Assessment of degree-2 order-1 gravitational changes from GRACE and GRACE Follow-on, Earth rotation, satellite laser ranging, and models

AbstractThe Satellite Laser Ranging (SLR) technique has been used to determine Earth Rotation Parameters (ERP) for over twenty years. Most of results contributed to the International Earth Rotation Service (IERS) are based on analysis of observations of Lageos 1 & 2 satellites collected by the global tracking network of about 40 stations. Now five analysis centers submit operational (with 2–15 days delay) solutions and about ten analysis centers contribute yearly final (up to 23 years) ERP series. Some statistics related to SLR observations and analysis are presented and analyzed. Possible problems in SLR observations and analysis and ways of its solution are discussed.

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Low degree gravity changes from GRACE, Earth rotation, geophysical models, and satellite laser ranging

Journal of Geophysical Research Atmospheres ◽

10.1029/2007jb005397 ◽

2008 ◽

Vol 113 (B6) ◽

Cited By ~ 39

Author(s):

J. L. Chen ◽

C. R. Wilson

Keyword(s):

Earth Rotation ◽

Satellite Laser Ranging ◽

Laser Ranging ◽

Gravity Changes ◽

Low Degree

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Assessment of Degree-2 Zonal Gravitational Changes from GRACE, Earth Rotation, Climate Models, and Satellite Laser Ranging

Gravity, Geoid and Earth Observation - International Association of Geodesy Symposia ◽

10.1007/978-3-642-10634-7_88 ◽

2010 ◽

pp. 669-676 ◽

Cited By ~ 6

Author(s):

J. L. Chen ◽

C. R. Wilson

Keyword(s):

Earth Rotation ◽

Climate Models ◽

Satellite Laser Ranging ◽

Laser Ranging

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

Remote Sensing ◽

10.3390/rs11192282 ◽

2019 ◽

Vol 11 (19) ◽

pp. 2282 ◽

Cited By ~ 7

Author(s):

Dariusz Strugarek ◽

Krzysztof Sośnica ◽

Daniel Arnold ◽

Adrian Jäggi ◽

Radosław Zajdel ◽

...

Keyword(s):

Land Surface ◽

Earth Rotation ◽

Terrestrial Reference Frame ◽

Satellite Laser Ranging ◽

Laser Ranging ◽

Station Coordinates ◽

Geocenter Motion ◽

Earth Rotation Parameters ◽

Rotation Parameters

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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Tidal Parameters as a Tool for the Determination of the Coordinates of the SLR Stations

Artificial Satellites ◽

10.2478/arsa-2019-0010 ◽

2019 ◽

Vol 54 (4) ◽

pp. 129-135

Author(s):

Marcin Jagoda ◽

Miłosáawa Rutkowska ◽

Romuald Obuchovski ◽

Czesław Suchocki ◽

Jacek Katzer

Keyword(s):

Reference Frame ◽

Earth Rotation ◽

Reference System ◽

Satellite Geodesy ◽

Satellite Laser Ranging ◽

Laser Ranging ◽

System Service ◽

International Earth Rotation

Abstract One of the primary objectives of satellite geodesy is the determination of coordinates of the satellite laser ranging (SLR) stations. This task is conducted by using laser ranging techniques. The main goal of the current study was to assess the influence of using varied values of the tidal parameters (Love h2 and Shida l2 numbers) on the determination of the positions of chosen SLR stations. The obtained results are presented for coordinates determination conducted for six SLR stations: Mt Stromlo (no. 7825, Australia), Matera (no. 7941, Italy), Grasse (no. 7845, France), McDonald (no. 7080, USA), Arequipa (no. 7403, Peru) and Beijing (no. 7249, China). The analysis covers SLR data for 2 satellites (LAGEOS1 and LAGEOS2), which were observed for 10 consecutive years (from 2008 to 2018). The analysis was performed using the ITRF2014 reference frame in two scenarios of calculations. In scenario 1, the SLR stations coordinates were calculated using the nominal values as per the International Earth Rotation and Reference System Service (IERS) standards recommendation of the Love/Shida numbers: h2 = 0.6078, l2 = 0.0847. In scenario 2, the coordinates were estimated using the harnessing values of the Love/Shida numbers (h2 = 0.6140 and l2 = 0.0876), which were proposed by authors in a previous publication. The effect of the application of different values of the Love/Shida numbers for the determination of SLR stations coordinates was scrutinized.

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