SPX SPIDAR NIC-500s Operation Manual page 47

4.3.4 GPS
The user has the following options for configuring the GPS parameters (Figure 4-21):
•
GPS Device – Use this dropdown to select the External GPS or turn GPS off. If the user
selects External, they can attach an
•
Baud rate – This option only appears if External GPS is selected. The baud rate is the
speed that data is sent from the GPS receiver to the serial port of the NIC-500, specific
to the GPS manufacturer. Using the dropdown box, it can be set to one of the following
values: 4800, 9600, 19200, 57600 or 115200.
•
External Power - This option only appears if External GPS is selected. The serial port
on NIC-500 can also output power, thereby enabling a single cable to be used for the
GPS (for power and data). This is specific to the GPS that is sold by Sensors &
Software.
•
Positions – input the coordinate of the GPS relative to the origin of your configuration as
set in Section
ground.
•
Latency -
The GPS latency time is the time difference between when the GPS receiver
obtains its position and when it is logged by the NIC-500. If GPS latency time is not
corrected for, the GPS position of targets and features of interest in the GPR line is less
accurate. GPS latency is not a large problem when GPR data are collected on slow-
moving platforms such as the SmartCart or SmartTow; it has the largest effect when
trying to determine the true position of a fast-moving platform such as the SmartChariot.
Figure 4-20: GPR1 & GPR2 must have the same points per trace
4.3.2. The 'Z' position will be the height of your GPS receiver from the
optional GPS to the system via the serial cable.
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SPIDAR Software