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AIS - Automatic Identification Systems
AIS - for safety and efficiency

CNS Systems provides the international maritime community withshipborne and shore-based automatic identification system solutions (AIS),compliant with and certified to meet international standards.

Airborne AIS transponders greatly enhances surveillance of large areas. The localisation and identification of all AIS equipped vessels greatly increases national security, environmental protection, and the possibility of rescuing vessels in distress. AIS-equipped aircraft, with their high speed and extreme VHF coverage, are well suited to be used in SAR operations.

The SOTDMA technology used in the AIS transponder broadcasts and receives information about all AIS equipped vessels within VHF coverage. This information includes position, identity, course and speed over ground, heading and rate of turn as well as navigational status and the destination of the ship. The information received is easily plotted on an electronic chart display system. This gives a surveillance capability that was not possible prior to AIS. AIS information on draught, type of cargo and destination is also useful in rescue operations. The airborne AIS transponder is the result of our extensive experience of avionics, and is designed and produced to the same high demands as our VDL4000 avionic transponders.

We provide safety and efficiency at reduced operational costs.

For the crew of a ship at sea, the advantages of a reliable SOLAScompliant AIS system are essential. Robust and flexible base stations andnetwork software solutions are critical components in systems for safetyand efficiency in coastal and inland waters, and harbours. Withinnovative technology and expertise in our customers’ areas of operation,CNS provides solutions for increased safety and efficiency wherever theneed exists.

Shipborne AIS

Our shipborne AIS Class A systems, based on state of the art technology, gives SOLAS compliance at a very attractive price. Installed on a large number of vessels worldwide, they not only ensure reliable operations, but also provide the users with the features necessary to utilise the full advantages of the AIS technology.

Airborne AIS

The AIS airborne transponders developed from our avionic product line are well suited to be used in SAR operations.

AIS shore based systems

AIS shore-based systems consisting of AIS base stations and network software solutions are the perfect choice for the maritime authority building up an AIS network and for standalone operation in a VTS or port management system

Our AIS base stations

Fulfil all the requirements of relevant international AIS standards and are flexible systems that are easily configured to meet different customer requirements. Regardless of configuration – basic or dual transponder solutions for extended availability – they offer superior performance and quality at very attractive prices.

Powerful network software solutions

Make it easy to integrate a few base stations as well as a distributed larger network to a port management system or a central VTS system. The Sub-network Controller gives powerful support for handling all AIS target information received. It also filters the information and logs it in the database. The Network Manager includes support for remote monitoring, maintenance and upgrades of base station chains to ensure high availability while keeping operational costs at a minimum.

Application development

CNS Systems combines unique competence in radio technology, software development and system integration with experience from communication, navigation and surveillance applications for shipping and aviation. This is the platform for successful application developments in close cooperation with.

AIS - Shipborne

The VDL6000 Class A system provides SOLAS compliance and BSH-certification at very attractive prices.

The data link communication covering identity, position, destination and other required static, voyage-related and dynamic data gives all vessels in an area increased situational awareness and improves safety at sea for the individual ship. Positive identification and positioning of all ships in the vicinity reduce the unnecessary “ship on my port bow” calls. Less information overload greatly enhances safety at sea.

The SOTDMA technology used in the AIS transponder transmits and receives information on all vessels within VHF coverage. This information includes position, identity, course over ground, heading, and rate of turn as well as navigational status and the destination of the ship. The information received from, and provided to, the ships is easily plotted on any ARPA radar or electronic chart system. This gives the Officer of the Watch a situational awareness that could never be achieved prior to AIS. Information on draught, type of cargo and destination could also be used to make decisions related to manoeuvring. The screen presentation of the call signs of other ships enables a ship to make direct contact with conflicting vessels by text messaging or voice communication. Maximum awareness is always accomplished.

Configuration and interface

Easy to install in any ship, the VDL6000 Class A system is connected to a GPS antenna, a VHF antenna and power supply. The mandatory installation is complete after connecting it to the navigation GPS, gyro and installing the Pilot Plug interface. To maximise the benefit of the investment, the VDL6000 Class A is delivered with an interface to the chart system and/or ARPA radar. Moreover, the system is designed to support long-range reporting via satellite.

The shipborne Class A system consists of Transponder, Minimum Keyboard & Display (MKD), and Connection Unit.

