On Friday 01 September 2006 10:12 pm, Rony wrote: > jtd wrote: > > No way man, your opinion is most valuable. I like the way you > foresee things.
Umm. I did not others did. I just happened to read the right stuff and the good fortune of working on many complex and interesting things. > You are right on that. Later, I was wondering too how an > omni-directional transmitter can give directions to people standing > on different roads, so one man's left will be another's right and > so on. This could be resolved through some method of seeking the > user's position first and then tx will reply accordingly. The pole > that picks up the strongest signal guesses the user location nearby > and internally sends this info to other poles. The poles could use > 4 directional receivers to guess user location with better > accuracy. You do not rely on signal strength cause that is dependent on everything and the cat. You use time stamps either as actual time or a periodic signal. In either case all the devices in the computing chain need to sync and be extremely accurate. In the cae of gps a few microseconds drift will result in several meters of inaccuracy. The shorter the distance to be measured the higher the accuracy, including relative accuracy. for our situation we require centimeter accuracy over tens of meters. which would translate to nano sec resolutions. The costs would be impossible. Precision guidance systems use inertial navigation (gyro compass) and verrrryyy high accuracy initial location. -- Rgds JTD -- http://mm.glug-bom.org/mailman/listinfo/linuxers
