Thus, these modern fish finders have been used in a variety of research fields, including marine engineering (Uchida et al. In addition, the data are recordable with simultaneous positional information, so a wide range of scientific data can be collected at a relatively low cost moreover, the equipment can be used on small boats because of their small size and light weight. They provide high-quality depth measurements and high-resolution sonar images.
The performance of leisure-use fish finders has improved considerably recently. Acoustic methods have also been used for commercial and leisure fishing, whether to find fish and fish beds or to prevent ships and boats from grounding. However, using this method has historically been costly and required researchers to have special training.
It should be useful in surveying areas that have heretofore been hard to investigate, including remote, small, and shallow lakes, for example, volcanic and glacial lakes.Īcoustic investigation by sonar is a basic scientific method that has been used to measure depth and investigate geological conditions under water. The system is low cost, easy to use, and mobile. Here, we explain how the system was developed and demonstrate the use of the system in an area of submerged woods in a lake. With the developed system, an operator can direct the heading of an unmanned watercraft and monitor a PC display showing real-time positioning information through the use of onboard equipment and long-distance communication devices. Because these sonar instruments are lightweight and small, they can be used on unmanned small watercraft. Current leisure-use fish finders have strong depth sounding capabilities and can provide precise sonar images and bathymetric information.
This paper describes a remotely operated investigation system developed by combining a modern leisure-use fish finder and an unmanned watercraft to survey water bottom topography and other data related to bottom materials.
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