Tianjin Area VHF Ship Communication Chain Network System

The VHF (Very High Frequency) is the frequency in30-300MHz radio waves of thewavelength within the range of10-1M，it’s an important communicationchannel fornavigation and air traffic management. With the continued growth of internationaltrade and China’s reform of opening up is process of the deepening, China’s maritimetrade also show an extremely prosperous development trend. With the improvement ofport capacity and increasing the number of ships, ship communications businesscontinue growing, involving of ships in distress accidents also show an increased yearafter year. VHF chain network construction can meet the coastal ship、 portcommunication needs, and also greatly assist the safe navigation of ships and distressrelief.This article describes the design, construction and application of the Tianjin areaship communication chain network system, This article is to start from the needsanalysis, the status quo for the area of communication, system design, key equipmentselection, hardware installation debugging, software functional design is described indetail. Combined with the system self-test and onboard communications test data tosupport the practical effects of the system were evaluated and made recommendationsfor the construction of future coastal system.The Tianjin area VHF marine communication chain network system has beencompleted and put into use, to achieve the desired design effect. System applicationsto effectively expand the existing VHF communications coverage, consolidate VHFdistress search and rescue capabilities of the Bohai Sea, The Application ServiceCommand and Control ship in the port of Tianjin,Huanghua and CaoFeidian, toensure the safety of navigation and serve the local economy of the Bohai Sea has apositive meaning.