GAPS - User Guide
5.3.2 CONFIGURING A TRANSPONDER
5.3.2.1 Parameters
Interrogation
● In Responder Mode the transponder is set off by an electrical signal and responds via
acoustics. Two different responder modes (Responder Main. and Responder Sec.) can
be selected for two series of transponders. These two modes correspond to the two BNC
connectors on the rear face of the BOX. In responder mode, GAPS does not transmit any
acoustic interrogation signal.
> Position update is twice faster in responder mode because there is only one acoustic
travel. The first travel is electric. There are two acoustic travels in transponder mode.
> The transponder cannot be accidentally triggered by any parasitic sound source.
> The transponder is always triggered even in a noisy environment (ROV propellers).
> Depending on environmental conditions, the maximum range of the system is
sometimes limited by the reception of the acoustic triggering signal by the
transponder. This is no more limitation in responder mode and the maximum range is
only limited by the reception of the reply by the acoustic array.
> The drawback is that the electrical signal has to be transmitted up to the transponder
usually through an electrical or a fiber optic wire or by using synchronous clocks
(GAPS in external synchronization mode).
● In Transponder mode, the interrogation and response are transmitted via acoustics.
● Code: monochromatic signal, for all possible interrogation codes
Reply
Under Reply are the acoustic parameters that characterizes the transponder response.
● Code: defines a medium frequency MFSK signal, for all possible reply codes depending
of the transponder type.
● Turn Around Time: Inactivity period between the start of the interrogation signal
reception and the beginning of the response emission. Between 20 and 200 ms.
Additional
Information
Additional information may be:
● None: If there is no additional information to be notified, you can select a Station
Keeping option. In this case, you have to enter the position and depth with accuracy.
● External Pressure: Pressure transmitted by serial link from a pressure sensor. This
sensor might be the transponder or the vehicle pressure sensor. Input an Accuracy.
● Fixed Depth: Enter the corresponding Depth and Accuracy.
DP
See section 8 for more details dynamic positioning.
MU-GAPS-AN-005-H - November 2019 87
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