A Low Cost Remote Sensing System Using PC and Stereo Equipment
Joel F. Campbell, Michael A. Flood, Narasimha S. Prasad, Wade D., Hodson

TL;DR
This paper presents a cost-effective remote sensing system utilizing standard PC and stereo audio equipment, capable of object detection and basic measurements, serving as an educational tool for remote sensing and digital signal processing.
Contribution
It introduces a low-cost remote sensing system using common audio equipment and PC, demonstrating its utility for education and basic measurements.
Findings
System can detect objects using audio signals
Uses pseudorandom noise modulation for measurements
Suitable as an instructional tool in remote sensing
Abstract
A system using a personal computer, speaker, and a microphone is used to detect objects, and make crude measurements using a carrier modulated by a pseudorandom noise (PN) code. This system can be constructed using a personal computer and audio equipment commonly found in the laboratory or at home, or more sophisticated equipment that can be purchased at reasonable cost. We demonstrate its value as an instructional tool for teaching concepts of remote sensing and digital signal processing.
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