Electronic Tether Project: Digital Subsystem
Jeff DeMott and Luke Moranda
Advisors: Dr. James Sennott and Dr. B. D. Huggins
Monitoring a young child in a crowded public area can be a difficult
job. The electronic tether addresses this problem. The electronic tether
is a child monitoring device which measures the distance between the child
and parent, setting off an alarm to alert the parent when the child has
wondered too far away. Existing systems that attempt this distance measurement
are based on estimating propagation loss. This has proven to be inaccurate
due to interference, multipath, and varying component attenuations. Using
more sophisticated correlation techniques, the dependency of the measurements
upon signal strength has been eliminated. Measuring the correlation between
two reference signals and the received signal delayed by the round-trip
path delay, yields an accurate distance measurement.
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