Radionor Communications When communication is critical High mobility Ultralong range Navigation without GNSS Unmatched jamming resilience Radionor Communications delivers military broadband radios, for highly mobile operations in need of unmatched range, robust and jamming resilient communications, with world leading massive array antenna technology. Radionor.no Visit us at DSEI, booth H7-117 Primoco One 150 | Dossier would jump quite a bit,” Fojtik recalls. “So now we use telescoping structures that absorb the shocks of hard landings: the landing gear dissipates the impact energy by flexing and contracting.” The telescopes are hydro-pneumatic systems installed on the upper part of the landing gear, and can be tuned for the anticipated landing terrain. The wheels integrate electromagnetic brakes for controlled slowdowns once the UAV has landed and stabilised. These, and around 25 other parts, comprise the landing gear. “The undercarriage was designed and calculated part for part in CAD for load distribution, and as per STANAG 4703 it’s been tested to hold 1 t of weight, as a safety margin for our 150 kg UAV in heavy loads or landings,” Fojtik says. “And if loads are too much, usually just one part breaks, leaving the vast majority of the landing gears reusable, and they’re designed to be disassembled and put back together fairly easily.” Safety during landing and jamming A radar altimeter installed in the bottom of the craft feeds the autopilot with timely and precise updates on the terrain below the UAV, to ensure a controlled touchdown wherever possible. “The vertical accuracy of GNSS, if it’s even provided, can be as high as 50 m,” Fojtik says “That’s a huge and potentially catastrophic margin of error, and even air pressure sensors can be thrown off by simple things like landing near a river or other body of water. “That’s why we have our radar altimeter, which starts tracking from 200 m above ground level, and that’s how we’ve done the vast majority of our flights in a fully autonomous regime, without issuing the UAV with a single in-flight correction.” Regarding how Primoco came to develop defences against jamming, Fojtik recounts, “One Middle East-based user had a real fear of their UAV assets being hit with jamming attacks while surveying oil infrastructure, but you can’t just shield the aircraft’s hull and network against jamming signals because you risk blocking your own data links or GNSS, so we engineered ways to fly under jammed conditions, and they worked.” Since then, the company has honed its anti-jamming technologies, with the result that the One 150 is one of the few UAVs available to military customers today that can consistently and reliably fly in jammed environments. Although it had prepared to do so in the context of oil infrastructure inspections, the UAV began proving its ISTAR abilities around the same time that Primoco gained its LUC. The company emphasises here that although it flies many defence missions in addition to its commercial and civilian applications, the One 150 is not a combat aircraft, and is never used to drop munitions of any kind. However, the different design
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