GAPS
-
User Guide
1.2.6
O
PTIONAL
I
NTEGRATED
DGPS
The optional integrated DGPS antenna is compatible with SBAS signals. The MMP26C-
2212S1 connector is IP 67 (resists to immersion at 1 meter during 30 minutes).
Figure 6 - Optional Integrated DGPS
1.2.7
USBL T
ELEMETRY
GAPS communicates via USBL telemetry with specific transponders (ITS beacons equipped
with the specific technology, contact iXblue for more details). Data sets are transmitted both
ways in a synchronized way with the acoustic positioning cycles.
Telemetry is carried by the acoustic signals of the ITS beacons.:
●
Interrogation signals MF CHORUS CIS and MF CHORUS IIS
●
Reply signals MF CHORUS CRS and MF CHORUS IRS
Typically, the transponder transmits the measurements of its sensors (depth, sound velocity,
etc.) in order to improve the accuracy of the GAPS USBL positioning.
GAPS transmits orders to the transponder (release, etc.) via the telemetry.
Configuration of the telemetry in input and output is described in section 4.4.1.5
The telemetry datagram uses ITS TELEMETRY (NMEA 183 / $PTLMT) protocol datagram
that is described in appendix H.3.
1.2.8
P
ING
S
TACKING
The ping stacking mode consists of increasing the positioning rate independently of the slant
range between the USBL antenna and the transponder. The GAPS pings at a faster rate than
usual and does not wait for the detection of the transponder before pinging again.
See section 5.1.5 for a complete description of the ping stacking mode.
1.2.9
O
PTIONAL
H
I
S
YS
H
OISTING
S
YSTEM
The GAPS acoustic antenna may be fastened to an iXblue HiSys hoisting system. A
connection between the hoisting system and the GAPS BOX allows the monitoring of the
actual operating states of the hoisting system directly on the Web-based User Interface.
Please refer to HiSys specific user guide for complete operational procedure.
MU-GAPS-AN-005-H - November 2019
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