System using spread spectrum modulation for locating underground objects
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United States of America Patent
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Apr 3, 2001
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N/A
app pub date -
May 26, 1999
filing date -
May 26, 1999
priority date (Note) -
Expired
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Abstract
The location of underground objects such as pipes and conduits are located by detecting electrical signals emitted by the underground objects where the radiated signals include spread spectrum modulated RF signals. The system can operate in a passive or active mode, and in the active mode pseudo-noise (PN) generators can be employed or frequency-hopping can be employed. The use of spread spectrum minimizes or eliminates conflicting signals radiated from a plurality of underground objects and can improve signal to noise ratio of the detected signals.
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