基于一致聚焦的宽带信号DOA估计方法

摘要

双边相关变换(TCT)法在构造聚焦矩阵时需要预先估计信号的波达方向(DOA),预估计的偏差会影响聚焦效果,严重时可能会导致TCT方法的失效.本文基于一致聚焦思想,提出了一种宽带信号DOA估计方法-致聚焦双边变换(CFTCT)法.由于CFTCT方法使用了一致聚焦变换矩阵,因此不需要预先估计信号的DOA,减小了计算量,同时保证了估计性能.计算机仿真结果证明了CFTCT方法的有效性.%The method using two-sided correlation transformation (TCT) needs pre-estimating the direction-of-arrival (DOA) of wideband sources when constructing focusing matrices. Pre-estimation bias can impair the effect, and may lead to the failure of TCT when it is serious. Based on the idea of consistent focusing, a DOA estimation method for wideband sources named consistent focusing TCT (CFTCT) is proposed in this paper. Due to the use of the consistent focusing matrices in CFTCT, pre-estimation is not needed and the computational burden is also reduced. Moreover, the estimation performance of CFTCT is almost same as that of TCT. Simulation results demonstrate the effectiveness of CFTCT.