Systematic Error Mitigation in DORIS‐Derived Geocenter Motion

Couhert, Alexandre; Mercier, F.; Moyard, John; Biancale, R.

doi:10.1029/2018jb015453

Cited by 31 publications

(31 citation statements)

References 56 publications

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“…In the 5-, and 3-day solutions show worse results due to inhomogeneous distribution of stations. These results correspond to DORIS-based geocenter coordinates from Jason-2 satellite orbits, providing amplitudes of the annual signal of 1.5, 3.1, and 5.6 mm for the X, Y, and Z components, respectively [18].…”

Section: Discussionsupporting

confidence: 74%

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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: Discussionsupporting

confidence: 74%

“…Considering geocenter coordinates, Couhert et al [18] used DORIS-only and also SLR-only observations to Jason-2. For SLR-only solutions, estimation of 10-day geocenter was used with unconstrained adjustment of station height and range bias values, resulting in amplitudes of 1.5, 3.1 and 5.6 mm for the geocenter X, Y, Z components, respectively.…”

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confidence: 99%

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

et al. 2019

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“…A characteristic pattern with the amplitude of maximum up to 1.7 mm is visible in formal errors of the Z component of GCC in both SOL1 and SOL2. Although the SLR technique is most targeted for the GCC estimation, we cannot treat SLR‐based GCC as flawless (Couhert et al, ). We see the instability of formal errors (Figure ) and the possibility of the network effects in SLR‐based geocenter (cf.…”

Section: Resultsmentioning

confidence: 99%

Network Effects and Handling of the Geocenter Motion in Multi‐GNSS Processing

et al. 2019

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Both, the network configuration and the way of terrestrial reference frame (TRF) realization, affect the global geodetic products delivered from the Global Navigation Satellite Systems (GNSS) data processing. The purpose of this study is to analyze the differences in GNSS products, such as station coordinates, Earth rotation parameters, geocenter coordinates (GCC), and satellite orbits delivered from the double‐difference multi‐GNSS (GPS, GLONASS, and Galileo) processing, which may arise from (1) using a homogeneous and inhomogeneous network of multi‐GNSS stations, (2) different approaches to the TRF realization using minimum constraint conditions, and (3) different approaches to handling of GCC in GNSS global processing. The questionable quality of GCC delivered from the global GNSS solutions is described with a special attention to network effects and system‐specific parameters. We found that Galileo can provide GCC, whose quality corresponds to the GPS series. Moreover, the GCC from Galileo is of a better quality than those based on GLONASS data, despite the same number of nominal orbital planes and a much lower number of active satellites. When the No‐Net‐Translation constraint is not applied on the GNSS network, the station coordinate repeatability is worsened by about 70%, 55%, and 25% for the north, east, and up components, respectively, compared to the solution when applying No‐Net‐Translation and when having the network origin consistent with the international TRF. We thus infer that the No‐Net‐Translation condition is mandatory in global GNSS solutions.

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“…Thus, the discussed GCC is more likely addressed to the CoN rather than CoF, especially when an inhomogeneously distributed network of stations is employed in the solution. Couhert et al (2018) indicated almost a 5 mm shift along with the X component of the GCC between SLR and DORIS solutions. On the other hand, Zajdel et al (2019) found a network effect revealing a shift of 4 mm in the origin along the Y-axis between GNSS and SLR solutions.…”

Section: Impact On the Geocenter Coordinatesmentioning

confidence: 95%

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

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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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Systematic Error Mitigation in DORIS‐Derived Geocenter Motion

Cited by 31 publications

References 56 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

Network Effects and Handling of the Geocenter Motion in Multi‐GNSS Processing

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

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