search for "rssi location" and various other combinations. there has been a lot of work done on this, and none of it is very accurate.
MS Matthew Jacques wrote: > Hello, > > I am currently trying to build a WSN using MicaZ motes and I need to > know, to a fair degree of accuracy, how far apart one node is from > another. I was reading up on how it is possible in some cases to use > RSSI and LQI to achieve this. I tried taking measurements of average > RSSI when the nodes were 1.5, 2 and 2.5 meters apart but the results > were very erratic. While I did notice that the RSSI tended to be higher > when the nodes were further away from each other, the results were not > accurate enough to place the node within even 4 meters of its actual > location. > > Is RSSI not an accurate enough way to get the precision I need? If not > is there any other method I can use to get the distance between nodes? > > I was also thinking of maybe using the system time of the nodes to time > how long a signal took to travel between them but I figured that with > the time to send and the turnaround time of the message in the other > node this would be a pretty inaccurate way to do it. Is that even worth > trying? > > Thanks, > > Matthew Jacques > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
