Abstract: Based on the problem that some unexpected peaks appear in the 2-D MUSIC spectrum when the source number is over estimated and some peaks of the 2-D MUSIC spectrum disappear when the source number is under-estimated. By combining the reducing-dimension technique with the ONE-DIMENSION NOISE SUB-SPACE algorithm, an modified 2-D MUSIC algorithm based on three orthogonal linear arrays is discussed in this paper. It could convert the complicated 2-D processing into three simple 1-D processings. This algorithm utilizes the 1-D DOA which is estimated by the three collateral linear arrays respectively. Computer simulation results indicate that the modified algorithm can give the DOA successfully under the situation of un-known source numbers.

Key words: array signal processing, signal DOA estimation, 2-D MUSIC algorithm, orthogonal array