Stepped frequency ground penetrating radar

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869376

Vadnais, Kenneth G ^[1]; Bashforth, Michael B ^[2]; Lewallen, Tricia S ^[3]; Nammath, Sharyn R ^[4]

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1. Ojai, CA
2. Buellton, CA
3. Ventura, CA
4. Santa Barbara, CA

A stepped frequency ground penetrating radar system is described comprising an RF signal generating section capable of producing stepped frequency signals in spaced and equal increments of time and frequency over a preselected bandwidth which serves as a common RF signal source for both a transmit portion and a receive portion of the system. In the transmit portion of the system the signal is processed into in-phase and quadrature signals which are then amplified and then transmitted toward a target. The reflected signals from the target are then received by a receive antenna and mixed with a reference signal from the common RF signal source in a mixer whose output is then fed through a low pass filter. The DC output, after amplification and demodulation, is digitized and converted into a frequency domain signal by a Fast Fourier Transform. A plot of the frequency domain signals from all of the stepped frequencies broadcast toward and received from the target yields information concerning the range (distance) and cross section (size) of the target.

• Research Organization: EG & G ENERGY MEASUREMENTS INC
• DOE Contract Number: AC08-88NV10617
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5325095
• OSTI ID: 869376
• Country of Publication: United States
• Language: English

Related Subjects

stepped
frequency
ground
penetrating
radar
described
comprising
rf
signal
generating
section
capable
producing
signals
spaced
equal
increments
time
preselected
bandwidth
serves
common
source
transmit
portion
receive
processed
in-phase
quadrature
amplified
transmitted
target
reflected
received
antenna
mixed
reference
mixer
output
fed
pass
filter
dc
amplification
demodulation
digitized
converted
domain
fast
fourier
transform
plot
frequencies
broadcast
yields
information
concerning
range
distance
size
frequency signals
dc output
penetrating radar
stepped frequency
frequency domain
rf signal
reference signal
fourier transform
receive antenna
signal source
described comprising
pass filter
frequency signal
quadrature signals
reflected signal
signal generating
ground penetrating
fast fourier
frequency ground
generating section
quadrature signal
domain signal
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