.......................................................................................................................................... ii Acknowledgements ........................................................................................................................ iv Table of

ii Acknowledgements v List of Tables x List of Figures xi List of Acronyms xvii

Improved operational autonomy is required for the operation of any single satellite within a LEO satellite network. One onboard function, which is an interesting candidate to be implemented with an increased level of onboard autonomy is apparently the navigation function, which is in charge of the determination of the instantaneous satellite orbital position and attitude. This paper aims to dem...

Theperformanceoftheglobalnavigationsatellitesystem(GNSS)canbeenhancedsignificantly by introducing the inter-satellite links (ISL) of a navigation constellation. In particular, the improvement of the position, velocity, and time accuracy, and the realization of autonomous functions require the ISL distance measurement data as the original input. For building a high-performance ISL, the ranging co...

ii Abstract (in Finnish) iiiin Finnish) iii

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1 This research work has been funded by the European Commission through IST Project EMILY IST-2000-26040 and the Spanish Government through CICYT project TIC2000-1041-C03-01. Abstract This paper shows the need to transmit extra assistance data in hybrid location systems. The proposal presented here uses the current network protocols in order to deliver these non-standardized assistance data in ...