Ian Stirling schrieb: > Nils Faerber wrote: >> Hi! >> I am interested in doing a little research on the AGPS part. As far as I >> understood the used Hammerhead chip will dump out the more or less raw >> GPS data into userland which will then need to be post-processed in >> order to get the usual NMEA or whatever messages. >> So, can OpenMoko provide at least somemore information about that chip >> and especially its output? > No, the chip is under NDA.
Darn. I do not care aout most of the chip, just the output format ;) > http://wiki.openmoko.org/wiki/Hardware:AGPS has the current state of play. > Basically, the satellite format is known, and not especially hard to > decode especially if we also get NMEA (or whatever) output out of the > supplied daemon at the same time to decode it. You mean some kind of reverse engeneering trying to match the NMEA output to the raw input? > There is all sorts of wacky stuff - for example, peer-peer DGPS that can > be done, where all stationary neos on charge with a GPS signal and a > free internet connection contribute to a global ionospheric model. > Then any Neo can connect to this model, download 200 bytes or so, and > get +-0.3m (or better) position for a short while. Exactly. Also relative positioning can be made much more precise using the raw data (AFAIK in the range of cm not m). 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 -- _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community