John Warhus Phones & Addresses
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Richmond, CA
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1889 Mill Springs Cmn, Livermore, CA 94550
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Brentwood, CA
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Fremont, CA
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San Leandro, CA
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1529 Oscar St, Richmond, CA 94804 (510) 520-5337
Emails
j***s@comcast.net
Publications
Us Patents
Ultra Wideband Ground Penetrating Radar Imaging Of Heterogeneous Solids
View pageUS Patent:
58350543, Nov 10, 1998
Filed:
May 9, 1997
Appl. No.:
8/853548
Inventors:
John P. Warhus - Brentwood CA
Jeffrey E. Mast - Livermore CA
Jeffrey E. Mast - Livermore CA
Assignee:
The Regents of the University of California - Oakland CA
International Classification:
G01S 1304
G01S 1389
G01S 7292
G01S 1389
G01S 7292
US Classification:
342 22
Abstract:
A non-invasive imaging system for analyzing engineered structures comprises pairs of ultra wideband radar transmitters and receivers in a linear array that are connected to a timing mechanism that allows a radar echo sample to be taken at a variety of delay times for each radar pulse transmission. The radar transmitters and receivers are coupled to a position determining system that provides the x,y position on a surface for each group of samples measured for a volume from the surface. The radar transmitter and receivers are moved about the surface, e. g. , attached to the bumper of a truck, to collect such groups of measurements from a variety of x,y positions. Return signal amplitudes represent the relative reflectivity of objects within the volume and the delay in receiving each signal echo represents the depth at which the object lays in the volume and the propagation speeds of the intervening material layers. Successively deeper z-planes are backward propagated from one layer to the next with an adjustment for variations in the expected propagation velocities of the material layers that lie between adjacent z-planes.