SPX SPIDAR NIC-500s, Operation Manual

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SPIDAR Software
53
GPR Windows
There will be a window displayed for each GPR channel (port) used. For example, if there are 2
NIC-500s, each with 2 Noggin systems, then four channels of data will be displayed. The NIC-
500 and channel will be indicated for each window. Section 4.4.1 explains the data presented in
these windows.
4.5.1 Collecting data
Press Start in the Line Scan window to begin acquisition. Press Stop in that same window to
end the line.
Once data acquisition begins, the data scrolls from right to left for each window. Data is plotted
as distance traveled along the horizontal axis, and time window on the vertical axis. The
waveform is also displayed to the right of the GPR data. To the right of that, the following
information is displayed:
•
Stacks
– shows the number of stacks for the last GPR trace.
•
Skipped traces - indicates the number of traces that were not collected, or skipped,
usually due to speed of movement. Each trace takes a certain amount of time to collect
(which increases as the time window or number of stacks increase). If the user attempts
to collect another trace (that is, by moving fast) before the first is completed, the first
trace will be skipped. This number adds up during the line acquisition. Knowing this, the
user can then change parameters of their survey to minimize skipped traces.
NOTE: Maximum number of traces for one line is limited to the lesser of either 1,000,000
traces or 200 MB individual file size.
4.6 Admin
The Admin section describes updating software, setting time/date, and system information.
Each tab is described in detail below.
4.6.1 System Admin
The system admin tab displays an overview of version numbers for the SPIDAR software, as
well as the version and serial numbers for connected antennas (Figure 4-36).