Cross-Medium Communication Combining Acoustic Wave and Millimeter Wave: Anechoic Pool, Lake, Swimming Pool Experiments

A cross-medium communication can be accomplished by using acoustic waves to induce vibrations on the water surface, which can then be detected by airborne radars. Using this method, it is possible to communicate without relay between underwater and air-borne devices, which sheds the light on a wide variety of potential applications. However, few theoretical and experimental studies on it are found. Since 2019, we have developed theoretical studies on this topic and conducted experiments in lakes, swimming pools, and anechoic pools. Further, we investigated the impact of various factors on communication from our experimental results. These factors included: the frequency, bandwidth, and modulation of the communication signals, the number and depth of underwater sources, the location and height of the radar, and water surface waves in the surrounding environment. In this paper, we describe the experimental system and based on the experimental results, analyze the impacts of the above factors on cross-medium communication. All of these studies are expected to lay a basis for future cross-medium communication applications.