雷达低空测向环境中的直达波DOA估计算法  

Direct signal DOA estimation algorithm in radar low angle bearing environment

作　　者：张陆游[1] 张永顺[1] 杨云[1] 张琳[1] 

机构地区：[1]空军工程大学导弹学院,陕西三原713800

出　　处：《航天电子对抗》2009年第3期29-31,54,共4页Aerospace Electronic Warfare

基　　金：国家自然科学基金项目(60601016);陕西省自然基金项目(SJ08F21)

摘　　要：基于低空测角模型,提出了一种基于四阶累积量的直达波方位估计算法。该算法首先采用Pro-VESPA算法估计出广义方向矩阵,再利用目标直达波信号和多径信号之间的仰角几何关系,不需已知多径信号的相干系数,对广义方向矩阵函数一维搜索就可直接精确获得直达波方位,算法适用于高斯白噪声或色噪声环境,具有较好的鲁棒性。计算机仿真验证了该算法的有效性。According to the model of low angle bearing, a new direct signal DOA estimation algorithm is proposed based on fourth-order cumulant. Firstly the generalized response vector estimation is got by the Pro- VESPA method. Secondly by using the elevation geometry relation of direct wave and multi-path signals, the accurate direct signal DOA estimation is acquired through one dimension function searching. Using the algo- rithm doesn＇t need to know the multi-path signal correlation coefficient. It can be applied in white gauss or color noise environment and is more robust. Computer simulation results prove the validity of this algorithm.

关 键 词：低空测角 波达方向 四阶累积量 直达波 

分 类 号：TN953[电子电信—信号与信息处理]