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Sensors 2015, 15(12), 30403-30418; doi:10.3390/s151229805

A Novel Method for Precise Onboard Real-Time Orbit Determination with a Standalone GPS Receiver

1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 9 October 2015 / Revised: 20 November 2015 / Accepted: 1 December 2015 / Published: 4 December 2015
(This article belongs to the Special Issue Sensor Innovations for Spacecraft Guidance, Navigation, and Control)
View Full-Text   |   Download PDF [7091 KB, uploaded 4 December 2015]   |  

Abstract

Satellite remote sensing systems require accurate, autonomous and real-time orbit determinations (RTOD) for geo-referencing. Onboard Global Positioning System (GPS) has widely been used to undertake such tasks. In this paper, a novel RTOD method achieving decimeter precision using GPS carrier phases, required by China’s HY2A and ZY3 missions, is presented. A key to the algorithm success is the introduction of a new parameter, termed pseudo-ambiguity. This parameter combines the phase ambiguity, the orbit, and clock offset errors of the GPS broadcast ephemeris together to absorb a large part of the combined error. Based on the analysis of the characteristics of the orbit and clock offset errors, the pseudo-ambiguity can be modeled as a random walk, and estimated in an extended Kalman filter. Experiments of processing real data from HY2A and ZY3, simulating onboard operational scenarios of these two missions, are performed using the developed software SATODS. Results have demonstrated that the position and velocity accuracy (3D RMS) of 0.2–0.4 m and 0.2–0.4 mm/s, respectively, are achieved using dual-frequency carrier phases for HY2A, and slightly worse results for ZY3. These results show it is feasible to obtain orbit accuracy at decimeter level of 3–5 dm for position and 0.3–0.5 mm/s for velocity with this RTOD method. View Full-Text
Keywords: real-time orbit determination; GPS carrier phase; pseudo-ambiguity; decimeter precision; random walk real-time orbit determination; GPS carrier phase; pseudo-ambiguity; decimeter precision; random walk
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, F.; Gong, X.; Sang, J.; Zhang, X. A Novel Method for Precise Onboard Real-Time Orbit Determination with a Standalone GPS Receiver. Sensors 2015, 15, 30403-30418.

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