Geo-centers, Inc.

Sheldon S Sandler

Alan L Crandall

Daniel Schwarzkopf

Rudolph Borkowski

Gilbert Johnson

A method and apparatus for resolving a radar return by an object or layer below the earth's surface from a radar return of an air-to-earth interface. More specifically, a method and apparatus for generating short pulsewidth, broad bandwidth RF signals and for effecting control and timing of transmitted and received radar signals in order to focus an antenna illumination pattern. The apparatus includes an antenna array including a plurality of antenna elements which transmit and receive the RF pulsed signals and a custom control module which generates the control signals fed to the antenna array to delay the RF pulse signals with respect to each other, upon transmission and receipt, in order to form transmit and receive antenna illumination patterns.

Focused array radar

A broad band dipole antenna of short length is formed by two tubular linear radiators which are spaced apart at their adjacent inner ends. Each of the radiators is encased in an electrically insulative sleeve and the antenna is liquid loaded along its length by a jacket of conductive fluid disposed between the insulative sleeve and an insulative tubular housing surrounding the radiators. The dipole is center-fed and each of the radiators, at its outer end, terminates in a connection to one end of a lumped resistive load whose other end is connected to a conductive disk that is in contact with the conductive liquid.

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Lexington, MA, United States of America

Sheldon S Sandler