| 星地双向时差测量系统周跳探测与修复算法 |
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| 引用本文： | 韩子彬,白燕,张峰,郭燕铭,卢晓春.星地双向时差测量系统周跳探测与修复算法[J].全球定位系统,2022,47(3):65-72. |
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| 作者姓名： | 韩子彬 白燕 张峰 郭燕铭 卢晓春 |
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| 作者单位： | 1.中国科学院国家授时中心, 西安 710600 |
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| 基金项目： | 国家自然科学基金(11873009) |
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| 摘 要： | 随着空间时间频率基准的精度越来越高，需要与之匹配的空间时频传递技术. 基于载波相位的星地双向时差测量方法可以实现更高的时间频率传递精度，但对于复杂的星地环境，由于航天器飞行动态高，时频传递链路的传输频率高，载波多普勒效应大，更容易出现粗差和周跳. 基于此，研究一种适合高动态环境下的星地双向时差测量系统载波相位周跳探测与修复方法，提出一种适用于三频组合模式的双向周跳探测与修复方法. 该方法联合双频码相 (MW)组合法可以实现不同类型周跳的探测与修复，对于上下行三条微波链路均可探测出周跳的存在并实现毫米级周跳修复精度. 进一步对基于载波相位测量的星地双向时差测量系统的星地时间同步性能进行分析，在经过周跳探测与修复，以及链路时延数据处理，其星地时间同步精度优于0.3×10–12 s.
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| 关 键 词： | 时频传递 双向时差测量 载波相位 周跳探测与修复 时间同步 |
| 收稿时间： | 2021-12-02 |
Cycle-slip detection and reparation algorithm for satellite-ground two-way time difference measurements |
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| Institution: | 1.National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China2.Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences, Xi’an 710600, China3.China Xi’an Satellite Control Center, Xi’an 710043, China4.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | High precision time-frequency reference requires high precision time-frequency transfer technology. The satellite-ground two-way time difference of carrier phase measurement can achieve higher time-frequency transfer accuracy. However, in the complex satellite-ground environments, due to the high flight dynamics of the spacecraft and the high transmission frequency of the time-frequency link, and the carrier doppler effect is large, gross errors and cycle slips are more likely to occur. This paper focuses on a carrier phase cycle slip detection and reparation algorithm for satellite-ground two-way time difference measurement system in high dynamic environment, and proposes a two-way cycle slip detection and reparation method for three-frequency mode. This method combined with Melbaurne wubbena (MW) combination method can realize the detection and repair of different types of cycle slips. For the three links, the existence of cycle slips can be detected and the mm-level cycle slip repair accuracy can be realized. The satellite-ground time synchronization performance of the satellite-ground two-way time difference measurement system based on carrier phase measurement is further analyzed. After cycle slip detection and repair, and link delay data processing, the time synchronization accuracy is better than 0.3×10–12 s. |
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