基于均匀圆阵的LFM信号DOA估计  

DOA Estimation of LFM Signals Based on UCA

作　　者：田贤峰 陈晓明 

机构地区：[1]空军军训器材研究所,北京100195

出　　处：《计算机仿真》2010年第9期1-3,8,共4页Computer Simulation

基　　金：国家自然科学基金重点资助项目:L波段SAR电子干扰实现(2005AA1252/1253)

摘　　要：针对为解决对雷达和通信中的线性调频信号源(LFM)定位的难题,为提高定位精度,提出了一种基于均匀圆阵的测向定位方法。方法通过分数傅立叶变换(FRFT)对LFM信号的能量聚焦特性,构造出一种新的FRFT域阵列数据模型;采用UCA-RB-MUSIC算法测向,通过模式激励法把阵元空间转换到实波束空间,对谱函数进行二维搜索,得到辐射源的方位角和俯仰角。通过理论推导和仿真验证,证明方法具有测向精度高、运算量小、360°全方位测向的优点。A new DOA estimation algorithm based on uniform circular arrays is presented,in order to locate to LFM signals that radar and telecommunication satellite transmits. A new array model in FRFT domain is constructed based on the fact that LFM signal has the energy concentrated performance in the FRFT domain. Array space is transformed to beam-space through mode excitation method. Azimuth angle and pitching angle are calculated through UCA-RB-MUSIC estimation algorithm. Doppler frequency and chirp rate are not needed to be measured,and high precision of all directions estimation can be gained in this way.

关 键 词：均匀圆阵 方位估计 分数傅立叶变换 多通道圆阵算法 线性调频信号 模式激励法 

分 类 号：TN911[电子电信—通信与信息系统]