| Abstrakt: |
Free-space optical communication links, vital in defense and military applications, rely on the atmosphere as their primary medium. However, stability challenges arise from environmental emissions and mechanical vibrations impacting beam guidance and transmission. This article investigates the influence of mechanical vibrations on bit error rate (BER). It evaluates various beam guidance methods, particularly focusing on the effectiveness of the finite state machine (FSM) beam guide within automatic tracking systems. Results indicate that implementing the FSM beam guide significantly reduces beam fluctuations, enhancing communication stability. The automatic stabilizer system achieves full stability within approximately 2 ms and effectively compensates for aiming errors, with a rise time of approximately 370 µs, indicating a prompt response to inputs. Beam vibrations in a free-space optical system are significantly reduced by the automatic tracking system, with the x-direction displacement range decreasing from approximately 18.27 cm to 0.9 cm and the y-direction displacement range decreasing from 18.52 cm to 6.5 cm. This corresponds to a reduction in displacement range by 95% and 65% along the x and y axes, respectively. The analysis further reveals a phase margin of 179 degrees, a gain margin of approximately 25 dB, and a bandwidth of around 0.4 kHz, indicating robust stability performance of the control system. This research underscores the importance of robust stabilization methods for ensuring reliable free-space optical links in dynamic environments. |
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