Saab R4-AIS - Sensor Interfaces

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Document id: 7000 108-011 A2
2.16.3 Sensor interfaces
The R4 Transponder unit has three interfaces (meeting IEC 61162-1
and 61162-2) for position, bottom track (BT) speed, heading and rate
of turn (ROT) sensors.
In general, sensors installed in compliance with other carriage
requirements of SOLAS Chapter V should be connected to the AIS.
Although the fact that AIS comes on board does NOT establish a
need to install additional sensors above carriage requirements.
The sensor information transmitted by the R4-AIS Shipborne Class
A Transponder System should be the same information being used
for navigation of the ship.
2.16.3.1 Sensor input data and formats
The three sensor ports support data sentences input from various
types of ship sensors. The input data and format are shown in Table
2-4. Details of each sentence can be found in Ref. [3].
Additional information is given in Appendix [A.2] – Interpretation
of IEC 61162-1 sentences.
Table 2-4. Sensor input data and formats
Sensor Data IEC 61162-1 sentences
GNSS Positioning system:
- Time of position
- Latitude / Longitude
- Accuracy [and integrity status]
Course Over Ground (COG)
Speed Over Ground (SOG)
RAIM indicator
DTM, GBS, GGA, GLL, GNS, GSA,
GSV, HDT, RMC, ROT, VBW,
VTG, ZDA
Log Course Over Ground (COG)
Speed Over Ground (SOG)
VBW
Gyro Heading
Rate Of Turn (ROT)
HDT, ROT
Rate-of-Turn
Indicator
Rate Of Turn (ROT) ROT
2.16.3.2 Position (GGA, GLL, GNS, RMC, DTM etc.)
GNSS position sensors normally have IEC 61162 outputs suitable for
directly interfacing the R4 Transponder. However, it is important to
note the following:
• The Geodetic Datum of the position data transmitted by the
sensor shall be WGS84 and the IEC 61162 DTM sentence
should be configured.
• R4-AIS Shipborne Class A Transponder System is able to
process two reference points for its antenna position, one for
external and one for an internal sensor. Each antenna’s reference
point needs to be input to the AIS via the R4 Display (see
section 2.8.5). The R4-AIS Transponder automatically selects