Adaptive Reentry Guidance Law for Onboard Changing Attack Objective

The trajectory tracking problem was transformed into a trajectory state regulation problem which is a linear time varying(LTV) system.An adaptive reentry onboard guidance law based on pseudo-spectral method was developed and simulated.Simulation results indicate that the reentry guidance law can track new reference trajectory with good dynamic performance and accuracy after the reference trajectory changed.One of the most important advantages is that the reentry guidance law can work well onboard without explicit integral and gain schedule.