Abstract
In order to improve the precision of GLONASS orbits, this paper presents a method to connect the data segments of a single station-satellite pair to increase the observation continuity and, consequently, the strength of the precise orbit determination (POD) solution. In this method, for each GLONASS station-satellite pair, the wide-lane ambiguities derived from the Melbourne–Wübbena combination are statistically tested and corrected for phase integer offsets and then the same is carried out for the narrow-lane ambiguities calculated from the POD solution. An experimental validation was carried out using one-month GNSS data of a global network with 175 IGS stations. The result shows that, on average, 27.1% of the GLONASS station-satellite pairs with multiple data segments could be connected to a single long observation arc and, thus, only one ambiguity parameter was estimated. Using the connected data, the GLONASS orbit overlapping RMS at the day boundaries could be reduced by 19.2% in ideal cases with an averaged reduction of about 6.3%.
Highlights
GLONASS is currently another Global Navigation Satellite System (GNSS) with full operational capability other than GPS
We present a method for data connection to improve GLONASS orbit quality by using the connected data
Since the reliable GLONASS ambiguity resolution over long baselines is not yet available, we developed a method for data connection to increase the strength of global network solutions
Summary
GLONASS is currently another Global Navigation Satellite System (GNSS) with full operational capability other than GPS. From 2001, the International GNSS Service (IGS) [2] established the International GLONASS Service Pilot Project (IGLOS-PP) [3] Through these efforts POD of the GLONASS constellation has been gradually improved [4,5,6,7] and its orbit precision currently reaches the centimeter level. In the IGS data processing at CODE (Center for Orbit Determination in Europe), for baselines shorter than 200 km, the GLONASS ambiguity resolution is enabled for all satellites, whereas for longer baselines only ambiguities of the same frequency channels are considered in order to improve the orbit quality [18]. It is demonstrated that most observation segments, even that from separated satellite passes with a data gap of hours, can be connected Inspired by this fact, we present a method for data connection to improve GLONASS orbit quality by using the connected data. The performance of the data connection and the improvement on GLONASS orbits in terms of overlapping RMS are presented and investigated in subsequent sections, followed by conclusions and suggestions
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