tomas nackaerts <tomas.nackae...@gmail.com> writes: >> If the ephemiri data is fresh enough (2-4 hours max), the >> effect is the same as downloading the data from the internet. Other >> than that, there's no agps integration yet afaik. >> > > Don't know why, but i thought this data was useful for a couple of > days, not couple of hours
Almanac can be used for a couple of days, right, but almanac is not used for the real fix (though some receivers can provide a rough approximatation based on almanac), rather it's used to find to which sattelites it's worth listening to to get their ephemeri (every sattelite transfers its own ephemeri on its own channel). AFAIK modern receivers can listen on all the channels at the same time (they have enough correlators), so having almanac provides no advantage. In an ideal conditions you can get a fix in ~40 seconds without any data. U-blox has some "offline AGPS" trick allowing computation of ephemeris for the nearest feature, but i haven't heard about anyone had it working. At least that's what i think about GPS atm, i might be wrong in some details. -- Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! mailto:fercer...@gmail.com _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
