Apparatus for the detection of buried objects
First Claim
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1. Apparatus for detecting objects buried below the surface of the earth, comprising:
- (a) transmitter means for generating short, monocycle pulses of signals,(b) antenna means spaced from and movable over said surface for radiating said signals to and receiving reflections from said surface, said reflections comprising a plurality of signals spaced in time each of which having a characteristic waveshape,(c) receiver means connected to said antenna means for generating an output signal in response to said reflections,(d) soil lock circuit means responsive to the receiver means output signal for detecting the center of a symmetrical waveshape comprised within said reflections which represents the signal reflected from the surface of the earth, said soil lock circuit means developing as an output an error signal, and(e) means for controlling said receiver means in response to said error signal.
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Abstract
Apparatus for the detection of buried objects comprising a broadband, high resolution short pulse transmitter and a bistatic or monostatic noncontacting antenna for radiating the transmitted signal through the ground for reflection from a buried object, a sampling type receiver which reduces the bandwidth and center frequency of the received signal, and a locking circuit controlled by the first reflection from the ground or soil surface to thereby lock the range sweep to the soil surface and eliminate the effects of antenna height variations.
64 Citations
18 Claims
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1. Apparatus for detecting objects buried below the surface of the earth, comprising:
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(a) transmitter means for generating short, monocycle pulses of signals, (b) antenna means spaced from and movable over said surface for radiating said signals to and receiving reflections from said surface, said reflections comprising a plurality of signals spaced in time each of which having a characteristic waveshape, (c) receiver means connected to said antenna means for generating an output signal in response to said reflections, (d) soil lock circuit means responsive to the receiver means output signal for detecting the center of a symmetrical waveshape comprised within said reflections which represents the signal reflected from the surface of the earth, said soil lock circuit means developing as an output an error signal, and (e) means for controlling said receiver means in response to said error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification