NDLI: A digital open-loop Doppler processing prototype for deep-space navigation

Content Provider	Springer Nature Link
Author	Jian, NianChuan Shang, Kun Zhang, SuJun Wang, MingYuan Shi, Xian Ping, JingSong Yan, JianGuo Tang, GeShi Liu, JunZe Qiu, Shi Fung, Lai Wo Zhang, Hua Wang, Zhen Gou, Wei
Copyright Year	2009
Abstract	A prototype based on digital radio technology with associated open-loop Doppler signal processing techniques has been developed to measure a spacecraft’s line-of-sight velocity. The prototype was tested in China’s Chang’E-1 lunar mission relying on S-band telemetry signals transmitted by the satellite, with results showing that the residuals had a RMS value of ∼3 mm/s (1 σ) using 1-sec integration, which is consistent with the Chinese conventional USB (Unified S-Band) tracking system. Such precision is mainly limited by the short-term stability of the atomic (e.g. rubidium) clock at the uplink ground station. It can also be improved with proper calibration to remove some effects of the transmission media (such as solar plasma, troposphere and ionosphere), and a longer integration time (e.g. down to 0.56 mm/s at 34 seconds) allowed by the spacecraft dynamics. The tracking accuracy can also be increased with differential methods that may effectively remove most of the long-term drifts and some of the short-term uncertainties of the uplink atomic clock, thereby further reducing the residuals to the 1 mm/s level. Our experimental tracking data have been used in orbit determination for Chang’E-1, while other applications (such as the upcoming YH-1 Mars orbiter) based on open-loop Doppler tracking will be initiated in the future. Successful application of the prototype to the Chang’E-1 mission in 2008 is believed to have great significance for China’s future deep space exploration.
Starting Page	1849
Ending Page	1857
Page Count	9
File Format	PDF
ISSN	16721799
Journal	Science in China Series G
Volume Number	52
Issue Number	12
e-ISSN	18622844
Language	English
Publisher	SP Science in China Press
Publisher Date	2010-01-14
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	open-loop Doppler differential Doppler deep space navigation Chang’E-1 Astronomy, Observations and Techniques Classical Continuum Physics Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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