GPS <--> AGPS

[Joerg Reisenweber]

Am Do  5. Juni 2008 schrieb Lally Singh:
> AFAIK, the AGPS allows you to upload additional information into the
> onboard correlator (the CPU that does the actual location calculations
> for GPS) to enhance the accuracy over what you get with simple
> satellite triangulation.

It's about reducing TTFF, not increasing accuracy [1]. Basically you tell the 
receiver which sats it should expect, so it doesn't have to check all 
possible "channels" and "download" the data from sat (AFAIK). See ephem and 
alm in uBlox paper.

[1] Increasing accuracy is differential-GPS, where you have a reference 
receiver at known position, so you can tell pos of 2nd relative to ref in 
sub-meter accuracy.

Also see: http://wiki.openmoko.org/wiki/Hardware:AGPS which I found just after 
typing the above.

/j
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