Inside Unmanned Systems

JUN-JUL 2018

Inside Unmanned Systems provides actionable business intelligence to decision-makers and influencers operating within the global UAS community. Features include analysis of key technologies, policy/regulatory developments and new product design.

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MARINE COMMUNICATIONS 52   June/July 2018 unmanned systems inside configurable can help scientists rapidly test and deploy communications and networking techniques, Sklivanitis said. The scientists will also aim to reduce the impact of their underwater acoustic networks on marine life by minimizing sound power levels and designing acoustic signals proven to reduce biological discomfort, Sklivanitis said. "We believe that the proposed software- defined modem technology offers a way for- ward to more bio-friendly acoustic modem devices for operation in regions with sensitive fauna or increasingly strict environmental controls," he noted. EXPERIMENTING The scientists will f irst analyze the range, accuracy and transmission rates enabled by their strategy in a 30-foot-deep water tank at Florida Atlantic Universit y. They w ill next perform experiments in the Atlantic Ocean off the coast of Dania Beach at the university's Institute for Ocean and Systems Engineering. The research team's ex per iments w ill start by testing how well their techniques can pinpoint and track the location of ma- rine robots. They will begin with speaker- phone arrays placed at various locations in the water, and then move to speakerphone arrays loaded onto autonomous underwater vehicles, Pados said. In their experiments so far with underwa- ter acoustic modems, "we were able to get about 300,000 bits per second over distances of a quarter of a mile," Pados said. "In com- parison, right now, commercial systems used by the navy have data rates that are as low as 10,000 or 20,000 bits per second—which are like the data rates we had with dialup modems in the mid-90s, which you could do little with except send email. If we can go up to 300,000, that's enough to stream maybe a small-size video." A diagram of a network connecting assets under the water, on the water's surface, in the air and in space. Diagrams courtesy of George Sklivanitis. "THE MOST CRITICAL APPLICATION OF COGNITIVE NETWORKING MAY BE UNDERWATER, BECAUSE THE PROBLEM OF CREATING EFFECTIVE LINKS AND NETWORKS IS SO MUCH MORE DIFFICULT UNDERWATER THAN AERIALLY." Dimitris Pados, co-principal investigator and professor, Florida Atlantic University

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