GAPS - User Guide
5 Setting GAPS to Work
This chapter concerns the actions and procedures to be carried out just before starting
positioning operations. These actions are as follows:
● Definition of the tracking parameters, see section 5.1
● Configuration of transponders (USBL and L/USBL modes), see section 5.3
● Measurement and input of profile celerity of sound, see section 5.2
5.1 Defining the Tracking Parameters
5.1.1 SYNCHRONIZATION MODES
The acoustic cycle of GAPS is defined as follows. The main parameter is the
Synchronization Mode:
● Internal Synchronization : Interrogation time for the transponder is automatically
determined by GAPS. Internal recurrence is fixed. It is configured to a fixed value.
● External Synchronization: An external system sends a trigger to GAPS.
● External Synchronization with inhibition: GAPS minimum recurrence inhibits the
short external recurrence after a received trigger. GAPS triggered on signal rising edge as
shown below.
The configuration of positioning parameters is carried out in the TRACKING component from
the menu SETUP.
74 MU-GAPS-AN-005-H - November 2019
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