An Efficient Acquisition Scheme for a High Sensitivity Assisted GPS Receiver

Automatic location identification is required for emergency calls in Japan and many other countries. However, promptly providing a reliable position is a problem in places where the global positioning system (GPS) signal is extremely weak. We propose an acquisition scheme for the assisted GPS (AGPS)...

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Veröffentlicht in:IEICE Transactions on Communications 2009/05/01, Vol.E92.B(5), pp.1875-1883
Hauptverfasser: LIU, Zhixing, FAN, Chunming, ASANO, Shoichiro, KISHIMOTO, Nobuhiro, HOJO, Harumasa, YASUDA, Akio
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Sprache:eng
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Zusammenfassung:Automatic location identification is required for emergency calls in Japan and many other countries. However, promptly providing a reliable position is a problem in places where the global positioning system (GPS) signal is extremely weak. We propose an acquisition scheme for the assisted GPS (AGPS) architecture based on a timing-synchronized mobile network. System errors as well as code uncertainty range and frequency uncertainty range are discussed. With this method, the acquisition search range is significantly reduced, and a long-time coherent correlation is made possible. Simulations and experiments 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.
ISSN:0916-8516
1745-1345
DOI:10.1587/transcom.E92.B.1875