The 2-D normalized spatial spectrum of the four algorithms when the inter-spacing of array equals 1.5 times the smallest wavelength. The scenario is composed by two sources located at θ
1 =10° and θ
2 =30°, N = 10 sensors, T=1200 time snapshots, and SNR = 10 dB. The ratio of bandwidth to central frequency is 40%. This figure shows the estimated performance of the proposed method when the array inter-spacing is enlarged to 1.5 times wavelength associated with the highest signal frequency.