User's Manual

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Trace:

At each point of measurement along the profile, a specific

number of samples are collected. Together, these samples

make up a trace, an envelope of the received waveform.

Profile:

A collection of traces along a line or transect.

Direct wave:

This is the part of the energy that travels the shortest distance

between the transmitter and the receiver. When collecting a

sample, the CUII sends a timing signal (a control signal) to the

transmitter and receiver antenna respectively. After the

transmitter has received the signal, it generates and transmits

radar pulses through the antenna. The pulse then propagates

through the medium. Reflections occur from underground

objects, structures and other materials where there are

changes in subsurface electrical properties.

Once the receiver has detected the control signal, it collects a

sample and passes it to the CUII. By repeating this process at

very finely controlled intervals, the CUII can collect all the

samples in a trace. The CUII places each incoming sample in

its correct position in the current trace. When the trace is

complete, it is sent to the computer where it is saved on the

hard disk and displayed on the computer monitor.

During data collection, the whole system is transported along

the line to be investigated, while collecting and recording

traces at defined distance or time intervals. The result is a

continuous profile record of subsurface conditions along that

line (see Fig 2.2), a so-called radargram.