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학술지 Tracking Efficiency Improvement According to Incident Beam Size in QPD-Based PAT System for Common Path-Based Full-Duplex FSO Terminals
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박시웅, 여찬일, 허영순, 류지형, 강현서, 이동선, 장재형
Sensors, v.22 no.20, pp.1-11
22ZK1100, 호남권 지역산업 기반 ICT 융합기술 고도화 지원사업, 강현서
Free space optical (FSO) communication can support various unmanned aerial vehicles' (UAVs) applications that require large capacity data transmission. In order to perform FSO communication between two terminals, it is essential to employ a pointing, acquisition, and tracking (PAT) system with an efficient and optimal performance. We report on the development of a common optical-path-based FSO communication system, tailored for applications in UAVs. The proposed system is equipped with a quadrant photodiode (QPD)-based PAT system without an additional beacon beam subsystem. The presented approach reduced the structural complexity and improved the tracking efficiency for the same size, weight, and power (SWaP). To achieve a robust FSO link in a dynamic UAV environment, the observability and controllability were obtained based on the linearized control according to the incident beam size on the QPD, which was verified by optical simulation and experiments. As a result, the QPD-based PAT system for implementing FSO links demonstrated an up to 4.25 times faster tracking performance. Moreover, the FSO link experimentally confirmed the 1.25 Gbps full-duplex error-free communication at a 50 m distance.
KSP 제안 키워드
25 Gbps, Beam size, Common path, Communication system, Data transmission, Full-Duplex(FuDu), Large capacity, Linearized Control, Optical simulation, Quadrant photodiode, Structural complexity
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