一类快速的宽带分布源到达角估计算法

针对宽带分布源到达角估计问题,提出了一类快速的估计算法,即中频法、中值法和均值法。该类算法首先将阵列接收的宽带信号变换到频率域,然后对于每个频率形成阵列接收信号协方差阵,最后由该协方差阵的次对角线元素估计宽带分布源的到达角,其主要特点是避免了相位展开。仿真结果表明,在高信噪比和分布角不大时,中频法和中值法的性能几利相同;但在低信噪比时,中值法优于中频法。此外,均值法对分布角不敏感,且性能较优。

Quick DOA estimation algorithms for a broadband distributed source

In order to estimate the direction of arrival (DOA) of a broadband distributed source, a class of fast algorithms, such as central frequency algorithm, median algorithm and mean algorithm, are presented. The algorithms estimate the DOA of the broadband distributed source fron the secondary diagonal elements of the covariance matrices generated from every frequency domain of the received broadband signals, thus avoiding unwrapping of phases. Simulation results demonstrate that when SNR is high and spread angle is not big, the central frequency algorithm and the median algorithm are almost identical; while when SNR is low, the median algorithm outperforms the central frequency. Furthermore, the mean algorithm is not sensitive to the spread angle and has a better performance.;