Low-PSL Mismatched Filter Design for Coherent FDA Radar Using Phase-Coded Waveform.

In this letter, the low peak sidelobe level (PSL) mismatched filter (MSF) designed for a coherent frequency diverse array (FDA) radar using phase-coded waveform is proposed. Considering the space-time coupled characteristic of the coherent FDA, the proposed MSF incorporates the equivalent transmit beamforming and low sidelobe range compression simultaneously. The minimization of PSL in MSF design is modeled as a second-order cone programming (SOCP) problem and solved by convex optimization. Furthermore, two modified algorithms are proposed to improve the spatial clutter suppression and Doppler tolerance in the original framework. The proposed methods will help to expand the applications of the coherent FDA radar in wide-covered and high-resolution observation.