Orbital Navigation with a GPS Receiver on the H.E.T.E Spacecraft

J. Luc Issler, Roselyne Mesnard, Magali Tello, Eric Peragin, Francois Martel, George Ricker, Albert Auphan, Gerard Caillet, Christian Mehlen, and Christian Valpard

Abstract:	The CNES (Centre National d’Etudes Spatiales) will provide a GPS receiver developped by SEXTANT Avionique to the MIT (Massachussets Institute of Technology) for the HETE (High Energy transient Experiment) spacecraft. HETE IS a NASA program managed by MIT. The spacecraft and the ground segment are manufactured by AeroAslro Inc. HETE is a minisatellite dedicated to the observation of gamma bursts and transient sources in X-ray and Ultra Violet. A Pegasus launch is planned in April 1995, toward a circular low orbit. The GPS is needed by MIT for an accurate datation of the observed gamma bursts in U.T.C time, and as a backup radiolocalization equipment. The GPS/HETE receiver can be considered as a first step of CNES in GPS autonomous orbitography, to study the performances of two on-board navigators. The GPS receiver performance will be tested m orbit under Selective Availibility conditions, by using only LI -C/A codes, in order to be completely independant of AntiSpoofing. The GPS/HETE receiver provides 8 active channels and IS designed for autonomous operations in orbit with a smgle GPS antenna. The HETE orbital elements and a U.T.C Pulse per Second are provldcd in real-time by the on board navigator. The system analysis conducted by CNES and SEXTANT Avlonique is prcscntsd in the paper : - Dynamic Doppler and link budget. - Unaided Time To First Fix Estirnatlonh. - GPS orbital navigator principles. Some test results with a GPS simulator (Northern Telecom) with provides orbital scenarii are also presented.
Published in:	Proceedings of the 1994 National Technical Meeting of The Institute of Navigation January 24 - 26, 1994 Catamaran Resort Hotel San Diego, CA
Pages:	645 - 656
Cite this article:	Issler, J. Luc, Mesnard, Roselyne, Tello, Magali, Peragin, Eric, Martel, Francois, Ricker, George, Auphan, Albert, Caillet, Gerard, Mehlen, Christian, Valpard, Christian, "Orbital Navigation with a GPS Receiver on the H.E.T.E Spacecraft," Proceedings of the 1994 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1994, pp. 645-656.
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