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.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 l...Show More
Abstract: This paper focuses on the fading characteristics of a wireless channel of an inland waterway in an urban bridge scenario at 5.9 GHz. The measurement area was selected in Wuhan city, which lies on the middle reaches of the Yangtze River's intersection. Due to urban bridges, the fading characteristics of inland waterway channels are highly correlated with the ship motion direction or the distance between the transmitter and receiver and thus have unique properties. We demonstrated that the path loss, K-factor, power delay profile characteristics, and delay spread features significantly varied with the distance between the transmitter and receiver. Path-loss exponents were derived from the measurements and the differences between the Urban Bridge Environment and the line-of-sight was found. In bridge environments, the values of the excess delays change weakly from line-of-sight cases. The study also showed that numerical measurement results can be used to predict small-scale characteristics over any inland waterway with relatively good accuracy. These results will serve as a reference for urban waterways with bridges, as no experimental results have been reported previously.Abstract: This paper focuses on the fading characteristics of a wireless channel of an inland waterway in an urban bridge scenario at 5.9 GHz. The measurement area was selected in Wuhan city, which lies on the middle reaches of the Yangtze River's intersection. Due to urban bridges, the fading characteristics of inland waterway channels are highly correlated...Show More
