Design and experiment of onboard laser time transfer in Chinese Beidou navigation satellites |
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Authors: | Wendong Meng Haifeng Zhang Peicheng Huang Jie Wang Zhongping Zhang Ying Liao Yang Ye Wei Hu Yuanming Wang Wanzhen Chen Fumin Yang Ivan Prochazka |
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Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 20030, China;2. China Academy of Space Technology, Beijing 100094, China;3. Czech Technical University in Prague, 115 19 Prague 1, Czech Republic |
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Abstract: | High-precision time synchronization between satellites and ground stations plays the vital role in satellite navigation system. Laser time transfer (LTT) technology is widely recognized as the highest accuracy way to achieve time synchronization derived from satellite laser ranging (SLR) technology. Onboard LTT payload has been designed and developed by Shanghai Astronomical Observatory, and successfully applied to Chinese Beidou navigation satellites. By using the SLR system, with strictly controlling laser firing time and developing LTT data processing system on ground, the high precise onboard laser time transfer experiment has been first performed for satellite navigation system in the world. The clock difference and relative frequency difference between the ground hydrogen maser and space rubidium clocks have been obtained, with the precision of approximately 300 ps and relative frequency stability of 10E−14. This article describes the development of onboard LTT payload, introduces the principle, system composition, applications and LTT measuring results for Chinese satellite navigation system. |
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Keywords: | Navigation satellites Time synchronization Laser time transfer (LTT) Measuring experiment Satellite laser ranging (SLR) |
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