Andrew Daviel schrieb: > On Tue, 24 Jun 2008, GROG! (Jeff Howie) wrote: >> On Tue, Jun 24, 2008 at 1:26 PM, Joshua Layne <joshua@xxxxxxxxxxxxx> wrote: >> So assuming that AGPS _is_ included, would that be usable by an N800 >> with a bluetooth GPS? > > I have to agree with Josh. > > AFAIK, the AGPS interface to the GPS chip in the N810 is a serial link > using a proprietary TI protocol. AGPS is intended for use in cellphones > so it's unlikely to be implemented in a standalone device. Well... AGPS (assisted GPS) is intended to shorten the time to first fix (TTF) by uploading known data like ephimeris data up into the GPS receiver. The "known data" can also be a precise known time, geographic region etc. Bascially all data that can be used to help "guessing" your initial position or help the corelation. Some cellular networks broadcast position alike information as part of the cellular infrastructure which can be used to helpthe GPS receiver. But this is not the only method. There are also IP network based services by some companies providing initial data, like ublox or Jentro. Using the ephimeris data from ublox a ublox Antaris 5 receiver can have a time to first after cold start of less than three seconds! SIRF-III also supports AGPS (upload of ephimeris) in some configurations. The "problem" with AGPS is that it does not help much in the offline state. If you do not get up-to-date information from the network you are back to the non AGPS time to first fix. Ephimeris data is valid IIRC 28h so you have to update it every day. > Hmm, just installed Diablo. No network traffic when starting wayfinder > map - I thought the AGPS patch was going to look for an ephemeris online. > > Hmm... as per > http://www.internettablettalk.com/forums/showpost.php?p=186839&postcount=641 > there's an app agps-ui beta from > http://catalogue.tableteer.nokia.com/certified/pool/diablo/user/a/agps-ui/ > It uses supl-daemon to download something from > https://supl.nokia.com:7275 > > Not sure at this point what effect this has - I'm indoors with too weak > a satellite signal to get a fix. Looks interesting ... certainly agps-ui > lets you choose your estimated position. We already wondered what this GUI is good for ;) Choosing your region? Oh well... Cheers nils faerber -- kernel concepts GbR Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 Fax: +49-271-771091-19 D-57072 Siegen Mob: +49-176-21024535 -- _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
