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Precise Onboard Orbit Determination for LEO Satellites with Real-Time Orbit and Clock Corrections

Hauschild, Andre and Tegedor, Javier and Montenbruck, Oliver and Visser, Hans and Markgraf, Markus (2016) Precise Onboard Orbit Determination for LEO Satellites with Real-Time Orbit and Clock Corrections. In: Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS 2016), pp. 3715-3723. ION GNSS+ 2016, Portland, Oregon, USA.

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Official URL: https://www.ion.org/publications/abstract.cfm?articleID=14717

Abstract

Precise Point Positing (PPP) with real-time orbit and clock correction streams has become an established technique over the last decade for land, air and sea applications. The use of real-time corrections for precise positioning has not extended into orbit yet, although a number of low-Earth orbit (LEO) satellite missions have a demand for precise orbit determination (POD). Future satellites with altimeter and radio-occultation payloads may require real-time POD to enable onboard processing of science data for forecasting or nowcasting of meteorology data, open-loop instrument operations of radar payloads, or quick-look onboard science data generation. Also, precise real-time orbit information may be utilized for constellation maintenance of satellite formations. A POD accuracy of a few decimeters or better with precise GPS real-time corrections has repeatedly been demonstrated in the past. For these studies it was assumed that the corrections are continuously available. This is, however, not guaranteed to be the case in a realistic on-orbit scenario, in which the corrections are disseminated via a network of geostationary (GEO) satellites to the LEO satellite. The data link to the GEO constellation may not be available over the polar regions, thus outdated corrections must be used until up-to-date data is received again. These correction data gaps will have an adverse effect on the POD accuracy, especially since the satellite visibility is typically also reduced as well over the North and South pole. To assess the effect of outdated correction data on onboard POD, a Kalman-filter-based navigation algorithm has been used to process real-world GPS observations of a representative LEO satellite mission together with corrections based on real-time orbit and clock products from Fugro. Data gaps of different length have been simulated, during which the corrections must be extrapolated. The magnitude of orbit and clock extrapolation errors is assessed. Clock extrapolation errors are evaluated depending on the satellite block type and clock model. Real-time on-board POD results for the different scenarios are compared to a precise reference solution.

Item URL in elib:https://elib.dlr.de/111586/
Document Type:Conference or Workshop Item (Speech)
Title:Precise Onboard Orbit Determination for LEO Satellites with Real-Time Orbit and Clock Corrections
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hauschild, Andreandre.hauschild (at) dlr.dehttps://orcid.org/0000-0002-0172-3492
Tegedor, Javierj.tegedor (at) fugro.comUNSPECIFIED
Montenbruck, OliverOliver.Montenbruck (at) dlr.dehttps://orcid.org/0000-0003-4783-745X
Visser, HansHans.Visser (at) fugro.comUNSPECIFIED
Markgraf, Markusmarkus.markgraf (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS 2016)
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 3715-3723
Status:Published
Keywords:Onboard POD, GNSS, Real-Time Corrections
Event Title:ION GNSS+ 2016
Event Location:Portland, Oregon, USA
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Space Flight Technology
Deposited By: Hauschild, André
Deposited On:24 Apr 2017 11:04
Last Modified:24 Apr 2017 11:04

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