1 Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; 2 State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China; 3 Department of Precision Instruments, Tsinghua University, Beijing 100084, China; 4 Department of Physics, Tsinghua University, Beijing 100084, China
Abstract We demonstrate a novel and stable frequency transfer scheme over ground-to-satellite link based on real-time carrier-phase detection and compensation. We performed a zero-baseline measurement with the designed system, an uninterrupted frequency standard signal is recovered in the reception station without additional post-correction of delay error caused in the route, which is because the phase error of the entire route is tracked and compensated continuously in real-time. To achieve this goal, we employed two carriers in the system and the differential signal is transferred in order to eliminate the instability results from the local oscillator at the satellite transponder as well as the common-mode noise induced in the transfer route and microwave components. The stability of 3×10-16 with an integration time of 1 day was achieved and the time fluctuation during one day was measured to be about ±20 ps. Error sources and possible solutions are discussed. Our zero-baseline method shows a promising result for real-time satellite-based time and frequency transfer and deserves further research to find whether it works between long-baseline stations.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0302101) and the Initiative Program of State Key Laboratory of Precision Measurement Technology and Instruments.
Corresponding Authors:
Shi-Guang Wang, Li-Jun Wang
E-mail: wangsg@tsinghua.edu.cn;lwan@tsinghua.edu.cn
Cite this article:
Hui-Jian Liang(梁慧剑), Shi-Guang Wang(王时光), Yu Bai(白钰), Si-Chen Sun(孙思忱), and Li-Jun Wang(王力军) Real-time frequency transfer system over ground-to-satellite link based on carrier-phase compensation at 10-16 level 2021 Chin. Phys. B 30 080601
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