Reference system origin and scale realization within the future GNSS constellation “Kepler”

Glaser, Susanne; Michalak, Grzegorz; Männel, Benjamin; König, Rolf; Neumayer, Karl Hans; Schuh, Harald

doi:10.1007/s00190-020-01441-0

Cited by 25 publications

(10 citation statements)

References 44 publications

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“…Besides ground and onboard L-band data, BDS also provide ISL measurements, which has potential for geodetic estimation. The simulation performed by Glaser et al (2020) assess the potential improvements of the Kepler constellation on the TRF origin and scale. The results demonstrate that the fully developed Kepler system significantly improves the geocenter estimates, as it increases the reliability due to a complete de-correlation of the geocenter coordinates and the orbit parameters related to the SRP modeling.…”

Section: Contributions To Geodetic Parameters Estimationmentioning

confidence: 99%

Precise orbit determination for BDS satellites

et al. 2022

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Since the first pair of BeiDou satellites was deployed in 2000, China has made continuous efforts to establish its own independent BeiDou Navigation Satellite System (BDS) to provide the regional radio determination satellite service as well as regional and global radio navigation satellite services, which rely on the high quality of orbit and clock products. This article summarizes the achievements in the precise orbit determination (POD) of BDS satellites in the past decade with the focus on observation and orbit dynamic models. First, the disclosed metadata of BDS satellites is presented and the contribution to BDS POD is addressed. The complete optical properties of the satellite bus as well as solar panels are derived based on the absorbed parameters as well the material properties. Secondly, the status and tracking capabilities of the L-band data from accessible ground networks are presented, while some low earth orbiter satellites with onboard BDS tracking capability are listed. The topological structure and measurement scheme of BDS Inter-Satellite-Link (ISL) data are described. After highlighting the progress on observation models as well as orbit perturbations for BDS, e.g., phase center corrections, satellite attitude, and solar radiation pressure, different POD strategies used for BDS are summarized. In addition, the urgent requirement for error modeling of the ISL data is emphasized based on the analysis of the observation noises, and the incompatible characteristics of orbit and clock derived with L-band and ISL data are illuminated and discussed. The further researches on the improvement of phase center calibration and orbit dynamic models, the refinement of ISL observation models, and the potential contribution of BDS to the estimation of geodetic parameters based on L-band or ISL data are identified. With this, it is promising that BDS can achieve better performance and provides vital contributions to the geodesy and navigation.

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Section: Contributions To Geodetic Parameters Estimationmentioning

confidence: 99%

Precise orbit determination for BDS satellites

et al. 2022

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“…Nevertheless, further experimental evidence gradually approaching the long-term ground-to-satellite goal is required. Synergies can be expected with the proposed combination of microwave and optical links in the context of new GNSS constellations [136].…”

Section: Free Space-time and Frequency Linksmentioning

confidence: 99%

“…Bidirectional ground-to-satellite optical links are a necessity for many applications, such as the proposed Kepler constellation [136]. Additionally, they could play a part in comparisons of optical frequency references operating in different gravitational potentials, i.e., on the ground and in space.…”

Section: Optical Linksmentioning

confidence: 99%

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

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We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible roadmap for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies. research areas. As anticipated for a Europe-based event, about 80% of the registrations are from European countries, as seen in the lower right panel of Fig. 1, but there is also significant North American and Asian participation.This community provides the backbone for long-term planning and the support needed to see the challenging cold atom missions foreseen in the road-map through to their successful completions. The participants display an excellent and diverse mix of expertise, building an outstanding basis for the success of the workshop and the development of the corresponding road-map, which defines possible interim and long-term scientific goals and outlines technological milestones. Section 2 is an introduction to our document, Sections 3 to 5 discuss our main science themes, namely atomic clocks, Earth Observation and fundamental physics, Section 6 discusses the technology developments required before quantum sensors can be deployed in space, Section 7 summarises the discussions during the Workshop, and in Section 8 we outline the corresponding Community road-map.

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“…through rapid development of multi-GNSS analyses. Under scenario 3, we assume that errors can be -as for the clock rate uncertaintiesfurther reduced to a level of 0.3 mm, which would likely require next-generation GNSS systems (Giorgi et al, 2019;Glaser et al, 2020). The assumed reduction of uncertainty between the scenarios is larger for the clocks than for GNSS, which is probably realistic considering the evolution in clock techniques over the last decades (Poli et al, 2013), while GNSS for height control will be always limited by errors in tropospheric and ionospheric modelling.…”

Section: Clock Network Noisementioning

confidence: 99%

Potential and scientific requirements of optical clock networks for validating satellite gravity missions

Schröder¹,

Stellmer²,

Kusche³

2021

Preprint

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The GRACE mission, now continued as the GRACE-FO mission, has provided an unprecedented quantification of large-scale changes in the water cycle. Meanwhile, stationary optical clocks show fractional instabilities below 10-18 when averaged over an hour, and continue to be improved in terms of precision and accuracy, uptime, and transportability. The frequency of a clock is affected by the gravitational redshift, and thus depends on the local geopotential; a relative frequency change of 10-18 corresponds to a geoid height change of about 1 cm. This effect could be exploited for sensing temporal geopotential changes via a network of clocks distributed at the Earth's surface.&#160; Here, we concentrate on how the measurements of an ensemble of optical clocks connected accross Europe via optical fibre links could be used to validate and complement gravity field solutions from GRACE-FO and potential future gravity missions. Through simulations it is shown how hydrology (water storage) and atmosphere (dry and wet air mass) variations over Europe could be observed with clock comparisons in a future network. We assume different scenarios for clock and GNSS uncertainties, where we deem the latter to be nessecary to separate local height changes from the mass redistribution signals. Our findings suggest that even under conservative assumptions -- a clock error of 10-18 and vertical height control error of 1.4 mm for daily measurements -- hydrological signals at the annual time scale and atmospheric signals down to the weekly time scale could be observed. However, the requirements to an optical clock network used for validation of GRACE-FO and future gravity missions are higher than that, which is demonstrated along with the according spatial resolutions.

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Reference system origin and scale realization within the future GNSS constellation “Kepler”

Cited by 25 publications

References 44 publications

Precise orbit determination for BDS satellites

Precise orbit determination for BDS satellites

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Potential and scientific requirements of optical clock networks for validating satellite gravity missions

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