A model for predicting the attenuation of AIS signal at mountainous waterway
Xinglong Liu, Xiumin Chu, Wuxiong Xu, Wei He · 2016
The AIS, Automatic Identification System, is a communication system designed for exchanging information between vessels. While analyzing the reliability of the data link of AIS, it is quite important to known the distribution of field strength of AIS signal. However, empirical models designed for predicting the median attenuation of AIS signal only effective at sea and coastal waterway. As the AIS is introduced to mountainous waterway, the environmental conditions are extremely different from the sea, hence the pre-existing empirical models are no longer competent. To address this problem, we designed experiments conducted at mountainous waterway, to explore the practical attenuation of AIS signal. Then, based on the experimental data, correlation between the attenuation and the transmitting distance of AIS signal was figured out. Consequently, with the correlations, it is possible to develop a new model by curve fitting. Field experiment shows that the proposed model is capable of predicting the median attenuation of AIS more accurately at mountainous waterway than pre-existing models.