期刊
ADVANCES IN SPACE RESEARCH
卷 54, 期 9, 页码 1888-1900出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2014.07.009
关键词
Pinpoint landing; Powered descent phase; Integrated Doppler radar; Mars Orbiter
类别
资金
- National Basic Research Program of China (973 Program) [2012CB720000]
- National Natural Science Foundation of China [61374216, 61304248, 61304226]
- Research Fund for the Doctoral Program of Higher Education of China [20111101110001]
- Science and Technology Innovation Team of Beijing Institute of Technology
Pinpoint landing (within 100 m from the target) is essential for future Mars exploration missions. This paper deals with one aspect of the pinpoint landing architecture the navigation performance improvement during the powered descent phase, and proposes an innovative navigation scheme to obtain the vehicle complete and accurate states. On the basis of dead reckoning relying on the Inertial Measurement Unit, measurements of the Integrated Doppler Radar are adopted to correct the vehicle velocity and altitude. Distance between the vehicle and one Mars Orbiter as well as their line-of-sight relative velocity is measured by a radio sensor, and integrated in the filter to correct the vehicle horizontal position. The innovative navigation system is based on an Extend Kalman Filter. Two observation schemes are developed. One considers measurements of the Integrated Doppler Radar and radio range measurement. Another further considers radio velocity measurement. The performance of the innovative navigation scheme is greatly influenced by the position,of the Mars Orbiter with respect to the target. Stochastic analyses are performed to obtain optimal locations of Mars Orbiter. Finally, the innovative navigation scheme performances are assessed through stochastic simulations. Its performance improvements are demonstrated by comparison with the Integrated Doppler Radar only navigation scheme. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved.
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