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Sensors 2017, 17(6), 1260;

Chang’E-5T Orbit Determination Using Onboard GPS Observations

GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
Author to whom correspondence should be addressed.
Received: 15 April 2017 / Revised: 19 May 2017 / Accepted: 27 May 2017 / Published: 1 June 2017
(This article belongs to the Section Remote Sensors)
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In recent years, Global Navigation Satellite System (GNSS) has played an important role in Space Service Volume, the region enclosing the altitudes above 3000 km up to 36,000 km. As an in-flight test for the feasibility as well as for the performance of GNSS-based satellite orbit determination (OD), the Chinese experimental lunar mission Chang’E-5T had been equipped with an onboard high-sensitivity GNSS receiver with GPS and GLONASS tracking capability. In this contribution, the 2-h onboard GPS data are evaluated in terms of tracking performance as well as observation quality. It is indicated that the onboard receiver can track 7–8 GPS satellites per epoch on average and the ratio of carrier to noise spectral density (C/N0) values are higher than 28 dB-Hz for 90% of all the observables. The C1 code errors are generally about 4.15 m but can be better than 2 m with C/N0 values over 36 dB-Hz. GPS-based Chang’E-5T OD is performed and the Helmert variance component estimation method is investigated to determine the weights of code and carrier phase observations. The results reveal that the orbit consistency is about 20 m. OD is furthermore analyzed with GPS data screened out according to different C/N0 thresholds. It is indicated that for the Chang’E-5T, the precision of OD is dominated by the number of observed satellite. Although increased C/N0 thresholds can improve the overall data quality, the available number of GPS observations is greatly reduced and the resulting orbit solution is poor. View Full-Text
Keywords: Chang’E-5T; orbit determination; onboard GNSS receiver; C/N0; deep space navigation Chang’E-5T; orbit determination; onboard GNSS receiver; C/N0; deep space navigation

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Su, X.; Geng, T.; Li, W.; Zhao, Q.; Xie, X. Chang’E-5T Orbit Determination Using Onboard GPS Observations. Sensors 2017, 17, 1260.

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