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Title: Stepped frequency ground penetrating radar

Abstract

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.

Inventors:
 [1];  [2];  [3];  [4]
  1. (Ojai, CA)
  2. (Buellton, CA)
  3. (Ventura, CA)
  4. (Santa Barbara, CA)
Issue Date:
Research Org.:
EG & G ENERGY MEASUREMENTS INC
OSTI Identifier:
869376
Patent Number(s):
5325095
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
AC08-88NV10617
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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; /342/

Citation Formats

Vadnais, Kenneth G., Bashforth, Michael B., Lewallen, Tricia S., and Nammath, Sharyn R. Stepped frequency ground penetrating radar. United States: N. p., 1994. Web.
Vadnais, Kenneth G., Bashforth, Michael B., Lewallen, Tricia S., & Nammath, Sharyn R. Stepped frequency ground penetrating radar. United States.
Vadnais, Kenneth G., Bashforth, Michael B., Lewallen, Tricia S., and Nammath, Sharyn R. Sat . "Stepped frequency ground penetrating radar". United States. https://www.osti.gov/servlets/purl/869376.
@article{osti_869376,
title = {Stepped frequency ground penetrating radar},
author = {Vadnais, Kenneth G. and Bashforth, Michael B. and Lewallen, Tricia S. and Nammath, Sharyn R.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

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