Abstract
This paper is introducing analyses of new design of the Automatic Identification System (AIS) ships antenna that will serve for both VHF-band Radio and Satellite tracking and identification system for maritime applications. The current AIS network is an automatic tracking system used by ships of Vessel Traffic Service (VTS) for identification and location of vessels by electronically exchanging data between nearby ships and on-shore base station. In the AIS system for the electronic data exchange, the Very High Frequency (VHF) range is used. Utilizing of the VHF range makes the AIS as short-range communication, identification and collision avoidance system between AIS equipped ships and base station is possible in the antennas Line-of-Sight (LOS). In order to widen the range of the AIS from short range up to long or global range should be used AIS communication via a satellite. In order to provide communication via satellite as well should be designed multifunctional antenna for both Radio AIS (R-AIS) and Satellite AIS (S-AIS) communication antenna. The analyses and design of a new multifunctional antenna, calculation and development, including implementation and testing of helical VHF antenna for R-AIS and S-AIS equipment are discussed.
Highlights
The Very High Frequency (VHF) Radio Automatic Identification System (AIS) (R-AIS) or Radio VHF Data Link (RVDL) is a most attractive system at present for short range tracking and detecting of ships in coastal navigation
The resonant Quadrifilar Helical Antenna (QHA) antenna can be divided into two types, open and shorted circuit at non-feed end, which main parameters for implementation onboard ships are following: ro = spiral radius; P = thread pitch; N = turns numbers; Lele = helix length; and Lax = axial length
Simple calculation with the help of the equation (8) is showing that the QHA antenna produces radiation patter with gain higher than 3 dB within confined angle of 100 and 1750, with the available values it is proved that reliable AIS is implemented
Summary
The VHF Radio AIS (R-AIS) or Radio VHF Data Link (RVDL) is a most attractive system at present for short range tracking and detecting of ships in coastal navigation. It mainly aims at avoiding collisions between ships. According to IMO regulations by 31 December 2004 each oceangoing vessel has to install AIS transponder devices onboard, which automatically broadcast regularly to the coast station ships name, call sign and navigation data. This data is programmed when the equipment is installing onboard ships and all this information is transmitted regularly. Zhang [15] described the AIS Signal using Sparse Representation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
