gpsd and AGPS

Ian Stirling OpenMoko at
Mon Sep 3 13:56:49 CEST 2007

Luca Cabriolu wrote:
> Hi all,
> I am trying to understand how AGPS can work with gpsd daemon.
> In my undestanding, when I have an UMTS/GSM module and a GPS module 
> supporting AGPS, I can retrieve Assistance Data for AGPS from UMTS/GSM.
> I believe this can be done through an AGPS control software running on a 
> host processor.
> All this collected Data should be passed to GPS module through gpsd, I 
> believe.
> At this point I'd like to understand, if it is really possible to do it 
> through gpsd and in which way this can be done.
> Someone please help me to understand the way in which AGPS actually works.

AGPS is solely a marketing term.
It covers several different techniques.

Whatever the case - the current binary GPS solution does not support 
this sort of AGPS - at least according to its help info.

So, you need to find out how your phone provider broadcasts the 
assistance data, or how it accepts information from the phone to 
postprocess into a position, and then find out if the TI chipset in the 
phone is able to download/upload this data.

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