thoughts on A-GPS offline

mqy meng.qingyou at
Sun Mar 1 21:57:30 CET 2009

U-blox receiver allows polling AID-EPH, AID-ALM data.
For each type, we can poll 32 messages for 32 satellites. 
The precondition is: current fix is valid -- at least 3 SVs has valid EPH(or
ALM?) data.

These data get invalid 2~4 hours later, 
can be stored into files, and load into GPS receiver when needed and they
are valid.

I've tried this, not sure whether it works or not, need more tests:)
AGPS-online works fine.

Raphaël Jacquot wrote:
> On Sun, Mar 01, 2009 at 08:31:16PM +0100, Daniel Willmann wrote:
>> Now that hot-/warmstart with ephemeris playback works with the framework
>> we should try to get an open server with aiding data available ASAP.
> is there a way to get the ephemeris data from the gps receiver at some
> point ?
> it could be stored on the phone and used as a calculation aide...
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