I've verified the issue on GPS receiver in GTA02: When dump ALM/EPH messages, in several messages, fields follow SV ID field in payload are filled with zeros.
Daniel Willmann wrote: > > On Sun, 1 Mar 2009 14:25:14 -0800 (PST) > mqy <meng.qing...@gmail.com> wrote: > >> " >> UBX-AID-EPH and UBX-AID-ALM Messages for Satellite without valid >> Orbits When polling UBX-AID-EPH or UBX-AID-ALM messages, satellites >> without valid ephemeris or almanac data will >> return a complete UBX-AID-EPH or UBX-AID-ALM message with all data >> words set to zero. This doesn’t comply >> with the protocol specification. Furthermore, u-blox 5 receivers with >> firmware V5.00 and earlier can run into a >> floating-point exception when fed with such “empty” ephemeris. >> " >> >> Is that the cause :D > > Yeah, thought that at first as well, but almanac data was okay at that > point. The position was not, however. I guess the problem the chip > tripped over is similar in both cases though. > > Regards, > Daniel Willmann > > > _______________________________________________ > Openmoko community mailing list > firstname.lastname@example.org > http://lists.openmoko.org/mailman/listinfo/community > > -- View this message in context: http://n2.nabble.com/thoughts-on-A-GPS-offline-tp2338403p2415564.html Sent from the Openmoko Community mailing list archive at Nabble.com. _______________________________________________ Openmoko community mailing list email@example.com http://lists.openmoko.org/mailman/listinfo/community