Grating-Lobe Clutter Suppression by Designing Transmit Beamforming in Uniform Subarray STAP

This paper deals with grating-lobe clutter suppression problem by designing the transmit beamforming (TB) in the uniform subarray (US) configuration. In order to suppress the grating-lobe clutter of the main-lobe area in the conventional space-time adaptive processing (STAP), we propose an appropriate TB in an active array. Firstly, we utilize the information of grating-lobe locations and the respective clutter power to construct a transmit covariance matrix (TCM). Then, the TB can be designed resorting to the minimum variance distortionless response (MVDR) algorithm with the reconstructed TCM. Numerical results illustrate that the proposed method can mitigate the grating-lobe clutter effectively with a higher output signal-to-clutter-plus-noise ratio (SCNR) than traditional STAP.