Zeni Lite Buoy Co. Ltd. 4180026 ユーザーズマニュアル
Introduction
Page 6
3.2 System overview
This AIS AtoN is a self contained device supporting both Type 1 (transmit only) and Type 3 (transmit and
receive) operation. It is designed for installation in exposed locations on physical AtoN structures. The AIS
AtoN can be supplied with an optional sensor interface platform which interfaces to sensors (such as weather
instruments) and transmits measured data via AIS messages to surrounding vessels and shore stations.
The AIS AtoN has an exceptionally low power consumption making it suitable for installation on floating Aids
to Navigation with solar charged power systems. The lowest power consumption is achieved when operating
as a Type 1 AIS AtoN transmitting only position information. Further description of Type 1 and Type 3 operation
is provided below.
receive) operation. It is designed for installation in exposed locations on physical AtoN structures. The AIS
AtoN can be supplied with an optional sensor interface platform which interfaces to sensors (such as weather
instruments) and transmits measured data via AIS messages to surrounding vessels and shore stations.
The AIS AtoN has an exceptionally low power consumption making it suitable for installation on floating Aids
to Navigation with solar charged power systems. The lowest power consumption is achieved when operating
as a Type 1 AIS AtoN transmitting only position information. Further description of Type 1 and Type 3 operation
is provided below.
Figure 2
Typical AIS AtoN system
3.2.1
Type 1 AIS AtoN
A Type 1 AIS AtoN is a transmit only device using the FATDMA (Fixed Access Time Division Multiple Access)
access scheme. This requires that the AIS AtoN is configured with fixed AIS time slots in which it will transmit
AIS messages. Mobile AIS stations operating in the area where a Type 1 AIS AtoN is installed need to be aware
of the time slots allocated to the AIS AtoN. The slots allocated to the AIS AtoN are 'reserved' by AIS Base
Station transmissions covering the area in which the AIS AtoN is installed.
This mode of operation therefore requires that an AIS base station is operating in the same area as the AIS
AtoN and is configured to make the necessary slot reservations.
access scheme. This requires that the AIS AtoN is configured with fixed AIS time slots in which it will transmit
AIS messages. Mobile AIS stations operating in the area where a Type 1 AIS AtoN is installed need to be aware
of the time slots allocated to the AIS AtoN. The slots allocated to the AIS AtoN are 'reserved' by AIS Base
Station transmissions covering the area in which the AIS AtoN is installed.
This mode of operation therefore requires that an AIS base station is operating in the same area as the AIS
AtoN and is configured to make the necessary slot reservations.
3.2.2
Type 3 AIS AtoN
A Type 3 AIS AtoN has transmit and receive capability and can therefore use either the FATDMA or RATDMA
(Random Access Time Division Multiple Access) access schemes. The RATDMA scheme allows the AIS AtoN
to internally allocate slots for transmission of AIS messages without reservation from an AIS Base Station.
AIS receive capability also allows a Type 3 AIS AtoN to be configured and queried for status via AIS messages
sent from a shore station (known as VDL configuration). An extension of VDL configuration is 'Chaining' where
configuration and query commands are passed along a 'chain' of AIS AtoN stations to a distant station beyond
the range of direct communication with a shore station.
(Random Access Time Division Multiple Access) access schemes. The RATDMA scheme allows the AIS AtoN
to internally allocate slots for transmission of AIS messages without reservation from an AIS Base Station.
AIS receive capability also allows a Type 3 AIS AtoN to be configured and queried for status via AIS messages
sent from a shore station (known as VDL configuration). An extension of VDL configuration is 'Chaining' where
configuration and query commands are passed along a 'chain' of AIS AtoN stations to a distant station beyond
the range of direct communication with a shore station.