Assessment of electromagnetic compatibility at the shore facility of the A2 sea area of the GMDSS

V. V. Gromozdin¹, V. V. Karetnikov², V. I. Kovalenko³, S. V. Rudykh²

¹Sevastopol State University.
²Admiral S.O. Makarov State University of Maritime and Inland Shipping.
³Branch of the Telecom Research Center in Sevastopol.

DOI 10.24412/2410-9916-2026-2-218-237

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Abstract

Purpose. Increasing shipping activity in coastal sea areas requires highly reliable reception and transmission of distress, safety, and urgency messages via ship-to-shore and shore-to-ship radio links in the A2 area of the Global Maritime Distress and Safety System (GMDSS). This requires adequate electromagnetic compatibility between the radio equipment installed both onboard the vessel and the shore-based communications facility. The objective of this paper is to examine an example of implementing a methodology for assessing the electromagnetic compatibility (EMC) of a shore station in GMDSS sea area A2 through full-scale testing, measuring the actual sensitivity of radio receivers with their transmitting units (TRSUs) on and off. The methods used to determine the median value of the additional component of the noise figure caused by insufficient EMC are based on the results of in-kind measurements of the actual sensitivity of radio receivers with the transmitters on and off. Novelty: The novelty of the presented solution lies in the results of testing the proposed experimental and computational methodology for determining the statistical parameters of the interference component, determined by the influence of nearby transponders, for assessing EMC during in-kind tests of GMDSS MR A2 shore-based facilities. Result: An experimental and computational method for determining the median noise figure, its standard deviation, and the upper decile of the distribution for the additional noise figure component caused by the influence of nearby transponders with insufficient EMC support enables the determination of shore-to-ship/ship-to-shore radio link communication ranges for GMDSS coastal facilities at the maximum noise figure, taking into account its seasonal and daily variations and the additional component caused by interference from nearby transponders. Practical significance: The proposed assessment method, given certain quantitative differences, enables the EMC assessment of GMDSS coastal facilities, including in the case of replacing existing analog GMDSS communication systems with digital ones.

Key words

maritime radio communication, sea area, medium frequencies (MF), signal-to-noise ratio, field strength, receiving sensitivity, telephony, digital selective calling, noise figure, integral distribution function, electromagnetic compatibility.

Reference for citation

Gromozdin V. V., Karetnikov V. V., Kovalenko V. I., Rudykh S. V. Assessment of electromagnetic compatibility at the shore facility of the A2 sea area of the GMDSS. Systems of Control, Communication and Security, 2026, no. 2, pp. 218-237. DOI: 10.24412/2410-9916-2026-2-218-237 (in Russian).

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