Inside Unmanned Systems

DEC 2017 - JAN 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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33 unmanned systems inside December 2017/January 2018 characteristic criteria identified the better the results. When your detection can identify objects as well as differentiate between simi- lar profiles, the system will then get low false alarm rates. Detection coverage ranges is another area to track, and it is tentatively the distance covered by the radio control link under the simila r propagation conditions, Mayser explained. "Locating drone signals is also a challenge because we have very short durations and we have frequency agile systems, as well as co-channel interferences because different signals are used at the same time," he added. "Also in urban environments we always have multipath propagation." To summarize, the R&S ARDRONIS solu- tion is the only sensor that provides an early warning and the location of the operator. Other benefits include reliability in real en- vironment, 24/7 operation, and the system's capability to be expanded in the future. The Role of Radar Romero f rom Bla ck Sage Tech nolog ie s described using radar as an active detec- tion component in a layered counter UAS system. Unlike RF detection, a radar is not going to provide the position of the aircraft or the op- erator before it takes off. But what it will do is provide a detection of all moving objects inside its field of view. Using radar can provide a passive early warning that leads to increased operator vigi- lance for detection in actively monitored air- space, and radar also picks up where passive detection leaves off: all moving objects includ- ing UAS f lying autonomously. This technology is therefore a valuable detection modality for a layered CUAS system. CUAS radar surveils airspace in volumes and the act of detection is going to provide characteristic data, including high altitudes. "We can no longer consider security in two just dimensions. We have got to consider high- f lying threats as well," Romero said. He compared three common CUAS radars and explained their ranges, coverages and costs—compact f lat panel pulse Doppler, com- pact f lat panel ESA, rotating ESA. "These three different sensors can be com- bined into a system that can do things like con- tour urban environments, using different panels to cover urban canyons, and to be able to scale across very large complex sites where smaller panels are necessary," Romero said. Using radars for counter UAS detects all moving objects within the sensor fields of view; coverage can be easily scaled across large and complex sites by adding more sensors; it provides 3D geolocation of moving objects; and provides characteristic data that describes moving objects. "There are two primary reasons," Romero said, "one is because they provide the active detection of moving objects in the scene, birds, fixed wing, a manned aircraft, UAS, and they provide the accurate position of that object. So radars are giving us a horizontal angle from the sensor, a vertical angle from the sensor, and those are extrapulated into latitude, longitude and altitude. We can do a lot of neat things us- ing that accurate 3D position along with the characteristic data provided by each detection." With object characteristics, what you're searching for is the highest quality data pos- sible and the greatest number of characteris- tics that come from the sensor, he said. Over time as you get detections in you can calculate other characteristics that help build a very strong signature or unique profile of an object. "All these characteristics combined give us this signature that allows us to differentiate different classes of moving objects," he said. "To be able to differentiate a UAS from a bird for example. So, in order to effectively classify a target we're looking for as much data as we can get from a sensor."

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