| 基于1Mcps/s码速率的亚欧卫星双向时间比对性能分析 |
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| 引用本文： | 王翔,董绍武,武文俊,宋会杰,王威雄.基于1Mcps/s码速率的亚欧卫星双向时间比对性能分析[J].天文学报,2019,60(6):26-35. |
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| 作者姓名： | 王翔 董绍武 武文俊 宋会杰 王威雄 |
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| 作者单位： | 中国科学院国家授时中心西安710600;中国科学院时间频率重点实验室西安710600,中国科学院国家授时中心西安710600;中国科学院时间频率重点实验室西安710600;中国科学院大学天文与空间科学学院北京100049,中国科学院国家授时中心西安710600;中国科学院时间频率重点实验室西安710600;中国科学院大学天文与空间科学学院北京100049,中国科学院国家授时中心西安710600;中国科学院时间频率重点实验室西安710600,中国科学院国家授时中心西安710600;中国科学院大学北京100049 |
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| 基金项目： | 国家自然科学基金项目(11703030)、中国科学院``西部青年学者'' (XAB2017A06)项目资助 |
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| 摘 要： | 卫星信道租赁费是目前卫星双向时间传递(Two-Way Satellite Time and Frequency Transfer, TWSTFT)的主要成本之一.在2017年5月以前,参与UTC (Coordinated Universal Time)计算的亚洲-欧洲实验室之间进行Ku波段卫星双向时间频率传递一直使用2.5 Mcps/s码速率,带宽为2.5 MHz的伪随机码.为了在不影响时间频率传递性能的前提下降低成本,在欧亚间首次尝试采用1 Mcps/s码速率,带宽为1.7 MHz的伪随机码,进行亚欧卫星双向时间传递.并使用已校准的GPS PPP (Global Position System Precise Point Positioning)链路为双向链路进行间接校准.选择2018年12月的TWSTFT链路数据,分析链路性能发现,通过ABS-2A卫星,使用1 Mcps/s码速率构建的卫星双向时间比对链路的日频率稳定度达到10~(-15),时间稳定度优于0.3 ns.与已校准的GPS PPP链路数据进行验证分析,结果表明,使用1 Mcps/s码速率进行超长距离卫星双向时间传递与已校准的GPS PPP时间传递结果一致,与传统手段相比,其系统造价低,时间传递性能可以满足国际原子时计算的需求.
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| 关 键 词： | 卫星双向时间传递 精密单点定位 链路校准 性能分析 |
| 收稿时间： | 2019/3/20 0:00:00 |
| 修稿时间： | 2019/4/29 0:00:00 |
Performance Analysis of Two-Way Time Comparison of Eurasian Satellites Based on 1Mcps/s Code |
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| WANG Xiang,DONG Shao-wu,WU Wen-jun,SONG Hui-jie and WANG Wei-xiong.Performance Analysis of Two-Way Time Comparison of Eurasian Satellites Based on 1Mcps/s Code[J].Acta Astronomica Sinica,2019,60(6):26-35. |
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| Authors: | WANG Xiang DONG Shao-wu WU Wen-jun SONG Hui-jie and WANG Wei-xiong |
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| Institution: | National Time Service Center, Chinese Academy of Sciences, Xián 710600;Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xián 710600,National Time Service Center, Chinese Academy of Sciences, Xián 710600;Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xián 710600;School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049,National Time Service Center, Chinese Academy of Sciences, Xián 710600;Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xián 710600;School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049,National Time Service Center, Chinese Academy of Sciences, Xián 710600;Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xián 710600 and National Time Service Center, Chinese Academy of Sciences, Xián 710600;University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | The bandwidth leased on Earth satellites directly affects the operation cost of TWSTFT (Two-Way Satellite Time and Frequency Transfer). %(Or satellite channel leasing fee is one of the main costs of two-way satellite time transfer at present.) Until May 2017, the Ku-band TWSTFT between Asian-European laboratories involved in UTC (Coordinated Universal Time) computing had been using the 2.5Mcps/s pseudo-random codes with a bandwidth of 2.5MHz. In order to reduce the cost without affecting the performance of time and frequency, a pseudo-random code with 1Mcps/s bandwidth of 1.7MHz is first attempted to transmit time bidirectionally between Eurasian and Asian satellites in China. An indirect calibration for the bidirectional links by using the calibrated GPS PPP (Global Position System Precise Point Positioning) links reduces the link uncertainty. The TWSTFT link data of December 2018 are selected to analyze the link performance. It is found that the daily frequency stability and time stability of the satellite bidirectional time comparison link constructed with 1Mcps/s code rate reach $10^{-15 |
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| Keywords: | two-way satellite time and frequency transfer precise point positioning link calibration performance analysis |
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