GAPS - User Guide
5.1.5.2 Procedure
1. Go to SETUP>TRACKING.
2. In Ping Stacking, set the switch button to ON.
3. Enter a ping stacking Recurrence (internal synchro mode) or Inhibition (external synchro
mode) in the corresponding field.
4. Click on OK to validate the ping stacking parameters.
5. Click on Start Tracking.
The discovery mode starts with its two recurrences.
The ping stacking mode starts only if all transponders that are set "in use" are consecutively
detected twice or that the second averaged travel time is within the tracking window.
If no transponder is detected during ten consecutive recurrences, the USBL switches to
discovery mode.
5.1.5.3 Ping Stacking Limitations
Multi
transponders
The ping stacking mode operates with limited number of transponders and every transponder
must have a specific answering code (even with specific interrogation code).
Telemetry
Telemetry may be active with the ping stacking. The processing time of the telemetry is 2 s.
The choice of wished ping stacking recurrence must take into account this telemetry
processing time.
External
synchro
The use of an external synchronization signal is possible during ping stacking. The rate of the
external synchro must match the wished rate of the ping stacking. The discovery mode is
necessary: during the first recurrences, the USBL inhibits the external synchro on the base of
the main recurrence in order to maintain the discovery mode and to secure the tracking of the
answer signal.
Recurrence
edition
Editing the recurrence in order to avoid deaf periods is not possible, teh answer signal of the
transponder can arrive during the deaf period of teh USBLsystem and then there is no
detection of the transponder.
MU-GAPS-AN-005-H - November 2019 79
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