On 5/12/18 5:01 PM, Adrian Godwin wrote:
How about a demonstration of how GPS works, substituting sound waves for
radio ?
Maybe three sound sources with harmonically-related frequencies, then
measure their phase difference on an oscilloscope.
Cheat a bit : you don't need to do cdma acquisition. Have one reference at
a low frequency, switch two more on alternately at a higher frequency.
Measure the phase difference between one pair at a time and calculate your
location relative to the stationary sources.
In science fairs that are judged, the rubric really demands something
that can be cast into the classic "literature search, hypothesis,
experiment, data reduction, conclusion" form. Even straight up
engineering is sometimes knocked down - the International Fair (being
held this week, as it happens) does have separate rubric for engineering
projects.
So what you want to do is cast this as an experiment or engineering
project. For the latter: "Performance characterization of acoustic
multilateration"
For a more "sciencey" approach, you'd postulate some theory/hypothesis:
"air temperature measurement can be used to compensate for speed of
sound variation in acoustic multilateration"
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