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An analysis of Digital Selective Calling system with regard to generating false distress signals within Global Maritime Distress and Safety System

Czajkowski J.

Polish Maritime Research

2001

Vol. 8, nr 3

22-27

In this paper a mathematical analysis of the Digital Selective Calling (DSC) system is presented with regard to the occurrence probability of different errors which can cause generation of false distress signals [5,6]. In particular, the kinds of sequences were considered which - in accordance with some ITU recommendations - should indicate "distress", "urgent" and "routine" messages. The DSC system serves within the GMDSS as the only way of sending alert signals by means of terrestial communication [3,4]. However during its use at sea DSC creates many serious problems aspcially those connected with the false alert signal generation [7]. Presently this problem is being carefully monitored and analyzed under auspices of the International Maritime Organization (IMO) and International Telecommunication Union (ITU).

Final results of the research on the use of Digital Selective Calling (DSC) system at sea

Czajkowski J.

Polish Maritime Research

2000

Vol. 7, nr 2

23-25

This paper contains recults of the research on Digital Selective Calling DSC) carried out in real conditions of sea voyages during the last year of GMDSS implementation. The results make it possible to estimate a degree of DSC system usefulness in achieving its assumed functions within GMDSS.