AIS VDL CAPACITY CALCULATOR - NUMBER OF SLOTS IN ONE MINUTE (FRAME)

This is a SIMPLE calculator which can be used in assiting the planning of an AIS coverage area. It is used in terms of our disclaimer notice.

This calculator does not take into account the dynamics of a RF environment. It only uses the AIS update rates as specified in the respective standards. Binary and safety related messages for both ships and base stations must me included in the Base Station FATDMA (slot reservation) calculation. Only Base Stations and AtoN's within direct coverage area of one another should be included for a total coverage are calculation.

This calculation includes units at anchor transmitting every 3 minutes, static and voyage releated messages transmitted every 6 minutes and AtoN and Base Station units with a transmission schedule exceeding 1 minute intervals. These transmissions are averaged out and included in the one minute time frame. As a result, values with fractions can occur.

AIS CLASS A

No.of Units

At anchor and speed less than 3 knots

 

At anchor and speed greater than 3 knots

Speed 0 to 14 knots

Changing course and speed 0 to 14 knots

 

Speed 14 to 23 knots

Changing course and speed 14 to 23 knots

Speed greater than 23 knots

Changing course and speed greater than 23 knots

AIS CLASS B/CS

Speed less than 2 knots

 

Speed greater than 2 knots

AIS SEARCH AND RESCUE

Total number of AIS S&R units

 

AIS AIDS TO NAVIGATION

No/Units    Up/Rate

NUMBER OF AtoN UNITS and respective update rates; provision has been made for a few different update rates. The update rates of Messages 6, 8 and 14 must be included in the entry made by the user. Message 21 is a 2 slot message; it is deemed in this calculation that Messages 6, 8 and 14 are 2 slot messages. The update rate (Up?rate) is the interval in minutes (1 to 60) in which the AIS AtoN is scheduled to transmit.

    
    
    
    

BASE STATIONS

   [total number of base station units]
FATDMA detail (includes messages 6,7,8,12,13,14,16,20,22)
   [number of slots in a block (1-5)] [number of blocks in frame]
DGNSS (msg17) stations included in the total number of base stations specified above:
   [number of dgnss station] [slots per transmission (1-4)] [update rate in minutes]


    
        



                                              Units       Slots      Slot%
AIS Class A Totals:          
AIS Class B/CS Totals:    
AIS S&R Totals:               
AIS AtoN Totals:              
AIS Base Station Totals:  

AIS Grand Totals:             




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