TY  - JOUR
T1  - Beam Tracking Method Based on KLT Tracker in Free Space Optical Communication
AU  - Kim, Jong-Min 
AU  - Park, Ki-Hong 
AU  - Ko, Young-Chai 
AU  - Alouini, Mohamed-Slim 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2026
DA  - 2026/1/1
DO  - 10.7840/kics.2026.51.1.93
KW  - FSO
KW  - Beam Tracking
KW  - KLT Tracker
AB  - In this paper, we propose a beam tracking method utilizing a camera in FSO communication to mitigate beam pointing errors between transceiver. The proposed system adopts the KLT tracker which is developed in the field of computer vision to estimate the position of receiver. Using the estimated results, a 2-axis gimbal is controlled to align the beam pointing in real-time. Under ideal motor control conditions, the proposed method achieved an 80% reduction in pointing error along with a 1.47 dB signal-to-noise ratio(SNR) margin, which enables a stable communication link. In addition, considering image processing and motor control latency, it is observed that the proposed method remains valid as long as the coherence time of beam pointing error is slower than the camera frame rate.