天基雷达广域监视的恒虚警检测技术

CFAR Detection for Wide-area Surveillance Using Space-based Radar

针对天基雷达对海广域监视应用中低信杂比和复杂杂波环境的情况,提出一种基于超分辨方法的舰船目标恒虚警检测技术。该方法中,将杂波建模为球不变随机向量(SIRV),采用基于共轭倒序阵去相关和特征值校正预处理的序贯检验进行源枚举,并采用超分辨方法估计目标控制矩阵,最后采用广义似然比检验方法,实现恒虚警检测的功能。实验结果表明,在低信杂比和相关信号源的条件下,基于去相关和特征值校正预处理的序贯检验的源枚举准确率可以达到90%以上;基于超分辨方法的目标检测技术能够实现可靠检测,检测概率接近100%,满足天基雷达对海广域监视的要求。

Wide-area sea surveillance using space-based radar has the problems of low SCR and compli- cated clutter environment, an approach based on super-resolution for CFAR detection is proposed here. First- ly, clutter is modeled as SIRV. Then, source enumeration is realized through sequential test which is im- proved by decorrelation of reverse conjugate array and correction of eigen-values, so that steering matrixes of targets are estimated using super-resolution method. Finally, CFAR detection is realized by the method of gen- eralized likelihood ratio test. Simulations show that the validity of enhanced sequential test is more than 90% in the case of low SCR and correlative sources, and that detection technique based on super-resolution can re- alize reliable detection performance （ probability of detection is close to 100% ） which satisfies the require- ments of wide-area sea surveillance using space-based radar.