Intra-vehicular Free-flyer High Accuracy Navigation Using Pseudolite
- Paper number
IAC-07-A5.I.-A3.I.B.22
- Author
Mr. Bo Yang, Northwestern Polytechnical University, China
- Coauthor
Prof. Xiaokui Yun, Northwestern Polytechnical University, China
- Coauthor
Mr. Yuan Jianping, Northwestern Polytechnical University, China
- Year
2007
- Abstract
Intra-vehicular free-flyer is a kind of robot which co-works with astronaut and assists management and operation of space station, crewed deep space spacecraft or space colonies. A highly intelligent Intra-vehicular free-flyer needs high positioning accuracy to navigate through space structures such as space station or future space colonies to fulfill complex space-sensitive information management tasks. The high positioning accuracy can be achieved by using Pseudolite installed within space structures which is actually a radio transmitter and transmit navigation signal to Intra-vehicular free-flyer. The advantage of Pseudolite positioning method is discussed by comparing with now existing technologies. Limitation on accuracy makes other technologies less attractive when highly space-sensitive operation and information management are considered in future missions. Pseudolite positioning principle, signal modulation, system configurations and navigation algorithms are included in this paper. In order to mitigate signal interference, pulse modulation is proposed. Both synchronous and asynchronous pseudolite system configurations are covered; algorithms applied to both configurations are also introduced. Positioning errors are discussed, error caused by radio propagation multipath effect is emphasized which is the dominant error within space structure environment. Our research theoretically demonstrated high accuracy positioning and navigation of Intra-vehicular free-flyer is possible to fulfill complex space-sensitive information management tasks. Centimeter or millimeter Intra-vehicular free-flyer positioning accuracy can be achieved by this scheme and it is better than now existing equipments.
- Abstract document
- Manuscript document
IAC-07-A5.I.-A3.I.B.22.pdf (🔒 authorized access only).
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