Re: [QtMoko] adding agps support
tomas nackaerts 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
Re: [QtMoko] adding agps support
> When it's said FSO has agps enabled by default they mean FSO stores > ephemeris and almanac from the chip every time prior to powering it > off and loads the saved data after powering on. The code is there in > ogpsd. Thanks for the info, i will have a look at the source. > 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 thx, toams ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [QtMoko] adding agps support
Radek Polak writes: >> SHR, and probably others too, have agps enabled by default. So i think it >> should be fairly easy to add this. I did a little research and it seems >> like all we have to do is to save the latest GPS data to a file when the >> GPS is shut down and feed this data back to the GPS when starting GPS next >> time. > > I have been searching the wiki, but havent found anything usefull on this. I > found just how to do AGPS using ublox online service. When it's said FSO has agps enabled by default they mean FSO stores ephemeris and almanac from the chip every time prior to powering it off and loads the saved data after powering on. The code is there in ogpsd. 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. HTH -- 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
Re: [QtMoko] adding agps support
On Thursday 20 May 2010 19:44:27 Tomas Nackaerts wrote: > SHR, and probably others too, have agps enabled by default. So i think it > should be fairly easy to add this. I did a little research and it seems > like all we have to do is to save the latest GPS data to a file when the > GPS is shut down and feed this data back to the GPS when starting GPS next > time. I have been searching the wiki, but havent found anything usefull on this. I found just how to do AGPS using ublox online service. Can anyone point me how to do offline AGPS? Regards Radek ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [QtMoko] adding agps support
On Thu, May 20, 2010 at 8:44 PM, Tomas Nackaerts wrote: > Hello, > > SHR, and probably others too, have agps enabled by default. So i think it > should be fairly easy to add this. I did a little research and it seems like > all we have to do is to save the latest GPS data to a file when the GPS is > shut > down and feed this data back to the GPS when starting GPS next time. > > after a little more research i found: > "/opt/qtmoko/bin/gps-poweron.sh" and > "/opt/qtmoko/bin/gps-poweroff.sh" > maybe we can adjust these files? or add agps support at > ~/qtmoko/devices/neo/src/plugins/whereabouts/neo/neogpsplugin.cpp > > unfortunately my hacking skills are not good enough for doing this myself. > > I hope somebody can implement this, or at least provide me some more > information so i can try to implement this myself. This sounds interesting & would be great to have. I think gps-poweron.sh and off.sh are not used any more but 'omtools' or 'omhacks' or whatever that basically lets you do magic with om gps on or something like that.. Someone will very likely correct me soon :) That's all I can say. You can also join #qtmoko IRC channel to discuss real-time r -- | risto h. kurppa | risto at kurppa dot fi | http://risto.kurppa.fi ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
