Estimation of the Length of Day (LOD) from DORIS observations

Štěpánek, Petr; Hugentobler, Urs; Buday, Michal; Filler, Vratislav

doi:10.1016/j.asr.2018.04.038

Cited by 10 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, our results are slightly worse than those shown in [44], who obtained 0.25 mas level of standard deviation with respect to the IERS-08-C04 products, when based on DORIS observations to Envisat, SPOT4/5, Jason-2, Cryosat-2, HY-2A, SARAL satellites in the period 2008.5-2015.0. The obtained UT1-UTC statistics are better than those presented by [45] with the standard deviation of 0.12 ms with respect to IERS-14-C04, which were based on DORIS observations to active LEOs, such as Jason-2, Envisat, CryoSat, HY2A, SARAL, SPOT satellites in the period 2012-2015. Moreover, those studies are based on a larger set of data and a longer period of observations.…”

Section: Discussioncontrasting

confidence: 58%

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

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

Section: Discussioncontrasting

confidence: 58%

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

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In addition, typically a combination of GNSS [37] and Satellite Laser Ranging (SLR) observations in the LAser GEOdynamics Satellite (LAGEOS) and Etalon satellites are used to determine LOD [38]. In a limited scope, Doppler Orbitography and Radio-positioning Integrated by Satellite (DORIS) observations can be employed to derive LOD values as well [39]. Therefore, based on the LS + AR combination model, the above assessment shows that the new strategy further improves the performance of ultra-rapid UT1-UTC determination and the prediction performance of ultra-rapid LOD when using joint observation data.…”

Section: Methods 2 (B)mentioning

confidence: 99%

“…In addition, typically a combination of GNSS [37] and Satellite Laser Ranging (SLR) observations in the LAser GEOdynamics Satellite (LAGEOS) and Etalon satellites are used to determine LOD [38]. In a limited scope, Doppler Orbitography and Radio-positioning Integrated by Satellite (DORIS) observations can be employed to derive LOD values as well [39]. These observations will be used to enrich the strategy in the future.…”

Section: Methods 2 (B)mentioning

confidence: 99%

Improved Ultra-Rapid UT1-UTC Determination and Its Preliminary Impact on GNSS Satellite Ultra-Rapid Orbit Determination

Yuan

Deng

2020

Remote Sensing

View full text Add to dashboard Cite

Errors in ultra-rapid UT1-UTC primarily affect the overall rotation of spatial datum expressed by GNSS (Global Navigation Satellite System) satellite ultra-rapid orbit. In terms of existing errors of traditional strategy, e.g., piecewise linear functions, for ultra-rapid UT1-UTC determination, and the requirement to improve the accuracy and consistency of ultra-rapid UT1-UTC, the potential to improve the performance of ultra-rapid UT1-UTC determination based on an LS (Least Square) + AR (Autoregressive) combination model is explored. In this contribution, based on the LS+AR combination model and by making joint post-processing/rapid UT1-UTC observation data, we propose a new strategy for ultra-rapid UT1-UTC determination. The performance of the new strategy is subsequently evaluated using data provided by IGS (International GNSS Services), iGMAS (international GNSS Monitoring and Assessment System), and IERS (International Earth Rotation and Reference Systems Service). Compared to the traditional strategy, the numerical results over more than 1 month show that the new strategy improved ultra-rapid UT1-UTC determination by 29–43%. The new strategy can provide a reference for GNSS data processing to improve the performance of ultra-rapid products.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Estimation of the Length of Day (LOD) from DORIS observations

Cited by 10 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

Improved Ultra-Rapid UT1-UTC Determination and Its Preliminary Impact on GNSS Satellite Ultra-Rapid Orbit Determination

Preparing for Satellite Laser Uplinks and Downlinks

Contact Info

Product

Resources

About