Abstract:

The problem of direction of arrival (DOA) estimation based on uniform linear array (ULA) is studied. A signal processing method by making full use of the receiving data in the antenna array is proposed to estimate angles of spatial signals. The key point is to construct a new model of received signals by adopting the real part of the antenna array cell, next to implement blind source separation for received signals by independent component analysis (ICA), and solve incident angles by the least square (LS) method. The requirement for antenna array cell internal is given in the process of the algorithm. Simulation experiments show that compared with the multiple signal classification (MUSIC) method, the new method is more suitable for adjusting the antenna array cell internal, has better estimation performance in low signal-to-noise ratio (SNR) and degree distinguishing capacity, and achieves high precision by onestep crude estimation and good real time performance. Also, its merit is illustrated by the root mean square error (RMSE) curve and Cramer-Rao bound (CRB) characteristics. Furthermore, estimation precision can be improved by refined estimation course.