GENERAL-TECHNICAL DATA
Power requirements 21.6-31.2 V DC
Environmental
IEC 60945 Protected installation
Electrical Interfaces
DGNSS correction input (RS232) RTCM-SC-104
External display (RS485) IEC 61162-2
Long-range (RS485) IEC 61162-2
Pilot/Auxiliary (RS485) IEC 61162-2
Sensor interfaces 1 to 3 (RS485) IEC 61162-1 or -2
Physical Characteristics: Transponder
Cooling Not required
Size (W x H x L) 175 x 81 x 276 mm
Weight 3.9 kg
Receiver
Number of receivers 3 (2 AIS TDMA, 1 DSC)
Channel spacing 12.5 and 25 kHz
Sensitivity, 20% MER < -107 dBm AIS for 25 kHz, < -98 dBm AIS 12.5 kHz channel
Tuning range 156.025 - 162.025 MHz
Transmitter
Baud rate 9600 bps
Carrier power (adjustable) 33 and 41 dBm (2 and 12.5W) 50Ohm load
Channel selection time < 26 ms
Channel spacing 12.5 and 25 kHz
Modulation scheme GMSK (AIS TDMA ) / GFSK (DSC)
Number of transmitters 1
Tuning range 156.025 –162.025 MHz
TX to RX turnaround time < 1 ms
GNSS Receiver
GNSS receiver 12 parallel channels
DGNSS support Yes
Certification
BSH  
Applicable Standards
IPC-A-610 (Manufacturing)  
ITU-R M.1371-1, IEC 61993-2, IEC 60945, IEC 61162-1/2
RTCA/DO 178B (SW development)
Minimun Keyboard and Display
Power requirements 24 V DC, from Connection Unit
Size (W x H x L) 120 x 180 x 45 mm
Weight 1.2 kg
Connection Unit
Power requirements 24 V DC 3 A
Size (W x H x L) 175 x 345 x 75 mm
Weight 1.1 kg
Accessories Included
Interface cables between transponder, MKD and connection unit

 

 

AIS - Shipborne-FAQ

What shall I do when I cannot connect my external GPS and/or Gyro?

To verify that the connection between the AIS equipment and the external GPS and/or Gyro is correct follow the following steps:   

1.RS232/RS485

The sensor ports (SENS1, SENS2 and SENS3) on the connection unit are RS485 ports, which can be directly connected to equipment having either RS422 or RS485 output ports.

Start with verifying that external equipment (e.g. GPS or Gyro) is using a RS422 or RS485 interface.

If the external equipment is using RS232 the general recommendation is to use a converter from RS232 to RS422/RS485. C.N.S System have tested the equipment with the following converter:

Model: 4WSD9R, RS-232 to RS-422/485 Converter

Manufacturer: B&B electronics, www.bb-elec.com

The converter has been successfully tested with both RS485 4-Wire Full-Duplex and RS422 4-Wire Full-Duplex mode.

The connection table showing connection of the converter to the connection unit:

Converter Pin # Converter Signal Connection unit signal
2 RD(A)- Tx A
3 TD(B)+ Rx B
7 RD(B)+ Tx B
8 TD(A)- Rx A

It can also be possible to connect the RS232 directly to the RS485. This is not recommended and not guaranteed to function properly. If connecting RS232 directly to the connection unit the signal levels shall not exceed +/-7V. The RS232 should be connected to A and GND on the connection unit.

It is essential to check the signal level of the RS232 interface before trying to connect it to the VDL 6000, since higher signal levels can destroy the serial receiver interface permanently. HW faults due to direct connection of RS232 equipment is NOT covered by C.N.S. Systems warranty.

Note: All three sensor ports are functionally equivalent so it is possible to test different ports for the external equipment as troubleshooting.

2.Baud rate

 When you have verified that the GPS/Gyro is connected properly continue with to verifying that the external equipment and the VDL6000 are configured with the same baud rate (normally 4800 bps) and other port settings. How to configure the Baud rate is explained in the VDL 6000 Manual, Part II –User’s Guide, chapter 5.5.8 Port settings . Please note that the system needs to be rebooted after changing the port settings.

3. Local date

Verify that the external sensor is configured to send a DTM sentence defining the local datum to WGS84. If this sentence is not received, all received position data will be neglected.

