Modelling and prediction of GPS availability with digital photogrammetry and LiDAR

Authors:
George Taylor;Jing Li;David Kidner;Chris Brunsdon;Mark Ware
Affiliations:
GIS Research Centre, School of Computing, University of Glamorgan, CF37 1DL, Wales;GIS Research Centre, School of Computing, University of Glamorgan, CF37 1DL, Wales;GIS Research Centre, School of Computing, University of Glamorgan, CF37 1DL, Wales;Department of Geography, University of Leicester, Leicester LE1 7RU, England;GIS Research Centre, School of Computing, University of Glamorgan, CF37 1DL, Wales
Venue:
International Journal of Geographical Information Science
Year:
2007

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Abstract

This paper describes an automated method for predicting the number of satellites visible to a GPS receiver, at any point on the Earth's surface at any time. Intervisibility analysis between a GPS receiver and each potentially visible GPS satellite is performed using a number of different surface models and satellite orbit calculations. The developed software can work with various ephemeris data, and will compute satellite visibility in real time. Real-time satellite availability prediction is very useful for mobile applications such as in-car navigation systems, personal navigations systems and LBS. The implementation of the method is described and the results are reported.