Bong-Gyun Park/Jong-Sun Ahn/Min-Jea Tahk
International Journal of Aeronautical and Space Sicences, vol. 12, no. 3, pp.283-287, 2011

Abstract : In this paper, minimum-fuel, two-dimensional trajectory optimization for soft lunar landing from a parking orbit to a desired landing site is addressed. The landing site is usually not considered when performing the trajectory optimization in order to handle the landing problem simply. However, to design the precise trajectories to land at the desired site, the landing site has to be considered as the terminal constraint. To convert the trajectory optimization problem into a parameter optimization problem, a pseudospcetral (PS) method is used, and C code for Feasible Sequential Quadratic Programming (CFSQP) is used as a numerical solver. To check that the results obtained are good solutions, the feasibility check is performed.

Keyword : Trajectory optimization, Pseudospectral (PS) method, Soft landing