Salve Richard! Ahh, it seems that the idea of distributed lightning detection has inspired you for something (maybe) more usefull *g*
On Wed, 13 Dec 2006, Richard Franks wrote: > Would we be violating the license by redistributing this data, or > additional data based entirely upon that data source to other Neo1973 > units? AFAIK no. Otherwise NTRIP casts would illegal as well. > I'm wondering about the possibility of leveraging off the fact that > all Neo1973 units should have a very unified idea of the current time > to increase the fix accuracy. > > For example, if you have three Neo1973s in a rough geographic > triangle, such that: > Neo 1 - has LOS to satellites a,b,c,d > Neo 2 - has LOS to satellites c,d,e,f > Neo 3 - has LOS to satellites a,c,d,f > > Each unit computes a positional fix with 5m accuracy as normal, but > all at the same coordinated time. GPS normaly needs the signal from 4 satellites - what about instead of making the accuracy higher, helping neo4 that could receive data from ony 3 satellites? > Scaling this up to a downtown city environment, where you could have > 100 Neo1973's with a 5 mile radius... if they all took positional > fixes at the same time, would it be possible to use all of this > coordinated data, plus the ephemeris info, to increase the fix > accuracy? - Nice idea, but how to feed the GPS chip whith this? (Close Chip, close binary in user mode) - How to avoid that other users could track you? - and with 100 receivers there would be a need for a smart distributed calculating... - traffic? 4x100x50 bit/s? 20kbit/s realy so few? To have exact time stamps and sender id there must be a big overhead? I'm not so conviced that such a brute force with 100 receivers would help with errores due e.g. Ionosphere because non of this recievers is a fixed/stationary one and a fixed public receiver in the city with receiving a,b,c,d,e,f would help more. But shure, there should be a way that a local receiver network would be usefull. At last to have one Neo in the car and getting the needed assited data inside a building from this directly (Wi-Fi, PMR). So a little more information about AGPS but also about the globallocal chip, which data could be acessed would help... Greetings, rob _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community