DFRC Waveform Design for Ground-Air System Under Inaccurate Target Angle

In ground-air networks, dual-function radar and communication (DFRC) enables a base station (BS) to sense and send communication signals to autonomous aerial vehicles (AAVs) simultaneously, which has enormous potential. The emphasis of this letter is on the design of DFRC waveform for ground-air system under inaccurate target angle. The desired covariance matrix is considered to have the best radar performance in the presence of inaccurate target angle and the waveform design objective is to make the corresponding covariance matrix approximated to it. The constraints conclude multi-user interference (MUI) energy for high quality of communication and constant modulus for avoiding signal distortion. To address the problem that minimizes the covariance matrix difference under the constraints, we propose a block coordinate descent (BCD) method. Moreover, to ensure the problem feasible, we design an initial value acquisition strategy using bisection-based alternating direction method of multipliers (ADMM). Numerical results indicate that better communication and radar performance are achieved by the proposed method compared with existing methods.