Niitek, Inc.

Chemring Sensors and Electronic Systems, Inc.

Mark Hibbard

Howard M Bandell

David Wilens

William Cummings

James F Clodfelter

Brian A Whaley

Jason T Wolfson

Ali Etebari

Roy Fields Cleveland, Iii

Steven Lavedas

Ajay Patrikar

Jason Wolfson

A system for providing signal trigger pulses comprises an equivalent time sampling unit providing transmit and receive trigger pairs, and a control unit controlling the equivalent time sampling unit to provide pseudorandom delay length variations between the trigger pairs.

Systems and methods for providing trigger timing

A hybrid ground penetrating radar (GPR)/metal detector (MD) head includes a V-dipole GPR antenna and transmit and receive MD coils. One of the MD coils is arranged in a quadrupole configuration with a crossbar, and the V-dipole antenna is perpendicular to the crossbar. The legs of the V-dipole antenna may straddle the crossbar or may be on one side of the crossbar. The MD coils may be fabricated on a printed circuit board, which may be at a non-normal angle with respect to a central axis of the V-dipole antenna.

Metal detector and ground-penetrating radar hybrid head and manufacturing method thereof

A ground penetrating radar system is described that is able to create both low frequency, wide pulses, and high frequency, narrow pulses, to enable both deep and shallow operation of the ground penetrating radar on demand, including simultaneous operation.

Adjustable pulse width ground penetrating radar

A radar array linearly traverses an area of ground. Additional radar elements fore and aft of the array detect changes in elevation and orientation of the array. These elements act as a preview for the height changes due to ground variation. Any variation in height that is not detected by these fore and aft-mounted elements is thus due to variation in radar elevation and/or orientation and can be subtracted from the resulting data without introducing distortion. Correction factors are applied to the range data returned from each element in the array, which normalizes the data and makes it appear as if the array did not change orientation or elevation.

Leading and lagging aperture for linear ground penetrating radar array

Time domain radar signals are transmitted and received from vee dipole antennas on circuit boards. The antennas are formed by spaced deposited copper pads and discrete surface mount resistors soldered between the copper pads. The antenna feed-points are connected directly to adjacent transmitting and receiving circuits on the same printed circuit board. Traces are printed on a middle layer of a strip of printed circuit board. Vias connect ground planes on opposite sides. Artifacts are reduced, and signal properties are controlled.

Method and apparatus for transmitting and receiving time-domain radar signals

A system for analyzing and displaying radar information comprises: a transmit and receive unit operable to transmit radar signals to a survey volume and to receive radar returned radar signals, a processing unit operable to: receive radar data from the returned radar signals, reduce the data into depth bins, each with a score based on received signal strength, create connections among depth bins based on respective scores, and to eliminate ones of the depth bins that do not meet a threshold number of connections, the system further comprising a display unit operable to create a display of at least a subset of the depth bins that are not eliminated by the processing unit.

System, method, and computer program product providing three-dimensional visualization of ground penetrating radar data

A system for processing a signal comprises a transmit unit to transmit a signal, and a receive unit receiving the signal and performing equivalent time sampling thereon by sampling each cycle of the received signal and reconstructing the received signal from the samples, wherein the receive unit applies a plurality of down-conversion rates to the equivalent time sampling for an acquisition window.

Systems and methods using multiple down-conversion ratios in acquisition windows

A variable delay apparatus comprises a calibrating unit receiving a signal from a variable delay unit and from a plurality of fixed delay sources, the calibrating unit comparing the signal from the variable delay unit with a plurality of signals from the fixed delay sources to control operation of the variable delay unit over a delay range independently of environmentally-induced drift.

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Arlington, VA, United States of America

Mark Hibbard