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A Long-Term Broadcast Ephemeris Model for Extended Operation of GNSS Satellites

Montenbruck, Oliver and Steigenberger, Peter and Aicher, Moritz (2021) A Long-Term Broadcast Ephemeris Model for Extended Operation of GNSS Satellites. Navigation, Journal of the Institute of Navigation, 68 (1), pp. 199-215. Wiley. doi: 10.1002/navi.404. ISSN 0028-1522.

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Abstract

GNSS positioning relies on orbit and clock information, which is predicted on ground and transmitted by the individual satellites as part of their broadcast navigation message. The predictions are typically refreshed at least once per day and partitioned into short-arc ephemeris data sets covering a representative validity period of 0.5-4 h. For an increased autonomy of either the space or user segment, the capability to predict a GNSS satellite orbit over extended periods of up to two weeks is studied. A tailored force model for numerical orbit propagation is proposed that offers high accuracy but can still be used in real-time environments. Aside from Earth-orientation parameters, six state vector components and three empirical solar radiation pressure parameters are employed for each satellite and adjusted to past orbits. Using the Galileo constellation with its high-grade hydrogen maser clocks as an example, global average signal-in-space range errors of less than 25 m RMS and 3D position errors of less than about 50 m are demonstrated after two week predictions in 95% of all test cases over a half-year period. The autonomous orbit prediction model thus enables adequate quality for a rapid first fix or contingency navigation in case of lacking ground segment updates.

Item URL in elib:https://elib.dlr.de/139980/
Document Type:Article
Title:A Long-Term Broadcast Ephemeris Model for Extended Operation of GNSS Satellites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745X
Steigenberger, PeterDLR/GSOChttps://orcid.org/0000-0003-1905-6699
Aicher, MoritzMoritz.Aicher (at) dlr.deUNSPECIFIED
Date:2021
Journal or Publication Title:Navigation, Journal of the Institute of Navigation
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:68
DOI :10.1002/navi.404
Page Range:pp. 199-215
Publisher:Wiley
ISSN:0028-1522
Status:Published
Keywords:Orbit prediction, Broadcast ephemeris, Force model, GNSS, SISRE, Earth orientation parameters, Autonomy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Space Operations and Astronaut Training > Space Flight Technology
Deposited By: Montenbruck, Dr.rer.nat.hab. Oliver
Deposited On:04 Jan 2021 09:16
Last Modified:10 Mar 2021 09:09

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