daniel at openmoko.org
Sun Mar 8 20:46:57 CET 2009
On Wed, 4 Mar 2009 20:33:15 +0100
Leonti Bielski <prishelec at gmail.com> wrote:
> In agps package for u-blox you have to provide approximate location of
> your phone and radius (for example 150 kms).
> What does it change? If I provide some longitude and latitude and set
> some huge radius will it affect anything?
> Is it possible to eliminate it at all?
The GPS chip can only search for a limited number of SVs in parallel
(the new ublox5 chips comes with a one million correlators which more
or less allows it to search for all SVs in parallel) so in order to
know which SVs should be in view it needs:
1) Current time
2) approx. position of the GPS device
3) Almanac (coarse orbit information) of the SVs
> My brother has N95 with Agps and he does not have to provide his
> location while using agps service.
Cellhunter http://wiki.openmoko.org/wiki/CellHunter tries to collect
GSM cell locations by making a game of it. After we have sufficient
coverage it will be possible to use that for initial position or even
for an approximate location in areas where GPS doesn't work.
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