An Efficient Acquisition Scheme for a High Sensitivity Assisted GPS Receiver
| Autor: | Akio Yasuda, Chunming Fan, Zhixing Liu, Shoichiro Asano, Nobuhiro Kishimoto, Harumasa Hojo |
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| Rok vydání: | 2009 |
| Předmět: |
Precision Lightweight GPS Receiver
Computer Networks and Communications Computer science business.industry Real-time computing Ephemeris Handset law.invention Identification (information) Time to first fix law Embedded system Assisted GPS Cellular network Global Positioning System Satellite navigation Electrical and Electronic Engineering business Software |
| Zdroj: | IEICE Transactions on Communications. :1875-1883 |
| ISSN: | 1745-1345 0916-8516 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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