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

Sośnica, Krzysztof; Bury, Grzegorz; Zajdel, Radosław; Strugarek, Dariusz; Drożdżewski, Mateusz; Kaźmierski, Kamil

doi:10.1186/s40623-019-1000-3

Cited by 30 publications

(16 citation statements)

References 45 publications

(46 reference statements)

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“…In the next step, solutions with different numbers of 1-day normal equations: 1-, 3-, 5-, 7-and 15-day solutions, were tested for the estimation of station and geocenter coordinates, pole coordinates and UT1-UTC. In all tested solutions we stacked 1-day normal equations, where ERPs were always estimated with a 1-day resolution, parameterized as piece-wise linear [33]. Other parameters, such as station and geocenter coordinates were estimated as one set per one solution, for example, one set of coordinates for 7 days in the solution.…”

Section: Methodsmentioning

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: Methodsmentioning

confidence: 99%

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

et al. 2019

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“…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." [9] To aid fiducial reference systems [65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82], the rotation of the Earth, and basic physics such as modeling the gravity field, planning for geodetic satellites with retro-reflectors and high mass-to-area ratios was underway by the early 1970s. .…”

Section: Satellite Laser Range Findingmentioning

confidence: 99%

Preparing for Satellite Laser Uplinks and Downlinks

Dmytryszyn¹,

Crook²,

Sands³

2020

Sci

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The use of Light Amplification by Stimulated Emission of Radiation (i.e., LASERs or lasers) by the U.S. Department of Defense is not new and includes laser weapons guidance, laser-aided measurements, even lasers as weapons (e.g., Airborne Laser). Lasers in support of telecommunications is also not new. The use of laser light in fiber optics shattered thoughts on communications bandwidth and throughput. Even the use of lasers in space is no longer new. Lasers are being used for satellite-to-satellite crosslinking. Laser communication can transmit orders-of-magnitude more data using orders-of-magnitude less power and can do so with minimal risk of exposure to the sending and receiving terminals. What is new is using lasers as the uplink and downlink between the terrestrial segment and the space segment of satellite systems. More so, the use of lasers to transmit and receive data between moving terrestrial segments (e.g., ships at sea, airplanes in flight) and geosynchronous satellites is burgeoning. This manuscript examines the technological maturation of employing lasers as the signal carrier for satellite communications linking terrestrial and space systems. The purpose of the manuscript is to develop key performance parameters (KPPs) to inform U.S. Department of Defense initial capabilities documents (ICDs) for near-future satellite acquisition and development. By appreciating the history and technological challenges of employing lasers rather than traditional radio frequency sources for satellite uplink and downlink signal carriers, this manuscript recommends ways for the U.S. Department of Defense to employ lasers to transmit and receive high bandwidth, large-throughput data from moving platforms that need to retain low probabilities of detection, intercept, and exploitation (e.g., carrier battle group transiting to a hostile area of operations, unmanned aerial vehicle collecting over adversary areas). The manuscript also intends to identify commercial sector early-adopter fields and those fields likely to adapt to laser employment for transmission and receipt.

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“…The vast majority of them were accepted for the datum realization in 80-90% of their occurrences when the threshold of 25 mm was applied. Observations delivered by Changchun (7237) are biased because of inferior a priori station coordinates and several device issues at the station (Zajdel et al 2017;Sośnica et al 2019). Thus, it is regularly rejected and its positive impact on the TRF datum realization is questionable despite high productivity.…”

Section: Station Suitability For the Trf Datum Realizationmentioning

confidence: 99%

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

Cited by 30 publications

References 45 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

Preparing for Satellite Laser Uplinks and Downlinks

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

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