I have just completed a project that may be of
interest to some of those of you working on techniques
to that use signal strength to determine location.
(The project report is posted at http://www.tereus.net
)
The primary objective of this project was to
understand the radio propagation characteristics of
the Berkeley Mica mote and get an idea of what factors
affect signal strength. The Mica mote radios were
measured in a controlled lab environment and an open
air test range. In addition to measuring the antenna
propagation patterns, the effects of multipath fading
were observed and show that in this environment the
signal strength does not always decrease as the
receiver moves away from the transmitter. The results
illustrate some of the problems that need to be
overcome if RF signal strength alone is to be used as
an estimate of location. It also includes some good
references on antenna measurement and signal
propagation.
I hope you find it useful. Please feel free to contact
me if you have any questions (see my website for
contact info).
Tereus.
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