考虑捷联导引头最小视场角约束的制导策略

This article proposes the problem of the minimum Field-of-View (FOV) angle constraint of the strapdown seeker in hypersonic missiles. Analysis of look angle kinematics indicates that the minimum FOV angle constraint cannot be met at the end of the trajectory when the missile attacks stationary targets, leading to target loss by the seeker. Furthermore, to decrease the distance of target loss, we propose a guidance strategy which can be applied to the guidance law with independent orders on longitudinal and lateral channels. When the minimum FOV angle constraint is about to unfulfilled, this strategy sustains the constraint by rolling and longitudinal maneuvering. In addition, a guidance strategy switch point is designed to avoid acceleration exceeding the constraint. The guidance strategy ends when reaching the switch point. Simulation in comparison proves the effectiveness of the proposed guidance strategy in considerably reducing the distance of target loss, which is beneficial to the accuracy improvement of terminal guidance.