Metal target detection system
First Claim
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1. A metal detection system comprising:
- means for radiating a spread spectrum signal to a metal target having a non-linear electrical response characteristic, said target radiating a harmonic signal in response to said spread spectrum signal;
means for receiving the harmonic signal; and
means for compressing and detecting the harmonic signal.
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Abstract
A system for differentiating between targets containing non-linear metal element junctions and their surrounding non-metallic environment. A spread spectrum illuminating transmitter is used in conjunction with correlation circuits in a receiver to enhance its signal to interference ratio and reduce required peak power level in the illuminator/transmitter.
24 Citations
8 Claims
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1. A metal detection system comprising:
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means for radiating a spread spectrum signal to a metal target having a non-linear electrical response characteristic, said target radiating a harmonic signal in response to said spread spectrum signal; means for receiving the harmonic signal; and means for compressing and detecting the harmonic signal. - View Dependent Claims (2, 3, 4, 5)
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6. A system for guiding a mobile vehicle to a metallic target having a non-linear electrical response characteristic, comprising:
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transmitting means for generating and directing a spread spectrum signal to said target, said target radiating a harmonic signal having a harmonic component in response to said spread spectrum signal, and said vehicle having receiving means for receiving and compressing said target harmonic signal for detecting said target. - View Dependent Claims (7, 8)
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Specification