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Q: Fachverband Quantenoptik und Photonik

Q 32: Precision Measurements and Metrology (Optical Clocks)

Q 32.1: Vortrag

Mittwoch, 11. März 2020, 14:00–14:15, a310

Prospects of frequency distribution networks to validate and reference satellite gravity prove Earth observation satellite missions — Stefan Schröder¹, •Simon Stellmer², and Jürgen Kusche¹ — ¹Institut für Geodäsie und Geoinformation, Universität Bonn, Nussallee 17, 53115 Bonn — ²Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn

Optical clocks have shown fractional instabilities in the range of 10⁻¹⁸ and continue to be improved in terms of precision and accurary, uptime, and transportability. Their "ticking rate" depends on the gravitational redshift, which opens the possibility to deploy such clocks for a measurement of the local gravitational potential. An ensemble of optical clocks could provide a geopotential reference system.

Here, we investigate the prospects of an optical time and frequency distribution network to provide a reference for satellite missions such as GRACE, GRACE-FO and Next-Generation Satellite Missions. The importance of such missions in the observation of mass transport related to climate change cannot be underestimated. New concepts to provide ground validation and referencing for these missions are highly desired.