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
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