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Most conventional GPS recievers have difficulty providing reliable positions in environments surrounded by tall buildings - the so-called 'urban canyon', as well as indoors and under heavy tree cover.
Also, when initially turned on, there can be a significant delay before the receiver can provide a position.
The A-GPS server can help in both these cases, as well as providing additional functionality.
It is able to do this as:
(approx, fixme!)
All these require an open-source GPS driver. Or at least a more flexible binary one.
Simply provide for rapid download of accurate orbital data, in a compressed format. | This is simple to implement, and provides modest gains in accuracy. |
Compute position for phone | Requires complex software to be written for the server |
Supply ionospheric model to phone | Relatively simple software on server, to echo internet sources of current ionospheric weather to the phone, opensource GPS driver on the phone. |
Peer-Peer ionospheric model | Use all stationary compatible phones with a view of the sky, and a free network connection to help derive an accurate ionospheric model. Also requires open-source GPS driver. |