Deceptive Jamming Suppression with Vertical FDA for Diving Forward-Looking Array Radar

The frequency diverse array (FDA) radar can provide an increased degree of freedom (DOF) in the range domain and offer benefits in range-dependent interference suppression. This paper proposes a vertical frequency diverse array (VFDA)-based approach to suppress deceptive jamming for forward-looking array radar under diving motion. Specifically, the effects of diving motion and frequency increment on the beampattern and clutter spectrum are analyzed. Diving motion introduces azimuth information into the elevation dimension echo, and VFDA offers extra DOF in the elevation dimension to distinguish the false-target jamming from the true target. On this basis, an elevation filter is designed using the linearly constrained minimum variance (LCMV) criterion to mitigate deceptive jamming. Then, the space–time adaptive processing (STAP) processor with clutter compensation is applied to suppress the remaining clutter. In addition, the design criterion for the frequency increment and computational complexity analysis are provided. Numerical simulations verify the effectiveness of the proposed method. The signal model is developed for the diving forward-looking array radar based on the VFDA. The effects of the diving motion and frequency increment on the beampattern and clutter spectrum are analyzed. A novel VFDA STAP approach is proposed to mitigate clutter and deceptive jamming. The design criterion for the frequency increment is provided and the computational complexities are analyzed. MSC: 94A12