Temperature, radiation and aging analysis of the DORIS Ultra Stable Oscillator by means of the Time Transfer by Laser Link experiment on Jason-2

Belli, Alexandre; Exertier, P.; Samain, E.; Courde, Clément; Vernotte, F.; Jayles, C.; Auriol, A.

doi:10.1016/j.asr.2015.11.025

Cited by 21 publications

(5 citation statements)

References 26 publications

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“…In the blue solution, frequency drifts were also adjusted per pass for a set of selected DORIS sites located in the South Atlantic Anomaly (SAA) area: Arequipa, Peru; Ascension, United Kingdom (South Atlantic Ocean); Cachoeira‐Paulista, Brazil; St‐Helena, United Kingdom (South Atlantic Ocean); Kourou, France (French Guiana); Libreville, Gabon; and Sal, Cape Verde. Indeed, Willis et al () and Belli et al () observed in detail the sensitivity of the Jason‐2 DORIS oscillator to radiations when the satellite passes over the SAA. This supplementary parameterization is able to mitigate well the spurious frequency drifts of the Jason‐2 USO, manifesting as an offset in “SAA station” height estimates.…”

Section: Resultsmentioning

confidence: 99%

Systematic Error Mitigation in DORIS‐Derived Geocenter Motion

et al. 2018

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Geocenter motion observation is one of the most demanding applications of high‐precision geodetic techniques. Here a quantitative framework is derived that shows how dominant sources of correlations and modeling issues should be mitigated when estimating the geocenter coordinates. While obtaining independent Doppler Orbitography and Radiopositioning Integrated by Satellite‐based geocenter time series, this paper shows how DORIS data and the Ocean Surface Topography Mission (OSTM)/Jason‐2 satellite can contribute to allow insight into model and geodetic technique errors and provide an independent assessment of the ITRF2014 origin stability: In particular, about ∼5mm offset along the X axis and ∼2mm higher annual amplitude in the axial direction were estimated for the geocenter coordinates over the period 2008.5–2015.5. To first order, Yarkovsky‐Schach coupling mutes Satellite Laser Ranging (SLR) + Laser Geodynamics Satellite (LAGEOS) geocenter solutions, when station heights and biases are adjusted to mitigate their modeling errors.

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Section: Resultsmentioning

confidence: 99%

Systematic Error Mitigation in DORIS‐Derived Geocenter Motion

et al. 2018

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“…An A-LRR allows the precise determination of the onboard clock and the monitoring of its behavior in the space environment (gravity field, radiation, temperature) as a supplement to the POD provided by the conventional SLR. Such an idea has been demonstrated by SLR ground stations with the T2L2 instrument on board the Jason-2 satellite (Belli et al 2016). This project highlighted the wide disparity between laser stations in local time management.…”

Section: Passive and Active Laser Retro-reflectormentioning

confidence: 93%

“…A comparison of the onboard USO to ground atomic clocks could be achieved thanks to an A-LRR (see section Passive and active laser retro-reflector). For example, a model of the USO on board Jason-2 satellite was developed thanks to the Time Transfer by Laser Link (T2L2) instrument (Belli et al 2016).…”

Section: Improvement In Global Positioningmentioning

confidence: 99%

GENESIS: co-location of geodetic techniques in space

Delva

Altamimi

Blazquez

et al. 2023

Earth Planets Space

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Improving and homogenizing time and space reference systems on Earth and, more specifically, realizing the Terrestrial Reference Frame (TRF) with an accuracy of 1 mm and a long-term stability of 0.1 mm/year are relevant for many scientific and societal endeavors. The knowledge of the TRF is fundamental for Earth and navigation sciences. For instance, quantifying sea level change strongly depends on an accurate determination of the geocenter motion but also of the positions of continental and island reference stations, such as those located at tide gauges, as well as the ground stations of tracking networks. Also, numerous applications in geophysics require absolute millimeter precision from the reference frame, as for example monitoring tectonic motion or crustal deformation, contributing to a better understanding of natural hazards. The TRF accuracy to be achieved represents the consensus of various authorities, including the International Association of Geodesy (IAG), which has enunciated geodesy requirements for Earth sciences. Moreover, the United Nations Resolution 69/266 states that the full societal benefits in developing satellite missions for positioning and Remote Sensing of the Earth are realized only if they are referenced to a common global geodetic reference frame at the national, regional and global levels. Today we are still far from these ambitious accuracy and stability goals for the realization of the TRF. However, a combination and co-location of all four space geodetic techniques on one satellite platform can significantly contribute to achieving these goals. This is the purpose of the GENESIS mission, a component of the FutureNAV program of the European Space Agency. The GENESIS platform will be a dynamic space geodetic observatory carrying all the geodetic instruments referenced to one another through carefully calibrated space ties. The co-location of the techniques in space will solve the inconsistencies and biases between the different geodetic techniques in order to reach the TRF accuracy and stability goals endorsed by the various international authorities and the scientific community. The purpose of this paper is to review the state-of-the-art and explain the benefits of the GENESIS mission in Earth sciences, navigation sciences and metrology. This paper has been written and supported by a large community of scientists from many countries and working in several different fields of science, ranging from geophysics and geodesy to time and frequency metrology, navigation and positioning. As it is explained throughout this paper, there is a very high scientific consensus that the GENESIS mission would deliver exemplary science and societal benefits across a multidisciplinary range of Navigation and Earth sciences applications, constituting a global infrastructure that is internationally agreed to be strongly desirable. Graphical Abstract

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“…The level of noise, i.e. noise amplitudes, was greater for observations collected in the 1990s (group 1) than it was for the latest data (group 3) Belli et al 2016) may have on the increase in equatorial noise in the DORIS data (Fig. 7).…”

Section: Noise Analysismentioning

confidence: 99%

Stochastic models in the DORIS position time series: estimates for IDS contribution to ITRF2014

Kłos

Bogusz

Moreaux

2017

J Geod

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This paper focuses on the investigation of the deterministic and stochastic parts of the Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) weekly time series aligned to the newest release of ITRF2014. A set of 90 stations was divided into three groups depending on when the data were collected at an individual station. To reliably describe the DORIS time series, we employed a mathematical model that included the long-term nonlinear signal, linear trend, seasonal oscillations and a stochastic part, all being estimated with maximum likelihood estimation. We proved that the values of the parameters delivered for DORIS data are strictly correlated with the time span of the observations. The quality of the most recent data has significantly improved. Not only did the seasonal amplitudes decrease over the years, but also, and most importantly, the noise level and its type changed significantly. Among several tested models, the power-law process may be chosen as the preferred one for most of the DORIS data. Moreover, the preferred noise model has changed through the years from an autoregressive process to pure power-law noise with few stations characterised by a positive spectral index. For the latest observations, the medians of the velocity errors were equal to 0.3, 0.3 and 0.4 mm/year, respectively, for the North, East and Up components. In the best cases, a velocity uncertainty of DORIS sites of 0.1 mm/year is achievable when the appropriate coloured noise model is taken into consideration.

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Temperature, radiation and aging analysis of the DORIS Ultra Stable Oscillator by means of the Time Transfer by Laser Link experiment on Jason-2

Cited by 21 publications

References 26 publications

Systematic Error Mitigation in DORIS‐Derived Geocenter Motion

Systematic Error Mitigation in DORIS‐Derived Geocenter Motion

GENESIS: co-location of geodetic techniques in space

Stochastic models in the DORIS position time series: estimates for IDS contribution to ITRF2014

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