gpsd and AGPS

[Ian Stirling]

Tilman Baumann wrote:
> Torfinn Ingolfsen wrote:
> 
>> Hello,
>>
>> On 9/3/07, Ian Stirling <OpenMoko at mauve.plus.com> wrote:
>>
>>> http://en.wikipedia.org/wiki/A-GPS
>>> http://wiki.openmoko.org/wiki/Server:A-GPS
>>
>>
>> I just keep wondering how hard it would be for us opensource prople to
>> set up a network of assistance servers?
>> Would a PC with an usb GPS device (and suitable os and software of
>> course) be able to function as an assistance server?
> 
> 
> The A-GPS data aren't so dynamic as it sounds. I guess this could easyly 
> be done with ipgk updates.
> Satellites may drift, but not so rapidly that something unexpected 
> happens in days.
> I think...

Satellite drift isn't the interesting problem.
That can indeed be predicted quite well with more precise orbits.
The interesting part is ionospheric weather.
This varies on a few-minute timescale.

This is what http://wiki.openmoko.org/wiki/Server:A-GPS could answer.