Direction of Arrival Estimation for Coherent Distributed Target Sources

The strong coherence between target sources leads to rank loss of covariance matrix of receiving data may, and hence cause incomplete target report. In order to estimate the direction of arrival (DOA) of coherent target sources and increase the estimation performance of the algorithm under low signal to noise ratio (SNR), an improved DOA estimation method of Toeplitz, namely, sub-spatial rebuild method is presented. The sampling matrix is treated by Toeplitz based on the method of dealing with dot target coherent distributed source, then the sub-spatial obtained after decomposing the characteristic of covariance matrix of receiving data is rebuilt, and the DOA estimation of coherent distributed source is dealt with effectively. Simulation results show that the method can improve the estimation performance of the algorithm under low SNR and estimate effectively coherent distributed source.