China's second lunar explora- tion satellite Chang'e 2 was launched on October 1 2010 from the Xichang Satellite Launch Center. The satellite was sent directly into an Earth-moon transfer orbit on a LM-3C laun...China's second lunar explora- tion satellite Chang'e 2 was launched on October 1 2010 from the Xichang Satellite Launch Center. The satellite was sent directly into an Earth-moon transfer orbit on a LM-3C launch vehicle. Five展开更多
In this paper, the method of reliability test profile construction for air-launched spacecraft is analyzed, in order to effectively carry out air-launched spacecraft flight reliability test. The flight mission profile...In this paper, the method of reliability test profile construction for air-launched spacecraft is analyzed, in order to effectively carry out air-launched spacecraft flight reliability test. The flight mission profile and environment profile of air-launched spacecraft are formed. Meanwhile, the method of temperature stress, vibration stress, electronic stress and humidity stress of external spacecraft under different mission profiles are calculated. Finally, this paper takes an airborne electronic product as an example, and a reliability test profile is designed by correction of the experimental section with measured data.展开更多
There are a variety of applications for asteroid simulants in asteroid studies for science advances as well as technology maturation.For specific purpose,it usually requires purpose-specialized simulant.In this study,...There are a variety of applications for asteroid simulants in asteroid studies for science advances as well as technology maturation.For specific purpose,it usually requires purpose-specialized simulant.In this study,we designed and developed a set of prototype simulants as S-type asteroid surface materials analogue based on H,L,and LL ordinary chondrites’mineralogy and terrestrial observations of near-earth asteroid 2016 HO3,which is the Chinese sample return mission target.These simulants are able to simulate morphology and reflectance characteristics of asteroid(469219)2016 HO3 and,thus,to be used for engineering evaluation of the optical navigation system and the sampling device of the spacecraft during the mission phase.Meanwhile,these prototype simulants are easily to modify to reflect new findings on the asteroid surface when the spacecraft makes proximate observations.展开更多
Collocating geostationary satellites sharing the same position is much demanded for satellite operation recently,the separation strategies are adopted to safeguard the satellites collocated of leaving the relative dis...Collocating geostationary satellites sharing the same position is much demanded for satellite operation recently,the separation strategies are adopted to safeguard the satellites collocated of leaving the relative distance beyond collision with different sets of orbit parameters.This paper presents the mathematical prototypes which establish the allowable relative distance with uncertainty of orbital determination(OD),as well as the orbital element offset for each pair of collocated satellites,and puts forward algorithms to build such relationship to face the challenge of putting three satellites sharing the same position,the algorithms to allocate the longitude,eccentricity and inclination for each satellite are also given to ascertain that the mathematical prototypes are the guide specification to design collocation strategy for geostationary satellites.展开更多
基金supported by a contract between General Motors Company and Tsinghua University,National Natural Science Foundation of China(61425027,60736027,61021063,61074034,61174105)
文摘China's second lunar explora- tion satellite Chang'e 2 was launched on October 1 2010 from the Xichang Satellite Launch Center. The satellite was sent directly into an Earth-moon transfer orbit on a LM-3C launch vehicle. Five
文摘In this paper, the method of reliability test profile construction for air-launched spacecraft is analyzed, in order to effectively carry out air-launched spacecraft flight reliability test. The flight mission profile and environment profile of air-launched spacecraft are formed. Meanwhile, the method of temperature stress, vibration stress, electronic stress and humidity stress of external spacecraft under different mission profiles are calculated. Finally, this paper takes an airborne electronic product as an example, and a reliability test profile is designed by correction of the experimental section with measured data.
基金This work was supported by the Civil Aerospace Pre-research Project(D020302)the Qian Xuesen Laboratory Innovation Funds(Y-KC-WY-99-ZC-005).
文摘There are a variety of applications for asteroid simulants in asteroid studies for science advances as well as technology maturation.For specific purpose,it usually requires purpose-specialized simulant.In this study,we designed and developed a set of prototype simulants as S-type asteroid surface materials analogue based on H,L,and LL ordinary chondrites’mineralogy and terrestrial observations of near-earth asteroid 2016 HO3,which is the Chinese sample return mission target.These simulants are able to simulate morphology and reflectance characteristics of asteroid(469219)2016 HO3 and,thus,to be used for engineering evaluation of the optical navigation system and the sampling device of the spacecraft during the mission phase.Meanwhile,these prototype simulants are easily to modify to reflect new findings on the asteroid surface when the spacecraft makes proximate observations.
基金supported by the National Hi-Tech Research and Development Program of China ("863"Project)(Grant No.2012AA7040015)
文摘Collocating geostationary satellites sharing the same position is much demanded for satellite operation recently,the separation strategies are adopted to safeguard the satellites collocated of leaving the relative distance beyond collision with different sets of orbit parameters.This paper presents the mathematical prototypes which establish the allowable relative distance with uncertainty of orbital determination(OD),as well as the orbital element offset for each pair of collocated satellites,and puts forward algorithms to build such relationship to face the challenge of putting three satellites sharing the same position,the algorithms to allocate the longitude,eccentricity and inclination for each satellite are also given to ascertain that the mathematical prototypes are the guide specification to design collocation strategy for geostationary satellites.
