3-System Setup Parameters
pulseEKKO PRO
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3.3.3 Free Run Trace Delay
When the system is run in Free-Run mode (Section 3.3.1.3: P43), this option allows the user can specify a
time delay (in seconds) between traces. This delay allows time for the user to set up the antennas at the
new position. The computer automatically collects the next trace after the elapsed time has passed.
The Trace Delay is input in tenths of seconds, between each data collection point. To run the system as
quickly as possible, set this value to 0.0 seconds. For a longer time delay, use the buttons to set the value.
Factors as the radar site, operator experience, weather, etc. will determine how long the delay time should
be. Trial and error will decide the appropriate setting.
3.3.4 GPS Parameter Menu
The Global Positioning System (GPS) uses special satellites around the Earth to determine the position of
a GPS receiver located anywhere on the surface of the Earth. GPS receivers can be purchased from a
number of manufacturers.
The DVL has a serial port on the back for attaching a GPS receiver (Section 2.5.5: P24). This port will
accommodate any GPS receiver that has a standard NMEA string output through the serial port.
The GPS receiver can be set up to send one or more types of data strings. These strings are called
NMEA-0183 strings and each contains positional or other information in specific formats. Each type of
string is specified by a 5-character prefix.
Note that Sensors & Software GPR data can only be integrated
with GPS data if at least one of the NMEA strings output by the GPS are GPGGA, GPRMC or GPGLL.
These are the only strings that have the positional information required.
Figure 3-6: The GPS Setup Parameter screen.
This feature allows GPS information to be recorded while collecting GPR data. The GPS information may
be useful for mapping where GPR surveys have been performed (see Reading Every X Traces below) or
determining where a specific target of interest is located in GPS co-ordinates (see Tagging mode below).
