The Hera near-Earth asteroid sample return mission: science requirements of the sample collector

Sears, D. W. G.; Allen, Carlton C.; Bell, M. S.; Bogard, D. D.; Britt, D. T.; Chapman, C. R.; Clark, B. C.; Dissley, R.; Franzen, Melissa; Goldstein, Joseph I.; Nishiizumi, K.; Nyquist, L. E.; Pieters, C. M.; Scheeres, Daniel J.; Scott, E. R. D.; Treiman, Allan H.

doi:10.1016/j.asr.2003.05.058

Cited by 9 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Exploration of comets and asteroids is one of the most complex missions in the future [1]. Asteroids exploration has been identified as a significant space mission; asteroids are believed to exist in the early stage of the solar system and be helpful to study solar system [2].…”

Section: Introductionmentioning

confidence: 99%

Finite-Time Spacecraft’s Soft Landing on Asteroids Using PD and Nonsingular Terminal Sliding Mode Control

Liu

Wang

et al. 2015

Mathematical Problems in Engineering

View full text Add to dashboard Cite

This paper presents a continuous control law of probe, which consists of PD (proportional-derivative) controller and nonsingular terminal sliding mode controller for probe descending and landing phases, respectively, in the case of the asteroid irregular shape and low gravity. The probe dynamic model is deduced in the landing site coordinate system firstly. Then the reference trajectory based on optimal polynomial in open-loop state is designed, with the suboptimal fuel consumption. Taking into account different characteristics of phases, PD controller and nonsingular terminal sliding mode controller can be employed in the descending phase and the landing phase, respectively, to track the designed reference trajectory. The controller which used the corresponding control methods can meet the motion characteristics and requirements of each stage. Finally simulation experiments are carried out to demonstrate the effectiveness of the proposed method, which can ensure the safe landing of probe and achieve continuous control.

show abstract

Section: Introductionmentioning

confidence: 99%