Influence of the Lander Size and Shape on the Ballistic Landing Motion

Zeng, Xia; Li, Ziwen; Wen, Tongge; Zhang, Y. L.

doi:10.1029/2021ea001952

Cited by 8 publications

(4 citation statements)

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“…[18]). It was shown previously in [16], [17], and [19] that the shape of the lander has a significant impact on its surface motion. Considering the spacecraft shape allows the effects like frictional torque and rolling resistance to be modeled, however it also requires an accurate shape of the body to be implemented.…”

Section: Surface Motionmentioning

confidence: 84%

“…These methods give insight into what dynamically is the minimum touchdown velocity of a certain location, but it cannot consider any additional constraints on the trajectory itself. The bouncing and surface motion of landers has also been investigated in detail in [15], [16], [17], [18], and [19]. These studies highlight the importance of implementing accurate and efficient models for the dynamics of this phase of the landing trajectory design as well as it can have a large influence on to the lander settling location and success of the landing itself.…”

Section: Introductionmentioning

confidence: 99%

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Robust Trajectory Design for Ballistic Landings on Dimorphos

Fodde

Feng

Vasile

2022

AIAA SCITECH 2022 Forum

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ESA's Hera mission is planning to land a probe on the surface of the secondary body of the Didymos binary asteroid system, called Dimorphos, using a ballistic landing strategy. Ballistic landings can be sensitive to uncertainties in the deployment of the lander and the environment models. Thus, the design of the ballistic landing trajectory needs to take into consideration both the minimization of the touchdown velocity and the robustness of the trajectory against uncertainties. In this research, a landing trajectory design algorithm that accomplishes both these tasks is developed. This is done using the Generalised Intrusive Polynomial Algebra (GIPA) method to propagate the uncertainties through the dynamical system. A novel addition to GIPA is introduced, which is able to obtain the probability distribution of the spacecraft state over time. The landing trajectory design method is tested using several different landing area sizes and locations. It is found that there is a large difference between the found minimal touchdown velocities between landing locations. Furthermore, a larger allowed landing area results in more deployment states being allowed, at the expense of higher touchdown velocities. The algorithm developed here thus allows for the design of robust ballistic landing trajectories for landing on small bodies like Dimorphos.

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