Acoustic radar project for students

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cowboy3
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I came across an article in American Journal of Physics recently that describes how to build an acoustic radar by transmitting a carrier modulated with pseudo-noise code through a speaker and simultaneously receiving the reflection with a directional microphone. One then does some signal processing to get the resulting pulse profile as a function of distance. It was originally conceived as a radar or lidar simulator.

http://ajp.aapt.org/resource/1/ajpias/v79/i12/p1240_s1

Laptop on a grey cloth showing a plot of a noisy signal with a sharp spike, connected to a small beige speaker on the left and a black conical horn on the right.
 
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  • Laptop on a grey cloth showing a software plot of a signal trace, connected to a cream-coloured powered speaker on the left and a black conical horn on the right.
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I think the term acoustic radar and sodar are commonly used for sonar in air though sonar is correct also.