High Resolution DOA Estimation for Contiguous Target with Large Power Difference

Abstract

The Direction of arrival (DOA) for contiguous targets with a significant power difference, with fewer sensors and snapshots, is a challenging task. Our earlier work based on Modified Group delay-ℓ1-SVD [1] can correctly resolve contiguous targets with fewer sensors. The weights in Modified Group delay ℓ1-SVD were computed using the Hadamard product of MUSIC and Group delay (GD) weights. However, a significant power difference between the targets results in degraded performance. This is due to the incorrect MUSIC weights, which result in poor spatial resolution for contiguous targets with a significant power difference. Re-weighting the ℓ1-SVD with Capon-MUSIC and Capon-MUSIC GD weights helps estimate DOAs with a high spatial resolution at fewer sensors. Average-Root-Mean-Square-Error (ARMSE) and Resolution Probability are used to evaluate the performance of the proposed methods.