A New Method of Rapid Trajectory for SAR Imaging Terminal Guidance

Based on hp- adaptive pseudospectral method,a new way in solving optimal control program,SAR imaging terminal guidance trajectory optimization problem is studied.Firsdy,minimal beam dwell time is selected as objective function.SAR imaging guidance trajectory optimization model is established by considerating SAR imaging constraints,missile overload constraints and missile dynamic constraints.Then the model is solved by hp- adaptive pseudospectral method.Simulation results show that hp- adaptive pseudospectral method combines the merits of segment pseudospectral's high computational efficiency and globle pseudospectral's fast convergence through self adaptive segment number and collocation number.It can generate a smooth,precise optimal trajectory.Compared with trajectory optimization using direct shooting method,hp-adaptive pseudospectral method has less computation time.This method benefits to the project of SAR imaging terminal guidance.