Rapid trajectory optimization for hypersonic reentry vehicles with multi-constraints

A rapid trajectory optimization was developed to handle the high dynamic and multi-constraints accompanying with hypersonic reentry vehicles. The equation of constraints in reentry process was established and the control variable of bank-angle was displayed as a subsection linear function of flight energy parameter during the process of trajectory optimization. The longitude constrained reference trajectory optimization was converted to a nonlinear optimization problem, and solved using sequential quadratic programming (SQP) method. The lateral motion was controlled by yaw angle tracking aspect angle and the error corridor of aspect angle was designed. The logic of back angle' reversal is developed to avoid traditional calculation by iteration. The simulation results indicate that the algorithm is able to generate a 10000 km range reentry trajectory in about 5s on the desktop computer. And the algorithm has fast calculation, high guidance precision and effective for implementation.