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

Zajdel, Radosław; Sośnica, Krzysztof; Bury, Grzegorz

doi:10.3390/rs9101049

Cited by 32 publications

(26 citation statements)

References 39 publications

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“…For GNSS, besides the six Keplerian parameters, seven parameters of the new Empirical CODE Orbit Model (ECOM2) were estimated, as they absorb much better the impact of solar radiation pressure for GLONASS and Galileo when compared to previous models dedicated to GPS orbit modeling . Despite the fact that 3 day orbital arcs are preferable for GNSS (Lutz et al, 2016), we generate 5 day overlapping arcs, as a trade-off between the validity and accuracy of ECOM2 parameters and the sufficient number of collected data (for details see Bury et al, 2017). Range biases constitute one of the most important issues when processing SLR observations to GNSS.…”

Section: Methodology and Datamentioning

confidence: 99%

“…SLR tracking of GNSS is typically used for the GNSS microwave-based orbit validation Montenbruck et al, 2015;Urschl et al, 2007). SLR-to-GNSS data can also be used for the GNSS orbit determination (Bury et al, 2017;Hackel et al, 2015;Pavlis, 1995), GNSS-SLR co-location in space that is independent from ground-based local ties (Bruni et al, 2018;Thaller et al, 2014), time transfer and GNSS onboard clock synchronization (Sadovnikov & Shargorodskiy, 2014), determination of GNSS antenna offsets , and the scale transfer from SLR to GNSS networks (Thaller et al, 2011).…”

Section: 1002/2017gl076850mentioning

confidence: 99%

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Contribution of Multi‐GNSS Constellation to SLR‐Derived Terrestrial Reference Frame

Sośnica

Bury

Zajdel

2018

Geophysical Research Letters

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All satellites of new Global Navigation Satellite Systems (GNSS) are equipped with laser retroreflectors dedicated to Satellite Laser Ranging (SLR). This paper demonstrates the contribution of SLR tracking of multi‐GNSS constellations to the improved SLR‐derived reference frame and scientific products. We show a solution strategy with estimating satellite orbits, SLR station coordinates, geocenter coordinates, and Earth rotation parameters using SLR observations to 2 Laser Geodynamics Satellites (LAGEOS) and 55 GNSS satellites: 1 GPS, 31 Globalnaya Navigatsionnaya Sputnikovaya Sistema, 18 Galileo, 3 BeiDou Inclined Geosynchronous Orbit, 1 BeiDou Medium Earth Orbit, and 1 Quasi‐Zenith Satellite System satellite for the period 2014.0–2017.4. Due to a substantial number of GNSS observations, the number of weekly solutions for some SLR stations, for example, Arkhyz, Komsomolsk, Altay, and Brasilia, is larger up to 41% in the combined LAGEOS + GNSS solution when compared to the LAGEOS‐only solution. The SLR observations to GNSS can transfer the orientation of the reference frame from GNSS to SLR solutions. As a result, the SLR‐derived pole coordinates and length‐of‐day estimates become more consistent with GNSS microwave‐based results. The root‐mean‐square errors of length‐of‐day are reduced from 122.5 μs/d to 43.0 μs/d, whereas mean offsets are reduced from −81.6 μs/d to 0.5 μs/d in LAGEOS only and in the combined LAGEOS + GNSS solutions, respectively.

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Section: Methodology and Datamentioning

confidence: 99%

Section: 1002/2017gl076850mentioning

confidence: 99%

Contribution of Multi‐GNSS Constellation to SLR‐Derived Terrestrial Reference Frame

Sośnica

Bury

Zajdel

2018

Geophysical Research Letters

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“…A joint adjustment of GNSS and SLR observations performed by Urschl et al (2007) provided an improvement of the determination of the semimajor axis of GNSS orbits. Urschl et al (2008) calculated the preliminary 9-day orbits of the very first Galileo, i.e., GIOVE-A, using solely SLR measurements and achieved the accuracy at the level of 0.1, 0.5, and 1.0 m in the radial, along-track, and cross-track direction, respectively. Montenbruck et al (2015b) calculated 14-day orbits using solely SLR data for two NavIC satellites, IRNSS-1A and IRNSS-1B.…”

