基于阵列扩展的宽带D OA估计算法

摘要

Because the steering vectors are different in different frequency,it is difficult to estimate the direction-of-arrival (DOA)of wideband signal.To settle this problem,firstly,this paper proposed a direct spatial spectrum estimation algorithm of wideband signal,the restrictive condition of which was extremely strict.Then,using the delay property of wideband signal,it ex-tended the array to propose a new wideband DOA estimation algorithm.The new algorithm did not need to pre-estimate DOAs. Finally,it analyzed how to use the new algorithm under the two frequency spectrum conditions of continuous spectrum and comb spectrum.The results of simulation experiments show that the new algorithm has higher probability of success and smaller esti-mation error than the traditional algorithms when the signal-to-noise ratio (SNR)is high.%导向矢量的频率不一致性不利于宽带信号的DOA估计。为此，首先提出宽带直接空间谱估计算法，但是其限制条件过于苛刻；然后利用宽带信号的时延性质对阵列进行扩展，提出一种新的宽带DOA估计算法，新算法不需要DOA预估计；最后分析了梳妆谱和连续谱两种情形下如何使用新算法的问题。仿真实验结果表明，在信噪比较高的条件下，与传统算法相比，新算法的估计成功率更高，估计误差更小。