Kongsberg K-Sync, Руководство оператора, Страница: 51 / 62

OPERATIONAL PROCEDURES
Once all echo sounders have been set up, it is recommended to add all echo sounders to
one group and start with all echo sounders disabled. Then enable one additional echo
sounder at a time. Try each out and see how the echo sounders impact each other by
examining the data from the active echo sounders.
Special trigger settings
The Synchronizing Unit has two settings which optimize the scheduling in specific
circumstances.
Maximize pinging:
Echo sounders have ping cycles of different duration and sometimes
they can differ widely. Data density can be increased for echo sounders in a group by
allowing echo sounders that have short ping cycles to ping multiple times while waiting
for the slower ones to finish. If enabled, the echo sounder will be triggered repeatedly
until the last echo sounder finishes in a group. An echo sounder will not be triggered
again if it means the duration of the group would be extended.
Note
Maximize pinging mode is not suitable for echo sounders that have unpredictable active
periods from one ping to the next. The maximize pinging feature assumes that the next
ping cycle will take the same amount of time as the previous one.
Figure 39 Trigger display for EA 600 and OS 38
Trigger display showing EA 600 (top) configured to maximize pinging. The EA 600 is
able to ping multiple times while the OS 38 (bottom) is performing a single ping.
Echo sounder is master (pre-triggering): In most cases, echo sounders transmit the
instant they are triggered. With some echo sounders there is a significant ping latency
(such as more than 50 ms). It is preferable that all echo sounders in the same group
transmit as close as possible to minimize acoustic interference (especially if water
column data is collected). The master setting allows the echo sounder with significant
ping latency to be triggered first and once it starts transmitting, the other echo sounders
in group are then triggered immediately. A requirement for this feature to work is that
the echo sounder designated as master provides a transmitting signal that notifies when
transmit occurred. Also, it is required that the master echo sounder transmits within 512
ms of trigger, otherwise it will still timeout.
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