DLR - Institut für Kommunikation und Navigation - Aktuelle Projekte A

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Aktuelle Projekte A - D

ADVANTAGE - Advanced Technologies for Navigation and Geodesy

The introduction of optical frequency references, atom interferometry, as well as of optical ranging and communications, creates new opportunities for systems based on time and frequency dissemination. The project investigates innovative architectures for a future satellite system that fully exploits the benefits of each of the aforementioned technologies. The architecture shall be based on a satellite constellation, named Kepler, divided into two segments: twenty-four Medium-Earth-Orbit (MEO) satellites and at least four Low-Earth-Orbits (LEO) satellites. MEO satellites shall be equipped with laser-stabilized cavities, characterized by Allan deviations down to 1e-14 and beyond for short integration time intervals, whereas LEO satellites shall be equipped with stable optical references (e.g. Iodine-based optical clocks). Optical terminals placed on each satellite will allow inter-satellite links (ILS), enabling tight intra- and inter-plane synchronization across the whole constellation, and providing absolute (sub-mm) inter-satellite ranging.

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ALPS - Alternative Positioning System

Global navigation satellite systems (GNSS) have been identified as primary means of navigation for aeronautics in the future and enable efficient procedures. But GNSS is vulnerable to radio frequency interference and space weather. The project Alternative Positioning System (ALPS) develops an alternative positioning navigation and timing system, composed of different terrestrial systems and on board sensors to function as a backup in case of a GNSS outage.

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