On Thu, Jun 5, 2008 at 7:25 PM, Joerg Reisenweber <[EMAIL PROTECTED]> wrote: > 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.
Ah, my mistake. I was hoping for more than just an almanac/ephem upload. I'm a lot less excited now. -- H. Lally Singh Ph.D. Candidate, Computer Science Virginia Tech _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community