Accurate distance measurement using RF techniques
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United States of America Patent
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-
Feb 22, 2005
Grant Date -
Oct 16, 2003
app pub date -
Jan 16, 2001
filing date -
Jan 16, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system, apparatus, and method for determining the distance between two objects using an indirect propagation delay measurement is disclosed. A frequency hopping scheme (such as the Bluetooth.TM. technology) is used to measure the relative phase offset of the received signal between the various frequencies. For a given distance between the objects, the phase offset vs. frequency curve is a straight line with the slope dependent upon the measured distance. After the phase of the received signals is detected, the data is plotted on a curve and the slope is calculated.
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