Research On Display And Control System For Deep Water Multi-Beam Bathymetric SideScan Sonar

The 21st century has been called "the century of ocean". Research on the ocean is not only the scientic need, but also the important way to solve the increasingly severe problem such as land resources shortage, population expansion growth et al. All contries in the world spare no effort in the oncean research, exploraiong, development and utilization of the ocean resources. Submarine terrain and landform information has a very important position as the basis in shipping safety, marine project, ocean research, national interests and so on. Sonar technology is the only effective means currently on the submarine bathymetry. Because of the advantage of the multi-beam sonar system like high efficiency, high precision and full coverage, The International Hydrographic Organization set the multi-beam sonary system is only method for the high precision seabed terrain detection.However the deep water multi-beam sonar system consists of numerous equipment, produces large amounts of data in real-time, and processes the data complex, the display and control system for it could not show the multi-source detecting data fast and precision in real-time.The purpose of this paper is to design and implement the first display and control system for deep water multi-beam bathymetric sidescan sonar in China, to provie the safe and friendly terminal for the sonar device control, to provide user the stable and convenient detecting data service, to provie the multi-views of the detecting data in real-time, to enhance the field processing power and data mining capabilities. The main research work includes:A sonar device control method based on the state protection and transition was proposed to achieve the safe and friendly operation; A efficient and stable real-time data acquisition method was proposed for the deep water multi-beam bathymetric sidescan sonar system mass detecting data; Some scientific data real-time expression method were proposed to show the deep water multi-beam bathymetric sidescan sonar system detecting data fast and precisely.The main innovation is as follows:(1) Aiming at the features of the deep water multi-beam bathymetric sidescan sonar system sounding data, to improve the constructin efficiency of thedynamic irregular seafloor DEM,4 methods were propsed to construct the dynamic irregular detecting seafloor terrain, to realize 3D rendering of the massive detecting seabed terrain under global frame in real-time:A. Rapid sound wave velocity correction methodB. Rapid beam footprint position calculating methodC. Rapid dynamic strip-map gridding method D. Dynamic irregular pyramid construction method(2)To improve the drawing efficiency of the backscattering image in real-time, a real-time massive side scan data strip-map updating method was proposed.(3)To improve the drawing efficiency fo the water column image in real-time, a real-time massive water column data resample method based on polar coordinate was proposed.(4)To control the sonar device safely and friendly, a sonar device control method based on the state protection and transition was proposed.(5) To improve the multi-source real-time data acquisition success rate, a real-time data acquisition method using multi-thread thchnique based on the local data cache pool was proposed.The experiment shows that this system could meet the display and control demands of deep water multi-beam bathymetric side scan sonar, could improve the safety and efficiency of the filed operation.