A new algorithm to reduce AGPS acquisition TTFF

Hanaa Al Bitar-El Natour 1 Michel Monnerat 2 Anne-Christine Escher 1 Christophe Macabiau 1 Marie-Laure Boucheret 3
1 ENAC - Ecole Nationale de l'Aviation Civile
2 ALCATEL ALENIA SPACE - Alcatel Alenia Space
3 ENSEEIHT - Ecole Nationale Supérieure d'Electrotechnique, d'Electronique, d'Informatique, d'Hydraulique et de Télécommunications
Abstract : The dramatic increase of Location Based Services and other location and navigation applications gives rise to a crucial need to improve positioning solutions. Currently, the American GPS is the only operational satellite based positioning system as the European Galileo system will be operational by 2010. This paper only deals with GPS receivers. The Time To First Fix (TTFF) and the sensitivity are the key drivers for their performance evaluation. The TTFF is the time needed for a GPS receiver to provide a first position. The sensitivity is the ability of a GPS receiver to acquire weak signals. For commercial solutions, an efficient receiver is one with reduced TTFF and high sensitivity. But generally, enhancing the sensitivity results in an increased TTFF and vice versa. In this paper, we propose a new algorithm for GPS acquisition which essentially deals with the TTFF.
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Hanaa Al Bitar-El Natour, Michel Monnerat, Anne-Christine Escher, Christophe Macabiau, Marie-Laure Boucheret. A new algorithm to reduce AGPS acquisition TTFF. ION NTM 2006, National Technical Meeting of The Institute of Navigation, Jan 2006, Monterey, United States. pp 301 - 311. ⟨hal-01021774⟩

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