视场角受限的三维攻击角度控制导引律

Considering the limitation of field-of-view (FOV) and impact angle constraint of strapdown seeker in terminal guidance stage, a three-dimensional (3D) impact angle control guidance law based on proportional navigation guidance (PNG) is proposed. Firstly, the 3D vector guidance model and quaternion theory are used to predict the 3D PNG impact angle. Then, an impact angle control law of 3D PNG is designed based on spatial geometry principle. The closed-loop guidance dynamics is analyzed and the Lyapunov theory is used to prove the convergence of guidance error under limited FOV. The trajectory invariance of the guidance method is analyzed to ensure the effectiveness of the guidance method under the circumstance of velocity variation. Theoretical analysis and simulation results validate the effectiveness of the proposed method. The proposed method can provide a reference for the design of impact angle control guidance law with limited FOV.