Stepped frequency ground penetrating radar

Patent · Sat Jan 01 04:00:00 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

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