%A BEN Liyan, ZHANG Rui, XIE Xianghua
%T A guidance algorithm for midcorrection of translunar trajectory
%0 Journal Article
%D 2020
%J Chinese Space Science and Technology
%R 10.16708/j.cnki.1000-758X.2020.0016
%P 29-
%V 40
%N 2
%U {http://zgkj.cast.cn/CN/abstract/article_11176.shtml}
%8 2020-04-25
%X A new guidance algorithm for midcorrection of translunar trajectory was presented. The algorithm was divided into two steps, i.e.,designing the initial solution and searching for the exact solution. First, the initial solution was generated using the pseudostate theory, and the Vinti prediction was adopted to improve the accuracy of the initial solution by eliminating the earth oblateness effect. Then, while searching for the exact solution, the state transition matrix was calculated by an analytical method based on the pseudostate theory. Because the initial solution with high accuracy is used, the difficulty of finding the solution for midcorrection of translunar trajectory is greatly reduced. Moreover, the calculation of the state transition matrix by using traditional numerical methods is omitted. Numerical simulations indicate that the algorithm is of high efficiency.