페이지 정보작성자 최고관리자 작성일17-09-22 14:57 조회446회 댓글0건
Jun-Seuk Suh, Laxmikant Minz, Dae-Hwan Jung, Hyun-Seong Kang, Jong-Wook Ham, Seong-Ook Park, “Drone-Based External Calibration of a Fully Synchronized Ku-Band Heterodyne FMCW Radar”,IEEE Transactions on Instrumentation and Measurement, Vol. 66, Iss. 8, Aug. 2017
This paper discusses a novel drone-based external radar calibration technique, which utilizes a metal sphere hanging from a drone. The advantages of drone-based calibration are introduced and applied to a dual intermediate-frequency frequency-modulation continuous-wave (FMCW) radar system, which was developed to detect a low radar cross section (RCS) target like a drone with high sensitivity. The developed radar system operates in 150-MHz bandwidth with a frequency sweeping time of 500 μm at Ku-band frequencies. A 75-Ω coaxial cable was utilized in the radar system to physically separate the transmitter (Tx) and receiver (Rx) modules for better isolation. The physical separation with a coaxial cable helps in reducing Tx leakage signal effect, which is a critical concern of typical FMCW radar system, and also it helps the proposed radar system to have higher sensitivity. The designed radar system is a wired system that is fully synchronized with an internal reference clock generator. Offset frequency and other compensation factors were calculated for the calibration of the radar system using a big size metal sphere hanging from a drone. We observed that the theoretical calculations using the standard radar equation and the measurement results on calibration are in good agreement with each other. Furthermore, the RCS value of a small size drone is also investigated using the calibrated radar system. The RCS value estimated for the drone was about -22 dBsm.
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