[Tinyos-help] Displaying RSSI value in TOSSIM using TinyViz

[Philip Levis]

On Sep 5, 2006, at 9:44 AM, Tarun Bansal wrote:

> Right...The simple path loss model:
>
> PowerReceived  = PowerTransmitted / PathLoss
> where PathLoss  = (4*pi*distance/Wavelength)^(path loss exponent)
>
> won't be sufficient in all cases.
>
> Some other exhaustive path loss model will have to be used. A lot of
> such models should be already available in "Communications"..
> That would be sufficient


The issue is that the simple path loss models don't really reflect  
what motes observe. There are hardware variations, uneven  
propagation, receiver/transmitter calibration issues, etc. One of the  
important observations of all of the RSSI-based localization work has  
been that RSSI is *not* as regular as you'd like, and this is where  
all of the challenges come from.

Phil