表达式和恒虚警下的检测概率的解析表达式，最后通过仿真验证了该检测算法的性能.结果说明：低信噪比下的新算法可以有效地改善雷达系统的检测性能，对于反隐身、预警和空间探测等领域有着指导意义.

关键词: 微弱信号, 检测, 瞬态极化

Abstract: We study the detection of weak signal using narrowband dual polarization radar. Description of Instantaneous Stokes sub Vector Sequences (ISVS) of radar target signal and noise are presented. The statistics of ISVS and probability density functions of different signals are given, and a novel detection algorithm proposed through polarization and power accumulation in time. We also derive an analytical expression of false alarm probability and show that the constant false alarm rate (CFAR) of the new receiver can be made bounded. Simulation results show that the radar detection performance is improved. It is useful in applications such as anti radar stealthy, early warning and space detection.

Key words: weak signal, detection, instantaneous polarization