Precise orbit determination for quad-constellation satellites at Wuhan University: strategy, result validation, and comparison

Guo, Jing; Xu, Xiaolong; Zhao, Qile; Liu, Jingnan

doi:10.1007/s00190-015-0862-9

Cited by 236 publications

(130 citation statements)

References 17 publications

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“…CODE solutions include satellites of the following systems: GPS, GLONASS-M, GLONASS-K, Galileo IOV, Galileo FOC, BeiDou-2 MEO, BeiDou-2 IGSO and QZSS. Besides CODE, there are five other ACs which deliver multi-GNSS orbit products in the framework of MGEX: Centre National d'Études Spatiales (CNES/CLS) [4], Helmholtz Centre Potsdam German Research Centre for Geosciences (GFZ) [5], Technische Universität München (TUM), Wuhan University (WU) [40] and Japan Aerospace Exploration Agency (JAXA) [41]. Products from all ACs can be included in the GOVUS service, which is one of the major plans for the future development.…”

Section: System Overview and Description Of Processing Flowmentioning

confidence: 99%

A New Online Service for the Validation of Multi-GNSS Orbits Using SLR

2017

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In the last decade, we have been witnessing a rapid development of the constellations of Global and Regional Navigation Satellite Systems (GNSS/RNSS). Besides the well-known GPS and GLONASS, newly developed systems such as Galileo, BeiDou, QZSS and NAVIC have become increasingly important. All satellites of new GNSS are equipped with laser retroreflector arrays (LRA) dedicated to Satellite Laser Ranging (SLR). SLR allows, e.g., an independent validation of microwave-based orbit products. Therefore, a fully operational online service called the multi-GNSS Orbit Validation Visualizer Using SLR (GOVUS) has been developed allowing for near real-time analysis of the quality of multi-GNSS orbits. The mean offsets of SLR residuals for Center for Orbit Determination in Europe (CODE) orbits in 2016 are at the level of −8, −38, −14, and −107 mm, for BeiDou, Galileo, GLONASS, and QZSS, respectively, with the standard deviations of 66, 36, 29, and 100 mm. Moreover, GOVUS can be used as a database containing information on equipment used at SLR stations and multi-GNSS satellite parameters. This paper includes a comprehensive description of the functionality and the structure of the developed service with exemplary analyses. The paper points out the most critical issues, limitations and challenges of multi-GNSS and SLR tracking network in the context of the SLR orbit validation. The goal of the paper and GOVUS itself is to determine: (1) what is the current quality of multi-GNSS orbits validated using SLR results; (2) what kinds of systematic errors can affect GNSS orbits and SLR observations; and (3) how to provide the online analysis tools to the broadest possible multi-GNSS community. The service has been officially operating since March 2017 as the Associate Analysis Center of the International Laser Ranging Service (ILRS ACC).

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Section: System Overview and Description Of Processing Flowmentioning

confidence: 99%

A New Online Service for the Validation of Multi-GNSS Orbits Using SLR

2017

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“…In recent years, BDS POD and GPS/ BDS combined POD have been investigated Shi et al 2012;Zhao et al 2013;Guo et al 2015;Li et al 2015). With the establishment of the multi-GNSS experiment (MGEX, Montenbruck et al 2014) by the International GNSS Service (IGS, Dow et al 2009), several analysis centers (ACs) have provided BDS precise orbit and clock products since 2013, e.g., the Center for Orbit Determination in Europe, GeoForschungsZentrum, the European Space Agency, and Wuhan University.…”

Section: Introductionmentioning

confidence: 99%

“…With the establishment of the multi-GNSS experiment (MGEX, Montenbruck et al 2014) by the International GNSS Service (IGS, Dow et al 2009), several analysis centers (ACs) have provided BDS precise orbit and clock products since 2013, e.g., the Center for Orbit Determination in Europe, GeoForschungsZentrum, the European Space Agency, and Wuhan University. The quality assessment for BDS orbit products provided by MGEX ACs shows the 3D accuracy is at decimeter to meter level for GEO, 0.2-0.3 m for IGSO, and 0.1-0.2 m for MEO satellites (Guo et al 2015(Guo et al , 2016a. Also, some aspects affecting the orbit quality of BDS POD have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Improving BDS integer ambiguity resolution using satellite-induced code bias correction for precise orbit determination

