Wireless Channel Measurement, Modeling And Characteristics Analysis For Inland Waterway Transportation

Wireless communication system is essential technical support for inland waterway intelligent transportation in future.Experimental results show that inland waterway transportation wireless communication can effectively facilitate the interactive development of inland waterway transportation,land transportation,and navigable waterway security.The measurement and modeling of wireless channels offer several important insights and solutions for inland waterway wireless communication network planning and engineering implementation.Wireless channel research is the basis of wireless communication system design.Recently,a considerable amount of literature has been generated by wireless channel research of different scenarios.However,there are distinct differences between the wireless communication environment in the inland waterway transportation and the land transportation.There exists the specificity such as the hybrid of waterway and land transportation.Therefore,measurement,modeling and characteristics analysis of wireless channel are able to reveal the embedded characteristics in the inland waterway transportation.This study will be of great significance to construct the communication support system in inland intelligent waterway transportation.By reviewing domestic and foreign literatures on this topic and measuring actual wireless channels in inland waterway transportation,we studied and analyzed the wireless channel propagation characteristics of various typical inland navigation scenarios based on this dissertation.A correlative model for wireless channels is then established.The relevant results of wireless communication network research can be applied to intelligent waterway in future.The main research and innovations of this dissertation are as follows:(1)Based on the propagation characteristics of wireless channels and the environmental characteristics of inland waterway,and the study of the radio wave coverage and characteristics of waterway transportation,a criterion and division methodologies for wireless propagation in inland waterway are presented.This lays a foundation of ship-ship-inland shoreline wireless channel models and channel characteristics in different inland waterway transportation scenarios.Moreover,on the basis of wireless propagation scene partitioning for inland waterway,the research analyzed the channel measurement system for wireless channel propagation in inland waterway transportation as well as the wireless signal data extraction and processing.(2)According to ship-ship wireless channel measurement data from different inland waterway transportation scenarios,an inland waterway surface loss model based on the curvature of the earth is proposed.The large-scale fading-characteristics study is based on different navigation scenarios.Meanwhile,root-mean-square error and other algorithms are used to verify the effectiveness of the inland waterway surface loss model.Introductions to inland waterway surface loss model tend to be relatively comprehensive compared to the traditional model of the inland waterway wireless signal transmission characteristics especially with emphatic about the reflection of the waterway surface and the characteristics of ship-ship transportation.Moreover,this dissertation also analysis the influence of ship shaking on the large-scale fading of wireless channel propagation when the ship is berthing through the actual measurement data.(3)In view of the channel measurement results for different inland waterway transportation scenarios,the small-scale fading characteristics of the wireless channel of different ship-ship transportation scenarios are studied.Drawing on a method for analyzing the small-scale fading characteristics,the thesis puts forward the different ways of researching wireless channel propagation in inland waterway transportation.In analysis of wireless channels,it was found that different types of waterway transportation have different impacts on small-scale fading characteristics.Moreover,based on the Akaike Information Criterion,the optimized small-scale fading distribution in different scenarios is obtained.The analyzes about K-factor of Rician distribution study by this article reached different conclusions,finding inconformity with traditional model in land transportation.In addition,according to the measured data,the article analyzes the multipath delay characteristics of the wireless channel.These findings contribute in several ways to our understanding of key technologies,system applications and provide a basis for inland waterway wireless transportation communication.(4)Considering the influence of many bridge obstacles in inland waterway,this dissertation discusses the improvement method of the wireless channel propagation model for bridges of different shaded areas in inland waterway.Based on the deterministic modeling method and the idea of segmented architecture,a segmented wireless channel propagation model of an inland waterway bridge is proposed.The segmented modeling method can reflect actual ship-ship wireless channel characteristics in different regions.Analyze the line of Sight(LOS)and Non-LOS situation switching about the wireless channel propagation under the shadow effect of the bridge.Research on wireless channel multipath fading based on internal reflections of bridge obstacle and actual navigation condition of ship.