高精度自由空间时间与频率传递研究

Research on high-precision free-space time and frequency transfer

利用自由空间信道实现时间与频率信号的传递,可以有效克服现有光纤时频传递技术依赖于光纤网的问题。报告了电子科技大学在自由空间时间频率传递方面的研究进展。首先提出了基于主动相位补偿法的连续激光自由空间频率传递技术,利用该技术完成了100m室外频率传递实验,在5ks内所传递频率信号的时延抖动标准差为490fs;其次提出了基于被动相位补偿法的光梳频率自由空间传递技术,并利用该技术完成了52m室外频率传递实验,在5ks内所传递频率信号的时延抖动标准差为280fs;最后提出了基于往返时间时延补偿法的自由空间时间传递技术,利用该技术进行了室外120m时间传递同步实验,在16ks内所传递时间信号的绝对时延差为300ps,其时间传递稳定度优于20ps。

Atmospheric time and frequency transfer over free-space link can overcome the problem that the fiber-based time and frequency transfer relies on the optical fiber networks. The latest results on time and frequency transfer via free-space link in University of Electronic Science and Technology of China is reported. Firstly, we proposed an atmospheric continuous laser frequency transfer technique with active phase compensation. With this technique,a 100 m outdoor ftee-space frequency transfer experiment was carried out,and a standard deviation of 490 fs for timing fluctuation was achieved within 5 ks. Secondly,we proposed an atmospheric frequency transfer technique with passive phase compensation. With this technique,a 52 m outdoor free-space frequency transfer experiment was carried out, and a standard deviation of 280 fs for timing fluctuation was achieved within 5 ks. Finally, we proposed an atmospheric time transfer technique with round-trip time delay compensation. With this technique,a 120 m outdoor free -space time transfer experiment was carried out, and 20 ps were achieved.