Dynamics and Modeling of Double Lunar-Swingby Trajectories.

Double Lunar-Swingby (DLS) trajeclories have received much attention due to its wide applications in the trajectory design of Multi-Mission and Multi-Purpose'. First, the DLS orbits are divided into two classes named Plane type and Backflip type according to their space configuration and characteristics. Then, the basic theory of swingby is shown based on two dynamics models of Zero-Sphere-of-Influence and CR3BP. Furthermore, both dynamics and modeling of Plane type DLS trajectory are discussed in two categories of application, and the principle and solution methods of Backflip type orbit is also summarized in detail. This study and survey about DLS trajectories could provide a new insight and reference for the interplanetary' mission of China. [ABSTRACT FROM AUTHOR]