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15 December 2022 High precision time-frequency transfer based on all-digital coherent demodulation
Funan Zhu, Shaowen Lu, Jianfeng Sun, Weibiao Chen
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Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 124781S (2022) https://doi.org/10.1117/12.2654544
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China
Abstract
With the development of space laser communication, it begins to apply in various scenarios and high-precision time frequency transfer is the important one. In this paper, method of high-precision time-frequency transfer is proposed based on all-digital coherent demodulation. The parallel timing synchronization algorithm in all-digital coherent demodulation is described and its process is implemented in FPGA. The phase time could be acquired in time when operating timing synchronization in BPSK coherent laser communication experiment. Through phase unwrapping, the phase time becomes continuous. Then time transfer precision and frequency stability could be calculated and assessed by standard deviation and Allan variance separately. The phase time precision of below 5ps and frequency stability of below 10-14 /1000s could be realized when the communication rate is 1.25Gbps. Further, the time-frequency precision could be improved after dealing with phase time using linear Kalman filter.
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Funan Zhu, Shaowen Lu, Jianfeng Sun, and Weibiao Chen "High precision time-frequency transfer based on all-digital coherent demodulation", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 124781S (15 December 2022); https://doi.org/10.1117/12.2654544
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KEYWORDS
Demodulation
Time-frequency analysis
Phase shift keying
Filtering (signal processing)
Laser communications
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