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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