一种快速的宽带相干源DOA估计算法

在现有的投影子空间正交性测试(TOPS)基础上,提出了一种解决宽带相干信源的快速空间谱估计的新方法。该方法通过将窄带快速子空间算法和能量门限算法相结合运用到频域子空间正交性测试算法中,对每个过门限的窄带信号运用窄带快速子空间算法,将共轭重构运用到TOFS算法对宽带相干信号进行目标达到方向(DOA)估计。该算法不需要角度和参考频率的预估计,且去相关处理简单易实现,运算量降低,是一种快速的宽带相干源DOA估计算法。通过计算机仿真结果,验证了该算法在信噪比6 dB以上有较小的均方根误差及较高的分辨概率。

A Fast DOA Estimation Algorithm for Wideband Coherent Signals

This paper proposes a novel algorithm for fast space spectrum direction-of-arrival (DOA) based on the test of orthogonality of frequency (TOFS). The method combines fast subspace algorithm and energy threshold algorithm in executing TOFS. Fast subspace algorithm is used for every threshold-passing narrowband signal, and then matrix conjugated reconstruction method is combined with TOFS algorithm, which solves the shortcoming of TOFS algorithm that can not process coherent sources. With the proposed algorithm, initial estimations of DOA and reference frequencies are unnecessary, decorrelation can be realized, and the calculation comlexcity is decreases. Computer simulations demonstrate that the presented algorithm is a more efficient algorithm for estimating the DOA of wideband coherent sources, which its complexity is lower than root mean square error,but its discrimination probability is higher than that when signal-to-noise ratio is above 6 dB.