Research Of Positioning Technology Application In Port Construction

With the increasingly expanding of marine development in China, harbor constructions develop to large scale and deepwater. Offshore airports, nuclear power, iron and steel, heavy chemical and other major national projects have gathered to coastal. To meet the needs of land, large Reclamation land project offshore artificial island project emerge in Coastal cities.The increasingly Construction scale and the difficulty of technical, also set the new request to the localization technology. How to meet the new requirements of the project, quicken the positioning speed, reduce economic investment, improving the accuracy of positioning, solve the new problems of positioning encountered in the application is a hot topic today.GPS-RTK (Real Time Kinematic, real-time dynamic) technology is developed on the basis of the GPS, collect three-dimensional coordinates in real time by the rover, can achieve centimeter level in positioning in the condition of base station and rover Establish communication. GPS-RTK do not need visible, can be used in wide range of operations, easy and quickly to survey, Enhanced the operating efficiency of the lofting and the topographic survey and the control survey in reclamation construction.Analysising the principle sources of the deviation sources and accuracy of GPS positioning system, in the construction of offshore artificial island.Axis and milepost are difficult to establish on the shore, It’s difficult and cost a lot to set up a sea based measurement platform. The use of conventional measurement techniques cannot meet the needs of construction. The GPS-RTK survey methods applications in the positioning of foundation bed riprap、acceptance in bed leveling,placing caissons. Through this method can solve the above problems and will provide effective protection to the construction of large offshore harbors projects.