Research Article

Direction-of-Arrival Estimation of Closely Spaced Emitters Using Compact Arrays

Figure 2

Summary of DOA estimations using MPM for a four-element ULA with interelement separation varying from to . The two incoming signals are from the directions of , and , , , and , with an SNR of 5 dB. (a) Average biases of the estimated directions; (b) biases of the estimation of signal 1 and signal 2.
(a) Average Bias 
(b) Bias of Signal 1 and 2