Hi Michael- > 2. Is this AssistNOW(TM) supported by the GTA02 software? Are there > better/cheaper ways of getting up to date "almanac" and "ephemeris" into the > freerunner? >
For GTA02 default shipment image, there is no A-GPS/GPS supported software inside. You could find the u-blox A-GPS online implementation document here: http://people.openmoko.org/matt_hsu/ImplementationAssistNowServerAndClient(GPS.G4-SW-05017-C).pdf And implementation code in following address. http://svn.openmoko.org/developers/matt_hsu/agps-online/ Here is a brief script to run this application: ============================================= #!/bin/sh echo 1 >/sys/bus/platform/drivers/neo1973-pm-gps/neo1973-pm-gps.0/pwron ./agps-onlinec -c full -u youraccount -k yourpasswd -la 25.073270 -lo 121.574805 -p 999999.00 cat /dev/ttySAC1 ============================================== And account application is send a mail to [EMAIL PROTECTED] without content and title. And not all mail account are accepted/could get reply, I tried openmoko.com account not work but my personal gmail works fine. Since the protocol is pretty straight forward, implement an extra proxy to scale up user should be easy. And olv has a GPS test program called AGPS UI in following address: http://projects.openmoko.org/scm/?group_id=127 You could check out and have a try, with "A"GPS support could cut TTFF time from 40 secs to 10-20 seconds. And the valid time of assist now download is about 4 hours. You could also check the following address: http://embedded-system.net/assistnow-gps-services-boost-up-gps-receiver-performance-u-blox.html Due to the u-blox 4 need to have extra flash to storage up to 14 days of offline data (90 KBytes), GTA02 don't have it. I would very interested if there is another way to twist it around, but not likely, so far. Offline sample data you could find in the following addesss: http://alp.u-blox.com/ And u-blox did provided source code of Assist offline server implementation and ubx header, you could find it here: http://people.openmoko.org/tony_tu/src/u-blox > Other AGPS features seem to rely on gsm communication with a server > - sending GPS data to that server which helps calculating the position > - getting additional data about the position from a server > - even get the precise position measured by gsm triangualtion For u-blox assist now, you have to provide approximate longitude/latitude to get the corresponds "almanac" and "ephemeris" package. This might be base on application design for how to provide the longitude/latitude. User could select the location area from list menu or world map, or better implementation using the GSM/wi-fi location technique/service. > 3. Which of these services are available in a common gsm network in > Germany/Europe/worldwide? Can these services be used by GTA02? > The limit from software side of view should same as google map mobile version. Regards, Tony Tu ( Neng-Yu Tu ) _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
