Airborne Radar Based Collision Detection and Avoidance System for Unmanned Aircraft Systems in a Varying Environment - Li, Hongru; Kinsner, Witold; Wang, Yan; Palma, Brenn; Tay, Alan (2021 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE), Wireless for Space and Extreme Environments (WiSEE), 2021 IEEE International Conference on, 2021)