Early days of EMRAD and it's first Ground Probing Radar system

Magazine Article.
Microwave and RF Egineering
June/July 1989 .

The first ground probing radar data collection system, as decscribed in the document above.
The custom made electronics module containing the microwave pulse generator.
The first complete ground probing radar (GPR).
At this time we had no mechanical workshop hence it's 'prototype' look.

Antenna and Microwave design: Dr Richard Chignell
Mechanical design and build: Charles Harrison
Electronic design and build: John Stemp
The main electronics.
Left: The clock and timing PCB
Centre: A/D conversion PCB
Right: Communications PCB
The sampling system.
A Tektronix S6 Sampling head was used
as the receiver.
The microwave 'plumbing'.
This is a plot of the unprocessed data collected by the GPR.
The vertical axis is depth and the horizontal is distance.
It shows a cross section of ground containing a plastic pipe.
This is a plot of the processed data collected by the GPR.
The vertical axis is depth and the horizontal is distance.
It shows a cross section of ground containing a plastic pipe.
Note the removal of the surface 'clutter'.
This is a colour scan of the processed data.
The vertical axis is depth and the horizontal is distance.
It shows a cross section of ground containing a plastic pipe.
Note the orange line showing the surface.
Data collection in a New York street using the now much updated model of the EMRAD GPR. June 1993
Data collection in a New York street Assisted by Irv Schneider and Bob Meade. June 1993.