Customized Online Trajectory Planning for Planetary Pinpoint Landing

Planetary pinpoint landing is a key issue in the aerospace field, and the purpose of powered-descent guidance is to make the vehicle fly to the target point according to a planned trajectory and realize vertical landing. The purpose of this article is to realize a customized and efficient powered-descent guidance solver for online trajectory planning. Considering the actual engineering needs, the powered-descent guidance model is summarized and improved, and the original model is transformed into a second-order cone programming model by lossless convexification, linearization, discretization, scaling and other methods. By analyzing the characteristics of the landing problem, the general interior point method is improved. By using historical trajectory information to realize warm start, the efficiency of the powered-descent guidance solver is greatly improved. Considering the influence of aerodynamic drag, the vacuum powered descent guidance solver and atmospheric powered descent guidance solver are realized respectively, which have good performance in different landing environments.