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Revisiting Enhanced AIS Detection Range under Anomalous Propagation Conditions
Version 1
: Received: 22 August 2023 / Approved: 23 August 2023 / Online: 24 August 2023 (07:11:26 CEST)
A peer-reviewed article of this Preprint also exists.
Sirkova, I. Revisiting Enhanced AIS Detection Range under Anomalous Propagation Conditions. J. Mar. Sci. Eng. 2023, 11, 1838. Sirkova, I. Revisiting Enhanced AIS Detection Range under Anomalous Propagation Conditions. J. Mar. Sci. Eng. 2023, 11, 1838.
Abstract
Two clear-air over-the-horizon propagation mechanisms affecting Automatic Identification System (AIS) detection range are considered. Comparison results are presented between the path loss due to tropospheric ducting and path loss due to tropospheric scattering (troposcatter) for the AIS frequencies. The calculations are based on the well-known parabolic equation approximation to the wave equation, in which a simple troposcatter formula is incorporated. In most studied cases the ducting assures significantly greater reduction of path loss than troposcatter even when the AIS frequencies are not well trapped in the duct. Emphasis is placed on elevated trapping layers and some features that may make ducting propagation less favorable in terms of increasing the AIS detection range are discussed.
Keywords
automatic identification system; anomalous propagation; tropospheric ducting; troposcatter; parabolic equation
Subject
Engineering, Electrical and Electronic Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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