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Investigation on GEO satellite orbit determination based on CEI measurements of short baselines

Published online by Cambridge University Press:  02 May 2019

Zejun Liu ,
Lan Du ,
Yongxing Zhu ,
Zhihan Qian ,
Jinqing Wang  and
Shiguang Liang
Zejun Liu*
Affiliation:
(Information Engineering University, Zhengzhou 450001, China) (Shanghai Key Laboratory of Space Navigation and Positioning Techniques, Shanghai, 200030, China) (State Key Laboratory of Geo-Information Engineering Laboratory, Xi'an 710054, China)
Lan Du
Affiliation:
(Information Engineering University, Zhengzhou 450001, China)
Yongxing Zhu
Affiliation:
(State Key Laboratory of Geo-Information Engineering Laboratory, Xi'an 710054, China)
Zhihan Qian
Affiliation:
(Shanghai Key Laboratory of Space Navigation and Positioning Techniques, Shanghai, 200030, China)
Jinqing Wang
Affiliation:
(Shanghai Key Laboratory of Space Navigation and Positioning Techniques, Shanghai, 200030, China)
Shiguang Liang
Affiliation:
(Shanghai Key Laboratory of Space Navigation and Positioning Techniques, Shanghai, 200030, China)
*
(E-mail: liuzejun7994@126.com)
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Abstract

Connected-Element Interferometry (CEI) is a technique for measuring the phase delay of difference of Time Of Arrival (TOA) of a downlink radio signal to two antennae on a short baseline. This technique can use an atomic clock for time-frequency transmission and achieve intermediate accuracy angular tracking. Owing to the relatively short length of the baseline, the passive reception mode, and near real-time operation, CEI can be used to continuously monitor the orbit variations of both cooperative and non-cooperative satellites. In this paper, a small-scale CEI system of two orthogonal baselines (75 m × 35 m) is investigated to track a Geostationary Earth Orbit (GEO) Television (TV) satellite at 110·5°E. The phases are extracted from correlation results. The results show that the Root Mean Square (RMS) of the phase fitting residuals, if not calibrated, is within 2° at night and up to 10° in the daytime. After applying the calibration signal, the RMS of the phase fitting residuals in the daytime decreases to the same level at night. Comparing the phase delay with the a priori phase delay using Two-Line-Element (TLE) data, the integer ambiguity is successfully resolved. Finally, a batch algorithm is used to estimate the orbit of the GEO satellite, and the orbit determination accuracy is evaluated using the precise orbits provided by the China National Time Service Centre (NTSC). The results show that the accuracies in the radial direction and the cross-track direction are less than 1 km, and the Three-Dimensional (3D) position accuracy reaches the 2 km order of magnitude.

Keywords

Connected Element Interferometry (CEI)GEO satelliteInteger ambiguity determinationPrecise Orbit Determination (POD)
Type
Research Article
Information
The Journal of Navigation , Volume 72 , Issue 6 , November 2019 , pp. 1585 - 1601
Copyright
Copyright © The Royal Institute of Navigation 2019 

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