PSO-Based Low-SLL Pattern Synthesis for FDA in Range-Angle Space

Frequency diversity arrays (FDAs) have been widely concerned recently because of its flexible signal processing capability. Unlike the phased array, which changes the beam direction by controlling the phase difference, FDA achieves beam control with higher degrees-of-freedom (DOFs) by adopting a tiny frequency offset between adjacent elements. In this paper, a particle swarm optimization (PSO)-based pattern synthesis method is proposed for FDA. The transmission energy is concentrated in the region of interest by subarray, and the low sidelobe beam pattern can be realized. Simulation results show that the synthetic beampattern has −30dB sidelobe in range-angle space. In addition, this method has potential in the suppression of range-related, or range-angle-related clutter and / or interferences.