摘要
传统干涉仪测向是对单个脉冲信号测向的,对于多信号没有分辨能力,对于线性调频等时变频率信号也不能直接应用。本文提出了一种时频干涉仪算法以实现对宽带线性调频信号的到达角(DOA)估计;同时该算法可实现多信号分辨;讨论了通道误差对算法性能的影响;分析表明,通道增益不一致不会造成DOA估计错误,而通道时延的不一致将造成DOA估计错误;给出了通道时延误差校正算法,通过校正可实现DOA的正确估计;计算机仿真结果证实了分析的正确性。
Interferometer direction finding technique is adapted to estimating Direction-of-Arrival （DOA） of a single pulse. It can not resolve multiple signals. At the same time, it cannot be applied to time-varying frequency signals such as chirp signals directly. An algorithm of DOA estimation with time-frequency interferometer is presented. The algorithm can resolve multiple signals and be applied to chirp wideband chirp signals. The effect of the channel uncertainty on the performance is discussed. The analysis indicates that the channel gain uncertainty does not cause the estimation error, but the channel delay uncertainty brings the estimation error. A method of calibrating the channel delay uncertainty is presented. The computer simulations demonstrate the correctness of the analysis.
出处
《电路与系统学报》
CSCD
北大核心
2007年第1期114-118,共5页
Journal of Circuits and Systems
基金
国防预研项目资助(41101030103)
