Tracking and discriminating direction finding method based on robust capon beamforming and phase-locked loop

In order to compensate the impact of the antenna array steering vector mismatch and the phase measurement noise, the optimal measurement method is proposed for steering vector, and the tracking identification method of direction finding is designed, basing on the robust capon beamforming (RCB) and phase-locked loop. Firstly, using the RCB algorithm estimate the optimal signal steering vector, and then basing on the principle of phase-locked loop to closed-loop track target signal steering vector. After steady and accurate tracking of the steering vectors, referencing the principle of spread spectrum receiver pseudo-code phase detector, the direction of the target signal is determined. Simulation results show that the proposed method can compensate the impact of the steering vector mismatch and phase measurement noise, break through the restrictions of the angle correlation interval, and accurate measure the target signal direction.