Method of position measurement for stationary sensor node based on marine tag

In recent years, it says that the number of the coral decreases by the change in the marine ecosystem, the change of marine environment and increase of crown-of-thorns starfish. Therefore, the research and preservation of coral is necessary urgently. Then, authors have been developing the device which is called the stationary sensor node to observe underwater environment with wide range for a long term. In order to measure identical spot with the device, it is necessary to grasp its attitude data of stationary sensor node and observe the coral in the fixed position. However, it is difficult to grasp all of information by internal sensor of stationary sensor node. In this paper, we introduce a method of position measurement of marine tag which is defined as landmark on underwater image. Further, we show a method to estimate the attitude data based on position data of marine tag.