关键词: DOA估计, 方向估计模糊, 阵列信号处理

Abstract: A new method of DOA estimation based on a special array geometry arrangement is presented. By adding a sensor at a specific location on uniform linear array, a group of special sensor pairs can be obtained, which can break the ULA steering vector's periodicity. The special array not only overcomes the weakness of the ambiguity of DOA estimation, but also achieves the higher resolution than ULA at the same hardware cost. A matrixblock spatial smoothed algorithm applied to the special array is proposed. The data covariance matrix is divided into some blocks according to its steering vector's periodicity, then the traditional spatial smoothed algorithm is applied to each block. After reorganizing the data covariance matrix is amended, the DOA estimation of coherent source can be achieved.

Key words: angle estimation ambiguity, array signal processing , DOA estimation