et al. 2017

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Successful resolution of integer ambiguity over long baselines is a key to improve the accuracy of precise orbit determination for global navigation satellite system satellites. The satellite-induced code bias (SCB) found in BDS signals severely prevents the BDS integer ambiguity resolution (AR) of long baselines. We present BDS AR using satellite-induced code bias correction for precise orbit determination. The impacts of the BDS SCB on double-difference AR for different baseline length and satellite type are first assessed. About one month of BDS tracking data collected from the MGEX and Fugro network are processed for precise orbit determination using independent single-system method. The results of orbit overlap comparison and satellite laser ranging (SLR) validation suggest that the SCB has no obvious impacts on BDS float solutions; however, it shows significant implications on ambiguity-fixed solutions, especially for MEO satellites and long baselines. When applying the SCB correction model to BDS AR, the 3D mean RMS of overlapping orbit are reduced from 14.02 to 10.46 cm for IGSO and from 10.97 to 6.89 cm for MEO satellite, with the improvement of 25.4 and 37.2%. The contribution of AR with SCB correction on orbit accuracy of BDS could reach the level close to that of GPS. SLR residuals also confirm the improvement.

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“…We focus only on IGSO and MEO satellites. Satellite laser ranging (SLR) validation indicates that the orbit accuracy has reached about 10 and 5 cm for BDS IGSO and MEO satellites, respectively (Guo et al 2016). However, once those satellites switch to the orbit-normal (ON) orientation from the yaw-steering (YS) mode, the orbit accuracy degrades dramatically.…”

Section: Introductionmentioning

confidence: 99%

“…This attitude-related POD issue has been analyzed in Wang et al (2013) and Guo et al (2013). The orbit accuracy could be improved significantly by introducing an additional empirical constant acceleration bias with a relatively tight constraint of 1.0 9 10 -10 m/s 2 in the along-track direction to the purely empirical CODE model Guo et al 2016). However, the latter study still shows undesirable systematic errors that depend on the solar elevation angle b above the satellite orbit plane and the argument l of the satellite with respect to the midnight point in the orbit plane, as seen in SLR residuals of BDS IGSO satellites.…”

Section: Introductionmentioning

confidence: 99%

Comparison of solar radiation pressure models for BDS IGSO and MEO satellites with emphasis on improving orbit quality

et al. 2016

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In order to simplify the attitude control for inclined geosynchronous orbit (IGSO) and medium earth orbit (MEO) satellites of the BeiDou Navigation Satellite System (BDS) in eclipse seasons, two attitude modes, namely yaw-steering (YS) and orbit-normal (ON) mode are used. Significant accuracy degradation is observed for the orbits determined with the purely empirical CODE solar radiation pressure (SRP) model when these satellites switch to the ON mode. In addition, even though BDS IGSO satellites are in the YS mode, the orbits determined with the CODE SRP model show undesirable systematic errors that depend on the elevation angle b of the sun above the satellite orbit plane and on the argument angle l of satellite with respect to the midnight point in the orbit plane as identified from satellite laser ranging residuals. We present the yaw attitude model used for the bus of BDS IGSO and MEO satellites, and constrain the mode-switch conditions by the b and l angles. In order to overcome the deficiency of the purely empirical CODE SRP model for precise orbit determination (POD) of BDS IGSO and MEO satellites in the ON mode, an additional constant acceleration bias with tight constraint of 1.0 9 10 -10 m/s 2 in the along-track direction has been introduced to the CODE SRP model, and it is denoted as the C5a model. Although the orbit accuracy of IGSO and MEO satellites is significantly improved in the ON mode, the b-and l-dependent systematic orbit errors of BDS IGSO are not reduced. Hence, with the presented yaw attitude model of the satellite bus and two assumed orientations of solar panels, the adjustable box-wing (ABW) model has been modified. Two modified ABW models are compared with the purely empirical CODE and C5a model. Based on the analysis of real data of 2014, the C5a model shows the best performance in the ON mode among the four SRP models. Although two modified ABW models show a rather worse performance for POD in the ON mode, particularly in the cross-track and radial direction, the b-and l-dependent systematic orbit errors of BDS IGSO satellites are reduced. This provides a new insight and a possible way to improve the orbits of BDS IGSO and MEO satellites.

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Precise orbit determination for quad-constellation satellites at Wuhan University: strategy, result validation, and comparison

Cited by 236 publications

References 17 publications

A New Online Service for the Validation of Multi-GNSS Orbits Using SLR

A New Online Service for the Validation of Multi-GNSS Orbits Using SLR

Improving BDS integer ambiguity resolution using satellite-induced code bias correction for precise orbit determination

Comparison of solar radiation pressure models for BDS IGSO and MEO satellites with emphasis on improving orbit quality

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