基于阵列扩展的宽带DOA估计算法  

Wideband DOA estimation algorithm based on array extension

作　　者：张兴良[1] 王可人[1] 钱峰[1] 

机构地区：[1]电子工程学院,合肥230037

出　　处：《计算机应用研究》2015年第2期556-559,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(61171170)

摘　　要：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。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 extended 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.

关 键 词：阵列信号 宽带信号 空间谱 阵列扩展 

分 类 号：TN911.23[电子电信—通信与信息系统]