Monitoring the lunar capture of Chang'E-1 satellite by real-time reduction of the instantaneous state vectors

Guo, Lei; Li, J. L.; Qiao, Sanzheng; Tian, Feng

doi:10.1017/s1743921308019029

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“…The quality of the tracking data can be real-timely monitored and the trajectory can be measured rapidly and geometrically by positioning analysis. Especially during orbital maneuver, soft-landing and surface walking, because it is not easy to model precisely the forces exerted on probes, the positioning analysis can be used for rapid trace measurement [8][9][10][11].…”

Section: The Determination Of the Landing Trajectory Of Ce-satellite mentioning

confidence: 99%

Determination of the controlled landing trajectory of Chang’E-1 satellite and the coordinate analysis of the landing point on the Moon

Guo

Qian

et al. 2010

Chin. Sci. Bull.

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Based on the tracking observations of radio ranges and VLBI delays of Chang'E-1 (CE-1) satellite during the controlled landing on the Moon on March 1, 2009, the landing trajectory and the coordinates of the landing point are determined by positioning analysis. It is shown that the landing epoch (the emission epoch of the last signal) of CE-1 satellite on the Moon was at UTC8h13m6.51s. The lunar longitude, latitude and surface height of the landing point in the lunar primary axes frame are respectively 52.2732°, 1.6440° and -3.56 km (the reference lunar radius is 1738 km). The uncertainties are 0.0040°, 0.0168° and 0.18 km. The corresponding uncertainty in the tangential direction of the lunar surface is 0.52 km and the three-dimensional (3D) positioning uncertainty is 0.55 km. It is accordingly deduced that even with the present technical specifications of the radio ranges and VLBI delays, the 1 km 3D positioning precision could be guaranteed for the lander in the second stage of China's Lunar Exploration Project. Concerning the trace determination of the rover on the lunar surface, because only telemetry signal will be emitted, VLBI would be the sole tracking technique from the Earth. The application of the constraint of geocentric distance is shown to be helpful to improving the positioning precision. It is worthy to pay close attention to the applications of the same beam VLBI technique, the lunar topographic model and the on-board observations of the lander and rover to the position/trace determination of the rover. China's Lunar ExplorationProject, Chang'E-1 satellite, controlled landing on the Moon, trajectory measurement, VLBI Citation: Li J L, Guo L, Qian Z H, et al. Determination of the controlled landing trajectory of Chang'E-1 satellite and the coordinate analysis of the landing point on the Moon.

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Section: The Determination Of the Landing Trajectory Of Ce-satellite mentioning

confidence: 99%

Determination of the controlled landing trajectory of Chang’E-1 satellite and the coordinate analysis of the landing point on the Moon

Guo

Qian

et al. 2010

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

Monitoring the lunar capture of Chang'E-1 satellite by real-time reduction of the instantaneous state vectors

Cited by 1 publication

References 0 publications

Determination of the controlled landing trajectory of Chang’E-1 satellite and the coordinate analysis of the landing point on the Moon

Determination of the controlled landing trajectory of Chang’E-1 satellite and the coordinate analysis of the landing point on the Moon

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