An Improved Music Algorithm for DOA Estimation of Coherent Signals

Abstract

The estimation of direction of arrival (DOA) is the main study of the direction finding and location of radio signal, MUSIC algorithm is the most classic DOA estimation. MUSIC algorithm can estimate independent signals’ DOA effectively, but it is failure to coherent signals. Concerning the issue, the modified MUSIC algorithm works when the correlative signals exist. However, the estimation performance of modified MUSIC algorithm will deteriorate in the case that the signal-noise rate is low. This paper improves the modified MUSIC algorithm by using matrix decomposition. Finally, the computer simulation results prove that this proposed method has better direction finding performance than the modified MUSIC algorithm with low signal to noise ratio.

Keywords

• Direction finding and location
• MUSIC algorithm
• Modified MUSIC algorithm
• Improved modified MUSIC algorithm.