actually i believe it does help in much better accuracy (unless if you're indoors)
On Fri, Jun 6, 2008 at 3:11 AM, Lally Singh <[EMAIL PROTECTED]> wrote: > 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 >
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