Oblique scanning ground penetrating radar
First Claim
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1. A ground penetrating radar providing images of beneath a surface of the earth comprising:
- a radar transmitter providing a microwave electrical signal;
a radar antenna receiving the electrical signal from the radar transmitter to produce a transmitted radar signal, the radar antenna having a primary transmission axis along a direction of greatest power of the radar signal;
an antenna head supporting the radar antenna with respect to the surface of the earth so that the radar antenna'"'"'s primary transmission axis intersects the surface of the earth at substantially a Brewster angle being a function of the dielectric constant of the earth;
a radar receiver receiving reflected radar signals from the radar antenna; and
an electronic computer processing the received radar signals to output an indication of the materials beneath the surface of the earth;
wherein the radar signals indicate time delays in echoes from material beneath the surface of the earth; and
wherein the computer operates according to a stored program to shift the radar signals with respect to each other to simulate the reception of radar signals over a curved surface focused on the points beneath the surface of the earth;
wherein the computer operates to simulate reception of the radar signals over a curved surface where radar signals take equal time to travel from a given point beneath the surface of the earth to all points on the curved surface.
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Abstract
A ground penetrating radar uses an oblique or grazing angled radiation beam to provide improved coupling of radar energy into the earth reducing forward and back scatter and eliminating the need to traverse the surface of the earth directly over the investigated volume.
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Citations
8 Claims
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1. A ground penetrating radar providing images of beneath a surface of the earth comprising:
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a radar transmitter providing a microwave electrical signal; a radar antenna receiving the electrical signal from the radar transmitter to produce a transmitted radar signal, the radar antenna having a primary transmission axis along a direction of greatest power of the radar signal; an antenna head supporting the radar antenna with respect to the surface of the earth so that the radar antenna'"'"'s primary transmission axis intersects the surface of the earth at substantially a Brewster angle being a function of the dielectric constant of the earth; a radar receiver receiving reflected radar signals from the radar antenna; and an electronic computer processing the received radar signals to output an indication of the materials beneath the surface of the earth; wherein the radar signals indicate time delays in echoes from material beneath the surface of the earth; and wherein the computer operates according to a stored program to shift the radar signals with respect to each other to simulate the reception of radar signals over a curved surface focused on the points beneath the surface of the earth; wherein the computer operates to simulate reception of the radar signals over a curved surface where radar signals take equal time to travel from a given point beneath the surface of the earth to all points on the curved surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification