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当信号的功率相差较大时,常规的空间谱估计算法往往无法估计出微弱信号的来波方向(DOA)。针对此问题,该文基于矩形阵列,研究了两种强干扰下弱信号的二维DOA估计算法。首先将干扰阻塞(JJM)算法推广至二维DOA估计;然后给出了一种基于正交投影预变换的弱信号测向算法,并且分析了这两种测向算法的统一理论框架;最后通过计算机仿真给出了两种测向算法的性能。
When the power of the signals varies greatly, the conventional DOA estimation algorithm often can not estimate the DOA of weak signals. To solve this problem, based on a rectangular array, two kinds of DOA estimation algorithms for weak signals under strong interference are studied. Firstly, the JJM algorithm is generalized to two-dimensional DOA estimation. Then a weak signal direction finding algorithm based on orthogonal projection pre-transform is given, and a unified theoretical framework of the two direction finding algorithms is analyzed. Finally, Computer simulation gives the performance of two direction finding algorithms.