Abstract:

The nature of signals with a non-circularity rate can improve the performance of direction of arrival (DOA) estimation.  However, most existing algorithms are not suitable for the general case in which both circular and noncircular incident  signals exist. By analyzing the necessary conditions of steering vectors of mixed incident signals, the conclusion is  drawn that pseudo peaks exist in the case of more sources, low signal to noise rate or small number of snapshots. Then,  an improved algorithm is proposed. Simulation results show that all the DOAs of signals can be estimated by the proposed  algorithm, and pseudo peaks are restrained. Besides, the accuracy is raised compared with the original algorithm.