On 30/10/2008 19:44, Matthias Camenzind wrote: > I thought right now near same like you. I thought about the speed of > satellites, > But also right now i had another idea. With the signal form two satellites, > and a > known high over sea it should be possible to locate you on north or south of > earth (only two possibilities). > This would be nice if you go on a mountain and you are standing in front of a > "signpost" (google translated) with meters over Sea value to get faster your > first fix.
You won't get a faster first fix because you concentrate on two satellites. The ublox receiver is able to track up to (AFAIR) 16 satellites at the same time. The *main* way to speedup the TTFF is to have almanac and optionally ephemeris available on the FR. Almanacs are valid for one week so it's easy to make sure you have up to date almanac before you go on a mountain :-) > A simple > question "Are you in the North of earth?" would be enough to get only one > possibility. Unless you did a long plane travel before switching on your FR, the last known position would be enough. Many satellites will be visible in Madrid and in Paris at the same time for example. Abdel. _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
