Fig. 2 (IMAGE) Osaka University Caption Block diagram of the ultrawide-band millimeter-wave radar mounted on the drone. The feature is that the generation of millimeter-wave signals is controlled by utilizing optical communications technologies. Control of millimeter-wave generation and processing of detected signals are performed on the ground. It can handle up to the terahertz-wave band by replacing the parts mounted on the drone. Credit Osaka University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.