[1] https://github.com/gabrys/gta02-agps
:-) On 05/24/2011 02:42 PM, Ed Kapitein wrote: > On 05/23/2011 07:24 PM, Phil Vandry wrote: >> On Wed, May 18, 2011 at 03:19:16PM +0200, Eric Smith wrote: >>> Main application here is in a sea shipping container. >>> >>> The key issues are RF communication (when in a GSM range of course) >>> and power management due to the long haul journey including journey >>> overland. Power supply has to be in the form of an additional battery. >>> >>> Technical issue is to have minimal size OS and to be low in power >>> consumption. And robust. >> If you sleep and only wake up at intervals, you should anticipate some >> difficulty acquiring a GPS signal every time you wake up. The GPS in >> the Freerunner is really designed to make use of A-GPS and if you can't >> do it because you are at sea and far from any network signal, it can >> take a long time to get a position. We have sometimes seen it take over >> 40 minutes to get a good fix (unit mounted on an aircraft glareshield). >> >> -Phil >> >> _______________________________________________ >> Openmoko community mailing list >> community@lists.openmoko.org >> http://lists.openmoko.org/mailman/listinfo/community >> >> > You could overcome the TTFF problem by using the agps software from [1] > It loads the needed data from the gps chip and uses that the next time > you power on the gps unit. > I usually get a fix in 2 minutes. > If you send the log data to a server via GPRS, you might want to use > rsync with the --inplace option. > The logs will only grow i suspect and i use this method of transferring > the gps log from my car to my server at home, > while driving. > It also helps to chop the log files in smaller parts (+/- 2Mb per file) > in case the GPRS connection is not that reliable, a resend > will take less time. > Roaming data can be expensive, so you might want to look at that too, > with your mobile phone provider. > > Good luck with your project, and keep us posted about the > successes/failures, we would like to learn from it. > > Kind regards, > Ed > > > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community > > _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community