An Efficient Acquisition Scheme for a High Sensitivity Assisted GPS Receiver
An Efficient Acquisition Scheme for a High Sensitivity Assisted GPS Receiver
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DOI：
10.1587/transcom.e92.b.1875
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Zhixing Liu;Chunming Fan;S. Asano;N. Kishimoto;H. Hojo;A. Yasuda
中科院分区：
文献类型：
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作者：
Zhixing Liu;Chunming Fan;S. Asano;N. Kishimoto;H. Hojo;A. Yasuda
在日本和许多其他国家，紧急呼叫需要自动位置识别。然而，在全球定位系统（GPS）信号极弱的地方，及时提供可靠的位置是一个问题。提出了一种基于定时同步移动的网络的辅助GPS（AGPS）捕获方案。讨论了系统误差、码不确定度范围和频率不确定度范围。利用这种方法，捕获搜索范围显著减小，并且使得长时间相干相关成为可能。仿真和实验证明，该方法是快速，高效和节能的用户手机。此外，AGPS接收机可以执行短的TTFF（首次定位时间）启动，即使手机中没有保持星历。
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.