基于空时频分析的多FH/DS信号DOA估计  

Directions of Arrival Estimation for Multicomponent Frequency-Hopping/Direct Sequence Spread Spectrum Signals Based on Spatial Time-Frequency Analysis

作　　者：陈利虎[1] 王永明[1] 张尔扬[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2009年第8期1309-1313,共5页Journal of Signal Processing

摘　　要：提出了一种基于空时频分析的跳频/直扩(Frequency Hopping & Direct Sequence,FH/DS)信号的波达方向(DOA,Direction of Arrival)估计方法,该方法能够在欠定条件下(传感器数目小于信号数目)实现多个FH/DS信号的精确测向。首先对每个阵元的数据进行时频变换,得到全景时频图;再在时频域提取有效hop,并根据各阵元的时频值建立每点的空时频矩阵;最后分别运用基于线性空时频方法和二次空时频方法估计每hop信号的DOA。仿真结果验证了方法的有效性。An algorithm of DOA estimation for multicomponet FH/DS signals based on spatial time-frequency analysis is proposed, which can realize exact DOA estimation in underdetermined condition. First, a clear time-frequency representation is gained by time-frequency distribution（STFD）. Second, effective hops are selected from the time-frequency distributions, and every time-frequency-dot＇ s spatial time-frequency matrix is built. At last every hop＇ s DOA is estimated based on linear STFD method or bilinear STFD. The simulation results demonstrate that the estimation algorithm is effective and efficient.

关 键 词：跳频/直扩 空时频分析 DOA估计 

分 类 号：TN911.1[电子电信—通信与信息系统]