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

Sośnica, Krzysztof; Bury, Grzegorz; Zajdel, Radosław

doi:10.1002/2017gl076850

Cited by 21 publications

(18 citation statements)

References 29 publications

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“…The UT1-UTC estimates based on LAGEOS data are strongly affected by correlations of the UT1-UTC and drifts of satellite ascending nodes. Adding Sentinel-3 satellites with fixed orbits stabilizes the relative orientation between terrestrial and celestial frames in a similar way as adding SLR observations to GNSS [42]. Table 4.…”

Section: Geocenter From the Combined Lageos+sentinel Solutionsmentioning

confidence: 99%

Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites

et al. 2019

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Sentinel-3A/3B (S3A/B) satellites are equipped with a number of precise instruments dedicated to the measurement of surface topography, sea and land surface temperatures and ocean and land surface color. The high-precision orbit is guaranteed by three instruments: Global Positioning System (GPS) receiver, laser retroreflector dedicated to Satellite Laser Ranging (SLR) and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) antenna. In this article, we check the possibility of using SLR observations and GPS-based reduced-dynamic orbits of active S3A/B satellites for the determination of global geodetic parameters, such as geocenter motion, Earth rotation parameters (ERPs) and the realization of the terrestrial reference frame, based on data from 2016-2018. The calculation process was preceded with the estimation of SLR site range biases, different network constraining tests and a different number of orbital arcs in the analyzed solutions. The repeatability of SLR station coordinates based solely on SLR observations to S3A/B is at the level of 8-16 mm by means of interquartile ranges even without network constraining in 7-day solutions. The combined S3A/B and LAGEOS solutions show a consistency of estimated station coordinates better than 13 mm, geocenter coordinates with a RMS of 6 mm, pole coordinates with a RMS of 0.19 mas and Length-of-day with a RMS of 0.07 ms/day when referred to the IERS-14-C04 series. The altimetry observations have to be corrected by the geocenter motion to obtain unbiased estimates of the mean sea level rise. The geocenter motion is typically derived from SLR measurements to passive LAGEOS cannonball-like satellites. We found, however, that SLR observations to active Sentinel satellites are well suited for the determination of global geodetic parameters, such as Earth rotation parameters and geocenter motion, which even further increases the potential applications of Sentinel missions for deriving geophysical parameters.

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Section: Geocenter From the Combined Lageos+sentinel Solutionsmentioning

confidence: 99%

Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites

et al. 2019

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“…Therefore, the relevance of Etalon-1/-2 data is thus marginal. The contribution of other geodetic satellites, such as Starlette, Stella, and Ajisai (Sośnica et al 2014;Sośnica 2014;Bloßfeld et al 2018), active low Earth-orbiting satellites (Arnold et al 2018;Guo et al 2018;Hellerschmied et al 2018;Strugarek et al 2019), as well as the constellation of Global Navigation Satellite Systems (GNSS) (Thaller et al 2011;Zajdel et al 2017;Sośnica et al 2018Sośnica et al , 2019 is still being investigated by many researchers. SLR integrates the three major pillars of the Global Geodetic Observing System (GGOS) (Plag and Pearlman 2009), i.e., the Earth gravity field, Earth rotation, and Earth geometry in one common adjustment (Bloßfeld et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Impact of network constraining on the terrestrial reference frame realization based on SLR observations to LAGEOS

Zajdel

Sośnica

Drożdżewski

et al. 2019

J Geod

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The Satellite Laser Ranging (SLR) network struggles with some major limitations including an inhomogeneous global station distribution and uneven performance of SLR sites. The International Laser Ranging Service (ILRS) prepares the time-variable list of the most well-performing stations denoted as 'core sites' and recommends using them for the terrestrial reference frame (TRF) datum realization in SLR processing. Here, we check how different approaches of the TRF datum realization using minimum constraint conditions (MCs) and the selection of datum-defining stations affect the estimated SLR station coordinates, the terrestrial scale, Earth rotation parameters (ERPs), and geocenter coordinates (GCC). The analyses are based on the processing of the SLR observations to LAGEOS-1/-2 collected between 2010 and 2018. We show that it is essential to reject outlying stations from the reference frame realization to maintain a high quality of SLR-based products. We test station selection criteria based on the Helmert transformation of the network w.r.t. the a priori SLRF2014 coordinates to reject misbehaving stations from the list of datum-defining stations. The 25 mm threshold is optimal to eliminate the epoch-wise temporal deviations and to provide a proper number of datum-defining stations. According to the station selection algorithm, we found that some of the stations that are not included in the list of ILRS core sites could be taken into account as potential core stations in the TRF datum realization. When using a robust station selection for the datum definition, we can improve the station coordinate repeatability by 8%, 4%, and 6%, for the North, East and Up components, respectively. The global distribution of datum-defining stations is also crucial for the estimation of ERPs and GCC. When excluding just two core stations from the SLR network, the amplitude of the annual signal in the GCC estimates is changed by up to 2.2 mm, and the noise of the estimated pole coordinates is substantially increased.

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“…The performance of the combined solution based on LAGEOS and GNSS was assessed by Sośnica et al (2018a). However, the results from the SLR-to-GNSSonly solutions have not been evaluated so far.…”

Section: Introductionmentioning

confidence: 99%

Estimating global geodetic parameters using SLR observations to Galileo, GLONASS, BeiDou, GPS, and QZSS

Sośnica

Bury

Zajdel

et al. 2019

Earth Planets Space

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All Galileo, GLONASS, QZSS, and BeiDou satellites are equipped with laser retroreflector arrays dedicated to satellite laser ranging (SLR). Using SLR data to new GNSS systems allows for estimating global geodetic parameters, such as Earth rotation parameters, global scale, and geocenter coordinates. In this study, we evaluate the quality of global geodetic parameters estimated on a basis of SLR tracking of new GNSS satellites and the combined solution based on SLR observations to GNSS and LAGEOS. We show that along with a progressive populating of Galileo orbital planes, the quality of geocenter components based on SLR-GNSS data has been improved to the level of 6 and 15 mm for equatorial and polar geocenter components, respectively. The scale of the reference frame and the geocenter coordinates in the combined LAGEOS + GNSS solutions are dominated by the LAGEOS data. Some noncore SLR stations provide by far more observations to GNSS than to LAGEOS, e.g., Russian and Chinese stations dedicated to supporting GLONASS and BeiDou constellations. The number of solutions for these stations can be increased by up to 40%, whereas the station coordinate repeatability can be improved from about 20-30 mm to the level of 15-20 mm when considering both SLR to LAGEOS and SLR to GNSS. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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

Cited by 21 publications

References 29 publications

Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites

Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites

Impact of network constraining on the terrestrial reference frame realization based on SLR observations to LAGEOS

Estimating global geodetic parameters using SLR observations to Galileo, GLONASS, BeiDou, GPS, and QZSS

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