Ocean observations and research need a research vessel. Modern study of ocean exploration began the Challenger expedition(1872- 1876) by the United Kingdom in the 19th century. Korea's ocean observations and research of the history were conducted in J...
Ocean observations and research need a research vessel. Modern study of ocean exploration began the Challenger expedition(1872- 1876) by the United Kingdom in the 19th century. Korea's ocean observations and research of the history were conducted in June 1915. After the Challenger expedition, the expedition is more organized and precise exploration. The functionality of the research vessel has a very diverse and modernization of the equipment. Thus, exploration technology has been many changes.[1]
Oceanography is consist of physics, biology, chemistry, geology and other related studies. The ocean research vessels called observation ship, exploration ship, or survey ship. It's divided purpose into meteorological research vessel, geological survey ships, fisheries survey ships, icebreaker(polar research vessel), etc. Began to increase the need for offshore development since the 1960s, multi-purpose research vessel has been designed and built by carry out a number of roles. Some of these roles can be combined into a single vessel, others require a dedicated vessel.[2]
Four basic research vessel classes are identified: Specialty, Global, Intermediate Ocean, Regional and Local. Depending on the size of its purpose and goals, In case of Korea, The Korea Ocean Research and Development Institute(KORDI) is operated the Araon(7,487t- specialty), Onnuri(1,422t-Global), Eardo(536t-Intermediate), Jangmok (40t-regional) and the others are operated several kind of vessels.[3]
Basic of marine research is measure the depths of the sea, John Murray measured depth of sea by falling weights in 1888. Echo sounding of the technique for depth measuring using sound pulses has been attempted in the 1920s, using the satellite measurements began only recently years.
Normally, when install one of ocean research equipment in small vessels or small research vessels, to reduce the error of position and motion, GPS & motion sensors are installed near the ocean research equipment. However, many research equipment installed at various locations in the multi-purpose research vessel, position & motion error is encountered. The error that the difference in distance between GPS & motion sensor and research equipment.
In this thesis, the study to understand the characteristics of marine equipment at multi-purpose research vessel, analyze the cause and affect that difference of depth between position and motion on vessel by the comparison analysis of using multibeam echo sounder. In order to understand the position and motion that the coordinate of system of the research vessel were analyzed, to analysis of the position error of GPS using Qinsy 8.0 Software. According to the depth of features with echo sounder & multibeam echo sounder that can lead to errors caused by the equipment specifications were analyzed, to measure the exact distance inter-equipment of the ship using image processing and CAD software was measured. Intrinsic error of GPS equipment were calculate after enter the distance measured by CAD and image processing to GPS equipment. The error of distance at data between echo sounder and multibeam echo sounder were measured by software calibration. Calibration results were analyzed by standard deviation. By entering the actual measured distance to the echo sounder in the survey were validated by comparison with software compensation. To improve the depth accuracy and apply analysis method to other ocean research equipment will improve.
Paper is organized as follows. Chapter Ⅱ. Comprehensive multi-purpose research vessel and an introduction to ocean research equipment, Chapter Ⅲ. Position and motion theory of vessel and equipment used in the study, Chapter Ⅳ. The incidence and cause of the error depth, for the analysis plan, positioning accuracy analysis, data processing, calculation of the error, Chapter Ⅴ. The results after error compensation depth, motion sensor, gridding, and improve the direction of the other equipment of research vessel, Chapter Ⅵ. Conclusions and future research directions are discussed.