To detect and estimate weak targets from the strong ones,a new method based on adaptive iteration is proposed to estimate the DOA.Firstly,the space angle is dispersed and the spatial spectrum function is constructed based on the property of signal subtraction.Secondly,the energy of strong signal is suppressed through adaptive iteration.Finally,the value of spatial spectrum is calculated,and the DOAs of the signals are estimated through the peaks.Theoretical analysis and simulation results show that the method can achieve high-resolution DOA estimation without the prior knowledge of angles,even with the low signal-to-noise-ratio (SNR) and small snapshots.In addition,the proposed method can improve the detection probability and estimation accuracy of weak signal.
刘永军, 廖桂生, 杨东. 基于自适应迭代的强弱信号波达方向估计[J]. 电子学报, 2015, 43(7): 1425-1431.
LIU Yong-jun, LIAO Gui-sheng, YANG Dong. DOA Estimation for Strong and Weak Signals Based on Adaptive Iteration. Chinese Journal of Electronics, 2015, 43(7): 1425-1431.
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