Section: Slr Tracking Of Gnssmentioning

confidence: 99%

Multi-GNSS orbit determination using satellite laser ranging

Bury

Sośnica

Zajdel

2018

J Geod

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Galileo, BeiDou, QZSS, and NavIC are emerging global navigation satellite systems (GNSSs) and regional navigation satellite systems all of which are equipped with laser retroreflector arrays for range measurements. This paper summarizes the GNSSintensive tracking campaigns conducted by the International Laser Ranging Service and provides results from multi-GNSS orbit determination using solely SLR observations. We consider the whole constellation of GLONASS, all active Galileo, four BeiDou satellites: 1 MEO, 3 IGSO, and one QZSS. We analyze the influence of the number of SLR observations on the quality of the 3-day multi-GNSS orbit solution. About 60 SLR observations are needed for obtaining MEO orbits of sufficient quality with the root mean square (RMS) of 3 cm for the radial component when compared to microwave-based orbits. From the analysis of a minimum number of tracking stations, when considering the 3-day arcs, 5 SLR stations do not provide a sufficient geometry of observations. The solution obtained using ten stations is characterized with RMS of 4, 9, and 18 cm in the radial, along-track, and cross-track direction, respectively, for MEO satellites. We also investigate the impact of the length of orbital arc on the quality of SLR-derived orbits. Hence, 5-and 7-day arcs constitute the best solution, whereas 3-day arcs are of inferior quality due to an insufficient number of SLR observations and 9-day arcs deteriorate the along-track component. The median RMS from the comparison between 7-day orbital arcs determined using SLR data with microwave-based orbits assumes values in the range of 3-4, 11-16, and 15-27 cm in radial, along-track, and cross-track, respectively, for MEO satellites. BeiDou IGSO and QZSS are characterized by RMS values higher by a factor of 8 and 24, respectively, than MEO orbits.

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“…As a unique geodetic survey technology without ambiguity, the SLR technology has always been used to validate the GNSS microwave-based orbits externally and to investigate the deficiency of the error model in the microwave-based orbit determination [20,[25][26][27][28][29][30]. In this contribution, the motivation of the SLR validation is to flag and eliminate the worse SLR observations, which can improve the precision and stability of SLR-only orbit determination.…”

Section: Slr Validationmentioning

confidence: 99%

Precise Orbit Determination of BDS-2 and BDS-3 Using SLR

Yang

Nie

et al. 2019

Remote Sensing

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The BeiDou Navigation Satellite System (BDS) of China is currently in the hybrid-use period of BDS-2 and BDS-3 satellites. All of them are equipped with Laser Retroreflect Arrays (LRAs) for Satellite Laser Ranging (SLR), which can directly obtain an independent, sub-centimetre level of distance measurement. The main purpose of this contribution is to use the solely SLR Normal Points (NPs) data to determinate the precise orbit of BDS-2 and BDS-3 satellites, including one Geostationary Earth Orbit (GEO), three Inclined Geo-Synchronous Orbits (ISGO), and one Medium Earth Orbit (MEO) of BDS-2 satellites, as well as four MEO of BDS-3 satellites, from 1 January to 30 June 2019. The microwave-based orbit from Wuhan University (WUM) are firstly validated to mark and eliminate the bad SLR observations in our preprocessing stage. Then, the 3-, 5-, 7-, and 9-day arc solutions are performed to investigate the impact of the different orbital arc lengths on the quality of SLR-derived orbits and test the optimal solution of the multi-day arc. Moreover, the dependency of SLR-only orbit determination accuracy on the number of SLR observations and the number of SLR sites are discussed to explore the orbit determination quality of the 3-,5-, 7-, and 9-day arc solutions. The results indicate that (1) during the half-year time span of 2019, the overall Root Mean Square (RMS) of SLR validation residuals derived from WUM is 19.0 cm for BDS-2 GEO C01, 5.2-7.3 cm for three BDS-2 IGSO, 3.4 cm for BDS-2 MEO C11, and 4.4-5.7 cm for four BDS-3 MEO satellites respectively. (2) The 9-day arc solutions present the best orbit accuracy in our multi-day SLR-only orbit determination for BDS IGSO and MEO satellites. The 9-day overlaps median RMS of BDS MEO in RTN directions are evaluated at 3. 6-5.7, 12.4-21.6, and 15.6-23.9 cm respectively, as well as 5. 7-9.6, 15.0-36.8, and 16.5-35.2 cm for the comparison with WUM precise orbits, while these values of BDS IGSO are larger by a factor of about 3-10 than BDS MEO orbits in their corresponding RTN directions. Furthermore, the optimal average 3D-RMS of 9-day overlaps is 0.49 and 1.89 m for BDS MEO and IGSO respectively, as well as 0.55 and 1.85 m in comparison with WUM orbits. Owing to its extremely rare SLR observations, the SLR-only orbit determination accuracy of BDS-2 GEO satellite can only reach a level of 10 metres or worse. (3) To obtain a stable and reliable SLR-only precise orbit, the 7-day to 9-day arc solutions are necessary to provide a sufficient SLR observation quantity and geometry, with more than 50-80 available SLR observations at 5-6 SLR sites that are evenly distributed, both in the Northern and Southern Hemispheres.

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

Cited by 32 publications

References 39 publications

Contribution of Multi‐GNSS Constellation to SLR‐Derived Terrestrial Reference Frame

Contribution of Multi‐GNSS Constellation to SLR‐Derived Terrestrial Reference Frame

Multi-GNSS orbit determination using satellite laser ranging

Precise Orbit Determination of BDS-2 and BDS-3 Using SLR

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