Cross correlation of code and shifted code computed with a FFT.
Sound waves reflecting off a hard target.
A simple computer system for measuring range. Enclosed dashed lines show which functions are either performed in software or are internal to the computer.
Carrier demodulation using the Hilbert transform.
Sample Labview program output for sonic/ultrasonic ranging system. The target was a large metal file cabinet. The large return was from the front of the cabinet and the second smaller return was from a set of glass doors behind the cabinet.
Experimental setup for an ultrasonic ranging system capable of transmitting a carrier up to 45 kHz.
Home experiment configuration using a computer speaker/amplifier and microphone embedded in an oil funnel. Note that the microphone slips loosely inside the narrow mouth oil funnel, which has the narrow end cut off.
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