Application Research Of Underwater Measurement Technology For Unmanned Ships

With the acceleration of national infrastructure construction and marine strategy,the accuracy and timeliness of surveying and mapping of coastal beaches and seabed topography and surveying and monitoring of land and underwater topography have become increasingly demanding,and the accuracy and rapidity of underwater topography has become a key link that restricts the construction speed of water conservancy projects.The traditional underwater survey usual y uses a manually operated ship to measure the positioning and depth separately.The accuracy of the survey results is not high and the safety is also affected to a certain extent.Therefore,unmanned ship survey technology has developed rapidly in recent years.Based on the analysis of the development of underwater survey and unmanned survey vessel,this paper introduces the data acquisition and data processing methods of unmanned survey vessel,compares the processed data collected in Ganjiang River with the traditional underwater survey elevation data,and shows the rationality,reliability and practicability of unmanned survey.And the safety of underwater survey has been greatly improved after unmanned ship survey.At the same time,the unmanned ship developed and produced by Shenzhen Qianhaixin Dazhou Science and Technology Co.,Ltd.was used to collect the data of a certain reservoir,and MATLAB fitting interpolation method was used to compare the water depth data of the two surveys to prove the accuracy of the survey.The average value of the two surveys was taken as the value used to process the underwater terrain data obtained after the processing through CASS software to generate the terrain map,thus improving the accuracy of the unmanned ship in surveying and mapping the underwater terrain map.Finally,based on Xindazhou underwater survey shore-based software,the section thinning algorithm is used and the program is developed for the second time to simplify the section without losing the section feature points,thus improving the efficiency of underwater section drawing and making the drawing simple and efficient.The innovation of this paper is the section thinning algorithm,which uses Douglas-Puck thinning algorithm,uses Visual Studio to program the algorithm,and then embeds it into the shore-based software program.Complete section thinning operation,reduce many unnecessary redundant points,improve section drawing efficiency and reduce drawing time.