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BeiDou Geostationary Satellite Code Bias Modeling Using Fengyun-3C Onboard Measurements

by Kecai Jiang 1, Min Li 1,2,*, Qile Zhao 1,2,*, Wenwen Li 1 and Xiang Guo 1
1
GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
2
Collaborative Innovation Center of Geospatial Technology, 129 Luoyu Road, Wuhan 430079, China
*
Authors to whom correspondence should be addressed.
Sensors 2017, 17(11), 2460; https://doi.org/10.3390/s17112460
Received: 23 August 2017 / Revised: 23 October 2017 / Accepted: 25 October 2017 / Published: 27 October 2017
(This article belongs to the Section Remote Sensors, Control, and Telemetry)
This study validated and investigated elevation- and frequency-dependent systematic biases observed in ground-based code measurements of the Chinese BeiDou navigation satellite system, using the onboard BeiDou code measurement data from the Chinese meteorological satellite Fengyun-3C. Particularly for geostationary earth orbit satellites, sky-view coverage can be achieved over the entire elevation and azimuth angle ranges with the available onboard tracking data, which is more favorable to modeling code biases. Apart from the BeiDou-satellite-induced biases, the onboard BeiDou code multipath effects also indicate pronounced near-field systematic biases that depend only on signal frequency and the line-of-sight directions. To correct these biases, we developed a proposed code correction model by estimating the BeiDou-satellite-induced biases as linear piece-wise functions in different satellite groups and the near-field systematic biases in a grid approach. To validate the code bias model, we carried out orbit determination using single-frequency BeiDou data with and without code bias corrections applied. Orbit precision statistics indicate that those code biases can seriously degrade single-frequency orbit determination. After the correction model was applied, the orbit position errors, 3D root mean square, were reduced from 150.6 to 56.3 cm. View Full-Text
Keywords: BeiDou code biases; Fengyun-3C; onboard BeiDou; single-frequency orbit determination BeiDou code biases; Fengyun-3C; onboard BeiDou; single-frequency orbit determination
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Jiang, K.; Li, M.; Zhao, Q.; Li, W.; Guo, X. BeiDou Geostationary Satellite Code Bias Modeling Using Fengyun-3C Onboard Measurements. Sensors 2017, 17, 2460.

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