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Kepler - Satellite Navigation without Clocks and Ground Infrastructure

Günther, Christoph (2018) Kepler - Satellite Navigation without Clocks and Ground Infrastructure. In: Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), pp. 849-856. ION GNSS+ 2018, 24.-28. Sep. 2018, Miami, USA. DOI: 10.33012/2018.15997 ISBN 0-936406-10-0 ISSN 2331-5954

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Official URL: https://www.ion.org/publications/abstract.cfm?articleID=15997


Global Navigation Satellite Systems receivers use pseudorange measurements for positioning and time determination. The control system uses the same measurements for estimating the satellite orbits, clock offsets and signal biases in a complex estimation process, which additionally involves the determination of atmospheric delays. In current systems, the separation of these different parameters imposes strong requirements on the stability of the satellite clocks and on the ground infrastructure. Several hundred ground monitoring stations are additionally used in high accuracy applications. The Kepler proposal follows a different approach. It re-uses the Galileo constellation of Medium Earth Orbiting (MEO) satellites, as well as its signals but complements them by a small constellation of Low Earth Orbiting (LEO) satellites and by selected optical Inter-Satellite Links (ISL). The LEO satellites are used to observe the signals transmitted by the MEO satellites from outside the atmosphere. The optical ISL connect all satellites in a multi-hop fashion. This enables a direct synchronization of the satellites at a level not achievable today and additionally does not require that the MEO satellites are equipped with clocks. The optical ISL furthermore provide ranges rather than pseudoranges for orbit determination as well as a broadband intra-system communication network. Terrestrial infrastructures become mostly obsolete with the Kepler approach. A single monitoring and control station remains necessary to maintain the alignment with earth-rotation, the synchronization to Universal Time Coordinate (UTC), and the capability of controlling the system.

Item URL in elib:https://elib.dlr.de/126622/
Document Type:Conference or Workshop Item (Speech)
Title:Kepler - Satellite Navigation without Clocks and Ground Infrastructure
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Günther, ChristophChristoph.Guenther (at) dlr.deUNSPECIFIED
Date:September 2018
Journal or Publication Title:Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.33012/2018.15997
Page Range:pp. 849-856
Keywords:Kepler Galileo Satellite Navigation Clocks Ground Infrastructure
Event Title:ION GNSS+ 2018
Event Location:Miami, USA
Event Type:international Conference
Event Dates:24.-28. Sep. 2018
Organizer:ION Institute of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Project Navigation 4.0
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Deposited By: Haas, Susanne
Deposited On:22 Feb 2019 11:53
Last Modified:01 Nov 2019 03:00

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