EARTH-PENETRATING RADAR WITH INHERENT NEAR-FIELD REJECTION
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United States of America Patent
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Jun 16, 2009
Grant Date -
Jul 2, 2009
app pub date -
Jun 29, 2006
filing date -
Jun 29, 2006
priority date (Note) -
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Abstract
A ground-penetrating radar comprises a transmitter for launching pairs of widely separated and coherent continuous waves. Each pair is separated by a different amount, such as 10 MHz, 20 MHz, and 30 MHz. These are equivalent to modulation that have a phase range that starts at 0-degrees at the transmitter antenna which is near the ground surface. Deep reflectors at 90-degrees and 270-degrees will be illuminated with modulation signal peaks. Quadrature detection, mixing, and down-conversion result in 0-degree and 180-degree reflections effectively dropping out in demodulation.
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