4. Electrical continuity test - Connector J2

Verify that there is an electrical connection between the screw terminals of the sensor ports in the Connection Unit and the cable connector P2 to be connected to the VDL 6000 transponder. To make sure that everything is connected properly a standard multi meter can be used to make a connection check between the following pins:

SENS1:A => P2:7  SENS1:B =>   P2:37  SENS1:GND =>  P2:22 SENS2:A => P2:24 SENS2:B => P2:8  SENS2:GND => P2:38  SENS3:A => P2:40  SENS3:B => P2:25 SENS3:GND => P2:9

5. Gyro interface

using a gyro converter from qwerty-electronics (S2N 9028C), provided as option by C.N.S. Systems, it is possible to configure it to play a pre-programmed sequence of turns. This can be useful for troubleshooting. Please refer to the gyro interface manual for details of how to configure it to play this pre-programmed sequence.

6. What is the normal behaviour of Transponder LEDs?

The transponder has six (6) LEDs (Power, Alarm, Tx, Rx1, Rx2, Rx3) on the front side of the transponder. When powering up a VDL6000 Class A system without any external sensors (e.g. GPS and Gyro) (see note) connected the normal behaviour of the LEDs are:

The green power LED will flash a couple of times and then light continuously. After approximately 2 minutes the alarm LED will light up if there is no external sensors connected. If the LEDs do not behave like this please contact the technical support.

Note: In early SW versions (up to SW-6000-10-1.5.1) there was a bug related to the alarm regarding a lack of Heading information (normally coming from the gyro). If this information was missing at power on of the transponder, no alarm was generated. The alarm only came if Heading information had once been received, and suddenly disappeared. This was corrected from SW release SW-6000-10-1.6.

AIS - Airborne

Search and Rescue (SAR) AIS transponders for aircraft installation.

Airborne AIS transponders greatly enhances surveillance of large areas. The localisation and identification of all AIS equipped vessels greatly increases national security, environmental protection, and the possibility of rescuing vessels in distress. AIS-equipped aircraft, with their high speed and extreme VHF coverage, are well suited to be used in SAR operations.

The SOTDMA technology used in the AIS transponder broadcasts and receives information about all AIS equipped vessels within VHF coverage. This information includes position, identity, course and speed over ground, heading and rate of turn as well as navigational status and the destination of the ship. The information received is easily plotted on an electronic chart display system. This gives a surveillance capability that was not possible prior to AIS. AIS information on draught, type of cargo and destination is also useful in rescue operations. The airborne AIS transponder is the result of our extensive experience of avionics, and is designed and produced to the same high demands as our VDL4000 avionic transponders.

Configuration and interface

The airborne AIS transponder, with its internal GPS, connects to power supply, VHF and GPS antennas and to a laptop with our confi guration software. The same laptop or a CDTI can also be running an electronic chart system to display targets received by the airborne AIS transponde

Technical Data

GENERAL-TECHNICAL DATA
Power requirements 21.6-31.2 V DC
Environmental
IEC 60945 Protected installation
Electrical Interfaces
DGNSS correction input (RS232) RTCM-SC-104
External display (RS485) IEC 61162-2
Long-range (RS485) IEC 61162-2
Pilot/Auxiliary (RS485) IEC 61162-2
Sensor interfaces 1 to 3 (RS485) IEC 61162-1 or -2
Physical Characteristics: Transponder
Cooling Not required
Size (W x H x L) 175 x 81 x 276 mm
Weight 3.9 kg
Receiver
Number of receivers 3 (2 AIS TDMA, 1 DSC)
Channel spacing 12.5 and 25 kHz
Sensitivity, 20% MER < -107 dBm AIS for 25 kHz, < -98 dBm AIS 12.5 kHz channel
Tuning range 156.025 - 162.025 MHz
Transmitter
Baud rate 9600 bps
Carrier power (adjustable) 33 and 41 dBm (2 and 12.5W) 50Ohm load
Channel selection time < 26 ms
Channel spacing 12.5 and 25 kHz
Modulation scheme GMSK (AIS TDMA ) / GFSK (DSC)
Number of transmitters 1
Tuning range 156.025 –162.025 MHz
TX to RX turnaround time < 1 ms
GNSS Receiver
GNSS receiver 12 parallel channels
DGNSS support Yes
Certification
BSH  
Applicable Standards
IPC-A-610 (Manufacturing)  
ITU-R M.1371-1, IEC 61993-2, IEC 60945, IEC 61162-1/2
RTCA/DO 178B (SW development)
Minimun Keyboard and Display
Power requirements 24 V DC, from Connection Unit
Size (W x H x L) 120 x 180 x 45 mm
Weight 1.2 kg
Connection Unit
Power requirements 24 V DC 3 A
Size (W x H x L) 175 x 345 x 75 mm
Weight 1.1 kg
Accessories Included
Interface cables between transponder, MKD and connection unit

 

 

 
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