부산대학교 도서관

To unlock the economic and societal benefits of unmanned aerial vehicles (UAVs), they must possess an acceptable level of situation awareness so as not to become a public safety hazard. Implementation of a system to provide this awareness will surely involve a sense-and-avoid radar due to its capability and robustness. This paper focuses on the development of a sense-and-avoid radar system being developed for operation on a 40% scale Yak-54 UAV that will provide range, Doppler, and angle-of-arrival information of targets which might cause a collision. A two-dimensional (2-D) fast-Fourier transform (FFT) is implemented which maps targets of interest to a single range-Doppler cell. Phase differences in the target signal from an array of receiving antennas are used to determine the target echo's three-dimensional angle-of-arrival. The complete radar system consumes slightly less than 20 W. While the investigation is still underway, initial results indicate that a frequency-modulated, continuous-wave radar system using a 2-D FFT processing algorithm is one viable solution to improve UAV situation awareness.