基于时频子空间的多分量宽带调频信号DOA估计  

Direction of Arrival Estimation for Multi-LFM Wideband Signal

作　　者：王雪飞[1] 尚朝轩[1] 王昌盛[1] 

机构地区：[1]军械工程学院光学与电子工程系,石家庄050003

出　　处：《电讯技术》2012年第10期1586-1590,共5页Telecommunication Engineering

摘　　要：为在复杂电磁环境下实现对多分量宽带线性调频信号的到达角(DOA)估计,研究了基于时频子空间的到达角估计算法,对阵列接收信号通过二维时频掩膜滤波逐一提取各信源的时频自项,建立了空时频矩阵,运用子空间技术得到各信源的到达角估计,并与宽带聚汇算法比较,进行了仿真实验。仿真结果表明,由于充分利用了多分量线性调频信号的时频信息,在低信噪比条件下,宽带时频子空间方法比宽带聚汇算法具有更高的DOA估计的分辨率和估计精度。In studies on direction of arrival（DOA） estimation of multi-LFM（Linear Frequency Modulation）wideband sources in intensive electromagnetic environment,the method of narrowband source DOA estimation based on time-frequency subspace analysis is applied in wideband array model,which extracts the time-frequency characteristic of array received signals through the two-dimensional time-frequency mask filter,and then establishes spatial time-frequency distribution（STFD） matrix to use the subspace technology to get DOA estimation of sources.The proposed algorithm is compared with the wideband focusing algorithm.Computer simulation results prove that wideband time-frequency subspace method performs a better performance than wideband focusing algorithm.

关 键 词：雷达电子对抗 阵列信号处理 时频分布 空时频矩阵 宽带聚汇算法 

分 类 号：TN971[电子电信—信号与信息处理]