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Telit 泰利特 Assisted GPS and Bundling positioning-timing-modules

Assisted GPS and Bundling

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Assisted GPS and Bundling
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positioning-timing-modules
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Telit 泰利特
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方向位置传感器交流圈

Even under the best circumstances, where initial position and time are known, the broadcast ephemeris download process can take up to 30 seconds, which in turn can mean a Time To First Fix (TTFF) of 30+ seconds. In typical real world environments, where the receiver does not have a clear view of the sky, TTFF can be even longer.

The goal of Assisted GPS (AGPS) feature is to provide the GNSS device with the Ephemeris data required to perform a faster time to navigation. The ephemeris data (often called Ephemeris Predictions, Extended Ephemeris or EE) are stored in a server and are downloaded through different means, such as a cellular internet connection. In this way, the GNSS device is able to provide a navigation fix in just a few seconds compared to cold/warm start conditions that could range from 30 seconds to several minutes, depending on the signal environment.