Research on gravity-assist mechanism in elliptic restricted three-body model

To the Gravity-Assist technology in interplanetary exploration, basing on elliptic restricted three-body model (ERTP), we deeply research the relative between the independent variables and orbital change of gravity-assisted flight. On the assumption that ERTP, we mainly research the influence of eccentricity and phase angle of gravity-assisted planet on parameters change of captures and escapes, direct orbit and retrograde orbit by using integrated forward and integrated backward method. Taking the gravitational parameters of Earth-Moon system as an example, we analyze, in case of before and behind flyby, the influence of difference eccentricity and phase angle of gravity-assisted planet on orbit's energy and angle momentum, and summarize the corresponding the changing rule. These researches will present some significant references for trajectory design and application of gravity-assist technology.