Engineering Issues of UAV-Based GNSS-A Observation Technology

Seafloor measurements have so far been generally carried out by manned vessels. However, this is a big bottleneck for updating observation frequency, real-time performance, mobility, and cost. Seafloor measurements using Unmanned Aerial Vehicles (UAVs) have the potential to revolutionize not only observation costs but also frequency and real-time performance. In parallel with the development of Space Entertainment Laboratory's (SELAB) takeoff- and landing-type float plane UAV HAMADORI, we are promoting the development of underwater acoustic communication using UAV and underwater seafloor geodetic observation technology using it. In this development, we are proceeding with detailed technical development to reduce the size and weight of the equipment and maintain the same accuracy as vessel observations. We are also developing for actual observation, such as attitude on the sea surface, quality assurance of acoustic communication, control on the survey line and Graphic User Interface (GUI). This article introduces one aspect of our research and development. Here, we also show some of the technical challenges.