Abstract: This paper proposes a two-dimensional DOA estimation algorithm of weak signals in presence of strong interference via block matrix based on rectangular plane array.It constructs a two-dimensional block matrix to preprocess the received data vector，and then estimates the direction of weak signals.This algorithm improves the probability of detecting the weak signals and the precision of estimation.The effectiveness and correctness of this algorithm have been verified by theory analysis and computer simulations.

Key words: block matrix, array signal, interference suppression, direction estimation

摘要： 基于矩形平面阵列，将一维阻塞矩阵推广至二维，提出了一种强干扰背景下弱信号的二维DOA估计算法。首先构造二维阻塞矩阵对阵列接收数据进行预处理，抑制掉已知方位强干扰，再进行弱信号的谱估计。算法提高了弱信号的检测概率和估计精度。理论分析和仿真实验表明了该算法的有效性和正确性。

关键词: 阻塞矩阵, 阵列信号, 干扰抑制, 方向估计