Adaptive Proportional Guidance Law for Ground Stationary Target

According to the problem that perpendicular impact on the ground stationary target was required for some guided missiles, the adaptive proportional guidance law with terminal angular constraint was derived, which didn't need range information. On analyzing the longitudinal plane motion equation and lateral plane motion equation in guided phase, the guidance logic for perpendicular impact task was devised. And for the sake of robustness enhancement of the guidance law, an adaptive guidance parameter updating method was proposed. Simulation results show that compared with optimal guidance law, the guidance precision of adaptive proportional guidance law is less affected by initial velocity inclination angle and guidance order delay and order updating frequency, but is more affected by signal measurement with jam.