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5.4 Comparison of Systems

For comparison purposes, some relevant information about the three types of "Transponder" systems are included in Table 2 (operational aspects) and Table 3 (technical aspects).

　

It is obvious from the quoted parameters that the STDMA "Transponder" due to its signifcantly higher capacity is superior in performance and can be used as a powerful multi-purpose tool able to fulfill the requirements of both ship-to-ship and ship-to-shore use. At the time being, the DSC transponder is easier to achieve - however with limited operational functions. Both are in severe competion concerning international carriage requirements, whereas mobile transponders are limited to local / regional use.

　

　

Table 2 Comparison of "Transponder" Systems - Operational Aspects

Characteristics

DSC
("2S ?")

STDMA
("4S")

Mobile
(LOPOS)

Original Purpose

Shipping
Ship-Shore(VTS)

Aviation: Identif.
Shipping: Ship-Ship
+ Ship-Shore

Shipping Pilot Support

Mode of Operation

Polling / Interrogation
Cyclic Report

Broadcast

Broadcast

Navigation Data

Limited

Comprehensive

Comprehensive

System Capacity
(Ship*Update Rate)

max 160/min
(only if 9600 bit/s)

2000/min

-

Users

Carriage Requirement

Carriage
Requirement

Closed User
Group

On-board Equipm.

GMDSS(modif.).

New

None

Costs (Equipment
without DGPS)

4500 DM
(SW-Modification)

5000 DM

0

Availability

1995

Test Applicat. 1995

1995

Operational
Benefits

DSC - Integration

High TrafficDensity
Compreh. Data
High Actuality
Sea - Air (SAR)

- No on-Board
Installation

Other Advantages

Earlier Avaliability
No Property Rights

 　

- Commercial
Hardware

　

　

　

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