海杂波背景下的组合自适应GLRT-LTD  

Combined Adaptive GLRT-LTD against Sea Clutter

作　　者：刘明[1] 水鹏朗[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2015年第12期2984-2990,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61271295)~~

摘　　要：为了检测海杂波背景下的微弱运动目标,相干检测器通常需要作长时间的累积。然而,长时累积条件下的目标多普勒频率的扩散和幅度的起伏以及海杂波空间非均匀性对参考单元数目的限制导致传统的自适应检测器没法工作。注意到逆伽马(IG)纹理的复合高斯分布(CGD)可以很好地描述海杂波和目标的瞬时频率是时间的慢变函数,该文提出一种组合自适应检测器,即组合自适应广义似然比线性门限检测器(CA-GLRT-LTD),它由自适应GLRT-LTD在几个连续的短的累积间隔上的最大响应的乘积的构成。由于GLRT-LTD对IG纹理的复合高斯杂波的最优性,该检测器相比组合自适应归一化匹配滤波(CANMF)检测器具有更好的检测性能。Long integration is often required to detect weak moving target in sea clutter. However, the Doppler frequency spread and amplitude fluctuation in long integration and limited reference cells resulting from spatial non-homogeneity of sea clutter make the traditional adaptive detector work badly. By observing that the Compound Gaussian Distribution（CGD） with Inverse Gamma（IG） texture gives a good fit to sea clutter and the instantaneous frequency is slowly varying, a combined adaptive detector, namely the Combined Adaptive Generalized Likelihood Ratio Test-Linear Threshold Detector（CA-GLRT-LTD）, is proposed in the paper, which consists of the product of the maximal response of the adaptive GLRT-LTD in several continuous short integration intervals. Owing to the optimality of the GLRT-LTD for CG clutter with IG texture, the proposed detector obtains better performance than the Combined Adaptive Normalized Matched Filter（CANMF） detector.

关 键 词：目标检测 长时累积 逆伽马纹理 海杂波 组合自适应广义似然比线性门限检测器 

分 类 号：TN959.72[电子电信—信号与信息处理]