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Algorithms for On-Board Orbit Determination using GPS OBODE-GPS

Chiaradia, A.P.M. and Gill, E. and Montenbruck, O. and Kuga, H.K. and Prado, A.F.B.A. (2000) Algorithms for On-Board Orbit Determination using GPS OBODE-GPS. DLR-Interner Bericht. TN 00-04.

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Abstract

In the framework of GPS-based onboard orbit determination in real-time, a prototype implementation of an orbit determination software (OBODE-GPS) has been developed. The main goal of the OBODE-GPS aims to achieve an accuracy of 10 m along with minimum computational cost and usage of a taylored force model. For this sake, only the GPS code pseudo-range at the L1 frequency is applied, considering the effects of the clock offsets of the GPS and user satellites. The dynamic model considers a complex geopotential, while the state covariance matrix is propagated based on a simplified model. The Cowell`s method is used to propagate the orbit state vector; and a simple 4th order Runge-Kuta (RK 4) algorithm is used. Based on a conventional extended Kalman Filter, the spacecraft position and velocity state vectors as well as the user clock offset is extimated. To validate this model, real data from Topex/Poseidon satellite, which makes use of a dual frequency GPS receiver onboard, are apllied, and the results are compared with the Topex/Poseidon Precision Orbit Eqhemeris (POE) generated by NASA/JPL. In the analysis, emphasis is given to the determintion of an appropriate order of the gravity field and the step-size of the RK4 integrator. Furthermore, the consequences of including or excluding the J2 effects in the computation of the transition matrix are evaluated. Finally, the GPS broadcast ephemeris are comared with the GPS precise ephemeris.

Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=2000,
Title:Algorithms for On-Board Orbit Determination using GPS OBODE-GPS
Authors:
AuthorsInstitution or Email of Authors
Chiaradia, A.P.M.UNSPECIFIED
Gill, E.UNSPECIFIED
Montenbruck, O.UNSPECIFIED
Kuga, H.K.UNSPECIFIED
Prado, A.F.B.A.UNSPECIFIED
Date:2000
Status:Published
Keywords:GPS, Orbit Determination, Autonomous Navigation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Hauptabteilung Raumflugbetrieb und Astronautenausbildung
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 17:16

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