The Design And Application Of The Space-base AIS Simulation Signalsource System

With the economic globalization and the continuous development of marine technology,the marine transportation develops rapidly.The space-based AIS system is proposed to improve marine traffic security and implement marine rescues.Space-based AIS technology in China has a large gap between foreign countries such as Norway,Germany,the United States and other countries.At present,there is a lack of space-based AIS(Automatic Identification System)signal and the foreign AIS data is expensive and limited in quantity.Therefore,it is imperative to study the space-based AIS simulation signal source.Based on Recommendation ITU-R M.1371-5 developed by the International Telecommunication Union,the signal simulated by the space-based AIS simulation source can not only provide true and valid AIS data for the space-based AIS receiving system,but also analysis the key problem of the space-based AIS system-collisions.The simulation source system is designed in this paper.Based on the simulation source,the power distribution and collision problems of AIS signals is analyzed and the signal of AIS is applied by AIS receiving system to verify the performance.Finally the visual simulation of space-based AIS platform is designed in this paper.Firstly,the research background and significance of space-based AIS are introduced in detail.This paper gives a brief introduction of the satellite-based AIS system,as long as the composition and significance of the space-based AIS simulation source.This paper also puts forward the problems existed in the system and proposes the solution.Then,Based on Recommendation ITU-R M.1371-5,the space-based AIS simulation source framework is designed and design and implement the ship distribution module,time slot allocation module,modulation module,channel parameter module and signal combination module in the simulation source.Next,the collision analysis of different types of simulation signals provides an important basis of the receiving system.The space-based AIS simulation signal is applied to the receiving system to analyze the demodulation performance under different conditions of the source signal.The database framework of the space-based AIS system visualization platform is designed,which is essential for the visualization platform of the AIS system.Finally,this paper summarizes the main contents of the thesis research and illustrates the contents of further research,which provide an effective basis of follow-up study.