A-GPS (Assisted GPS) definition
GPS depends on information from satellites to get the current location of the device. But in case of an area where the device is getting poor signals, it may face trouble in locating the exact positioning data. In this case, the GPS unit may need as long as 12.5 minutes to get the exact current location. Hence, very slow startup performance of the GPS unit in case of poor satellite signals. Assisted GPS (abbreviated as a-GPS) is a system to improve the startup performance of GPS. It is used in GPS-capable devices to offer faster positioning systems.
It is achieved with the help of an Assistance Server. A data connection is required to use this. When GPS signals are weak, the device connects to an assistance server on the internet. A-GPS features depend mostly on internet data. In case of no internet connection, the device will use satellite data.
A-GPS also gives better accuracy.
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