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Automatic Focusing Control in Beaconless APT System
Journal of Russian Laser Research ( IF 0.9 ) Pub Date : 2020-02-11 , DOI: 10.1007/s10946-020-09848-y
Xizheng Ke , Pu Zhang

AbstractThe beaconless acquisition pointing and tracking (APT) system uses signal light to act as beacon. But the signal light’s divergence angle is so small that it is difficult to capture. In this work, aiming at the different requirements of divergence angle for a free-space optical-communication (FSO) system in a different working phase, we use a stepper motor for automatic focusing control in the acquisition and pointing process to change the spot size. For this purpose, we derive a formula for the average acquisition time of continuous raster scanning. The relationship between the received power and the divergence angle under the influence of the atmospheric transmission and the pointing errors is analyzed to obtain the optimum range of the divergence angle. Also the relationship between defocusing and the divergence angle of collimated beam is given. Finally, we prove by experiments that the automatic focusing control method effectively solves the contradiction of the different divergence angles between communication phase and acquisition phase.

中文翻译:

无信标APT系统中的自动聚焦控制

摘要无信标采集指向和跟踪(APT)系统使用信号光充当信标。但是信号光的发散角很小,难以捕获。在这项工作中,针对自由空间光通信(FSO)系统在不同工作阶段的发散角的不同要求,我们使用步进电机在采集和指向过程中进行自动聚焦控制以更改光斑大小。为此,我们导出了连续光栅扫描的平均采集时间的公式。分析了大气传输和指向误差影响下的接收功率与发散角之间的关系,得到了发散角的最佳范围。还给出了散焦与准直光束发散角之间的关系。最后,通过实验证明,自动聚焦控制方法有效地解决了通信相位与采集相位之间不同发散角的矛盾。
更新日期:2020-02-11
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