[FSO] Speed gps time to firxt fix up?

lollisoft lothar.behrens at lollisoft.de
Sat Jan 3 14:06:22 CET 2009


what did you made to get GPS working in general ?

See my post about GPS ...



Fox Mulder wrote:
> Since a few weeks i'm using fso-gpsd without any big problems so far.
> The only problem is that the TTFF (time to first fix) is always >1
> minute and sometimes it needs quite a lot of time. The only solution for
> me to be sure to get a fix within <30 sec is to use the agps tool which
> downloads the almanac and ephemeris from ublox for my region.
> The problem is, that the gps chip doesn't have any internal memory why
> it needs to download all relevant gps data every time it is powered up.
> So i thought if it is possible to save the relevant gps data before
> shutting down the gps which can be done by fso-gpsd or kernel
> automatically. Than after starting the gps fso-gpsd/kernel feeds back
> the data to speed up the TTFF. This would be the same way most gps
> receivers work.
> Maybe this is already implemented somewhere but i don't think so because
> the TTFF without agps is always quite slow.
> Ciao,
>      Rainer
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