Superresolution DoA Estimation With Circular Arrays Using Signal Segregation Algorithm in Conjunction With a Nulls-Synthesis Method

A Super Resolution and Highly Stable Technique for Direction of Arrival Estimation of Coherent Sources for Mm-Wave Radars

“…In this section, the resolution Δ θ min of the proposed technique is evaluated and compared to the resolution of the super-resolution DOA estimation algorithm for correlated signals introduced in [25]. It is based on the hybrid combination between the array signal segregation using an iterative approach (ASSIA) and the closely-spaced nulls synthesis method (CNSM), and it is denoted as the ASSIA-CNSM algorithm.…”

“…It is based on the hybrid combination between the array signal segregation using an iterative approach (ASSIA) and the closely-spaced nulls synthesis method (CNSM), and it is denoted as the ASSIA-CNSM algorithm. Consider M = 9 elements ULA with half power beamwidth HPBW = 11.34 • , N = 2 closely angular spaced coherent signals impinging on the array from the directions θ 1 = 10 • and θ 2 = 11 • with angular spacing Δ θ = θ 2 − θ 1 = 1 • , K = 2000 samples, and SNR = 5 dB as in [25]. The simulations revealed that the proposed technique succeeds in detecting the DOAs of the two sources at 10 • and 11.1 • , respectively as shown in Fig.…”

“…Recently, many real time DOA estimation algorithms are introduced and well experimentally tested in [23][24][25]. In [23], an experimental DOA estimation using the co-array algorithm is introduced.…”

“…The performances of these algorithms are experimentally evaluated, and the measurements show that their performances are highly affected by the multipath propagation and the coupling between antenna elements. In [25], a super resolution DOA estimation algorithm for correlated signals detection using circular antenna arrays is introduced. The experimental measurements show the effectiveness of the algorithm in detecting closely angular spaced sources with angular spacing of (0.15 BW) where BW is the half power beamwidth of the main beam.…”

“…Consequently, the array extension increases the resolution while the utilization of the FFT enhances the SNR. Several simulation scenarios are carried to verify the superiority of the proposed technique compared to the other modern DOA estimation techniques such as FBSS [8], VSS [9], SVD [11], MV-SVD [14], and the array signal segregation using an iterative approach (ASSIA) combined with the closely-spaced nulls synthesis method (CNSM) that is denoted as the ASSIA-CNSM algorithm [25]. Multiple aspects of comparison were covered including the number of detectable sources, stability, mean square error, and angular resolution versus the signal to noise ratio.…”