GPS <--> AGPS

[Flyin_bbb8]

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 <lally.singh at gmail.com> wrote:

> On Thu, Jun 5, 2008 at 7:25 PM, Joerg Reisenweber <joerg at openmoko.org>
> 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
>
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