On 2/1/2013 3:45 AM, Hal Murray wrote: > rickhar...@gmail.com said: >> I would like to triangulate a position of a device which moves using 3 fixed >> positions devices of known location. The idea is to have these operate on >> 915mhz or 434mhz or 2.4ghz or appropriate frequency. >> I'd like a range of 150 feet or better and accuracy of 3 feet or better. Doing this on radio will be tough. You are likely to need on the order of 10 or 20 MHz of ranging bandwidth to get the accuracy you want. This is also overkill in the extreme.
For this range an line of sight I'd do it acoustically. Get some piezoceramic transducers and do it at 40 KHz or so. Transducers are ~$6 in single quantities. http://www.mouser.com/ds/2/209/KT-400482-193462.pdf Time of flight is about 13.5 inches per *milli* second, so your microprocessor will have time to do it's nails after processing ranging data. You should also get good accuracy and resolution. In general you shouldn't need to if you are using active transmitters at both ends, but if you are worried about multipath reflection use a PN code and use the first correlation peak. Rich -- mailto:o...@ozindfw.net Oz, N1OZ POB 93167 Southlake, TX 76092 (Near DFW Airport) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.