A Novel Efficient Acquisition Scheme for a High Sensitivity Assisted GPS Receiver

Zhixing Liu, Chunming Fan, Shoichiro Asano, Nobuhiro Kishimoto, Harumasa Hojo, and Akio Yasuda

Abstract:	Automatic location identifications are required for emergency calls in Japan and many other countries. However, giving a reliable position promptly is a problem in places where the global positioning system (GPS) signal is extremely weak. We propose an acquisition scheme for assisted GPS (AGPS) architecture based on a timingsynchronized mobile network. System errors as well as code uncertainty range are discussed. With this method, the C/A code search range is significantly reduced, and long-time coherent correlation is possible. Simulations prove that the method is fast, efficient and power-saving for the user handset. Furthermore, the AGPS receiver can perform a short TTFF (Time To First Fix) start even with no ephemeris kept in the handset.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	1390 - 1395
Cite this article:	Liu, Zhixing, Fan, Chunming, Asano, Shoichiro, Kishimoto, Nobuhiro, Hojo, Harumasa, Yasuda, Akio, "A Novel Efficient Acquisition Scheme for a High Sensitivity Assisted GPS Receiver," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 1390-1395.
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