DOA Estimation with High Precision for Multiple Mainlobe Jammings
Yuan Hang Cheng, Daiyin Zhu, Jindong Zhang, Peng Xu · 2020
With the increase of the spatial degree of freedom (DOF), the radar system achieves multi-channels data processing and improves the survivability of the radar in the complex jamming environment. When the direction of arrival (DOA) of the jamming is close to that of the target, the conventional method will be ineffectiveness. In this paper, a DOA estimation method with high precision for multiple mainlobe jammings based on sparse reconstruction is proposed. The steering vectors are estimated based on the maximize signal-noise-ratio (MSNR) criterion. Besides, the oblique projection with ℓ1-norm singular value decomposition (OP- ℓ1-SVD) is performed to accomplish the jamming suppression and DOAs estimation of the target. The proposed method can be applied to the uniform linear array (ULA) model of a practical radar system and can resist at least two mainlobe jammings.