On Wed, 4 Mar 2009 20:33:15 +0100 Leonti Bielski <prishe...@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. Regards, Daniel Willmann
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