Page 35 of 77
SKIPPER Electronics AS
Edition: 2017-06-12
GDS102 Operation and Installation Manual
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Chapter: 2 Operation
Simulator
The GDS102 contains a built in simulator to test the screen and various interface signals. The simulator
can be switched on and o on screen 11. When the simulator is operating, “Demo” will ash in the upper
part of the screen. See “Fig. 2.12. Screen 11. System status screen.” on page 24.
Status Screen
The status screen, screen 11, shows a list of various system parameters useful for documenting the
system setup and system operating status. The contents of this screen will provide valuable information
in situations where manufacturer support is required. See “Fig. 2.12. Screen 11. System status screen.”
on page 24.
Oscilloscope Screen
The oscilloscope screen, screen12, is useful when monitoring transceiver performance. The oscillogram
shows the signal returned from the transceiver plotted against time and will enable service personnel to
evaluate system performance and facilitate any troubleshooting. See “Fig. 2.13. Screen 12. Oscilloscope
screen.” on page 25.
Nonvolatile Parameter Memory.
The system contains non-volatile memory to maintain installation and user parameters like gain, power,
unit of measurement selection, backlight settings, etc. These parameters are kept in the battery backup
memory and are automatically restored on power-up. If the user parameters have never been set, default
values are used. Make sure that jumper JP200 on the I/O board, which activates the battery operation, is
installed in correct position. See “Fig. 3.7. Back-up battery jumper JP200, on I/O board.” on page 44.
Data type
The GDS102 software has a function where the prole data can be saved onto the compact ash disk
used for programming. If the user has problems with the system detecting the bottom even though it is
clearly visible on screen, these les can be sent to SKIPPER for analysis.
Basic Algorithm Considerations
Bottom detection
GDS102 employ a bottom detection algorithm that will try to extract the bottom signal from all kinds of
noise and secondary echoes. When GDS102 is tracking the bottom normally, a thick black line is shown.
If the software can not detect bottom within several pulses, the bottom line disappears and a warning
beep is heard. Dots are then displayed in the digital indicator window instead.
Ping to Ping ltering
Part of the bottom detection algorithm is the ping to ping ltering. The next bottom is searched for
in a time and strength window based on the strength and timing of the previous bottom echoes. This
procedure reduces the probability of tracking schools of sh or secondary echoes as bottom. If no bottom
is detected in the calculated window, the window is gradually increased in size until the full time and
strength window is used.
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