Partial Correlation Technique for the Acquisition of Weak GPS/Galileo Signals

Fernando M. G. Sousa, Fernando D. Nunes, Jose M. N. Leitao

Abstract:	"Modernized civil GPS and the Galileo system utilize twochannel navigation signals: a data channel, carrying navigation data, and a dataless pilot channel. This work addresses the problem of cold acquisition of weak twochannel navigation signals in a software receiver. We propose an algorithm to compute partial correlations between the incoming signal and the locally-generated code which allows the simultaneous search of all primary code phases in a Doppler bin. Using circular correlation this technique is also able to deal with the secondary code transitions. Since the algorithm is based on FFTs it is very efficient from the computational point of view. Different approaches, with and without channels combination, and with coherent and non-coherent combination of primary code integrations, are analyzed, simulated and compared with alternative solutions."
Published in:	Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005) June 27 - 29, 2005 Royal Sonesta Hotel Cambridge, MA
Pages:	543 - 552
Cite this article:	Sousa, Fernando M. G., Nunes, Fernando D., Leitao, Jose M. N., "Partial Correlation Technique for the Acquisition of Weak GPS/Galileo Signals," Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005), Cambridge, MA, June 2005, pp. 543-552.
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