| ABSTRACT:
A cost-effective ultra-wideband radar system capable of locating
nearby buried objects such as reinforcing steel rods, pipes, and other
objects buried in concrete, soil, behind walls, or in the air. A sequence
of ultra-wideband radar pulses are emitted without a carrier and the system
detects deflected pulse energy caused by the transmitted pulse whenever
encountering a change in the medium i.e. an air to metal change or concrete
to metal change. This reflected energy is detected and visually displayed.
The range gate delay is continuously varied, thus changing the distance
from the unit to where the reflected energy would be potentially detected
from the target. By continuously sweeping the "depth" of the scan, the
operator need only move the unit in two dimensions across the surface to
detect objects buried or hidden at varying depths interior to or behind
the surface. The range gate system includes a multipoint ackground subtraction,
corrected gain with distance, linear range gate time correction and a dielectric
constant correction for a calibrated distance display. |