Analysis of Two-Way Satellite Time and Frequency Transfer with C-Band
Analysis of Two-Way Satellite Time and Frequency Transfer with C-Band
复制标题
DOI：
10.1109/freq.2007.4319209
复制
发表时间：
2007-10
期刊：
影响因子：
--
通讯作者：
Yang Xuhai;Li Zhigang;Hua Aihui
中科院分区：
文献类型：
--
作者：
Yang Xuhai;Li Zhigang;Hua Aihui
C波段双向卫星时间频率传输(TWSTFT)受电离层延迟的影响比Ku波段更严重。西安至乌鲁木齐之间的C频段TWSTFT链路已建成，通过东经110.5°的SINOSAT-1地球静止卫星工作，上行频率6.3 GHz，下行频率4.1 GHz。为了研究和评估C波段TWSTFT链路中电离层延迟带来的不稳定性，我们根据国际GNSS服务（IGS）提供的2006年全球TEC地图计算了电离层延迟的影响。首先，我们基于IGS TEC数据文件建立了球体和谐模型，这样我们就可以轻松获得任意时间距地球表面450 km的球体上任意穿透点的TEC。然后，我们用两个站的坐标和卫星的标称坐标来计算两个穿透点的位置。然后计算各站的上下行电离层延迟，并得出对TWSTFT的影响。结果表明，C波段TWSTFT链路中电离层延迟引入的非互易性逐日变化，2006年日变化最大幅度为0.38 ns。
Two-Way Satellite Time and Frequency Transfer (TWSTFT) with C-band is influenced more seriously by ionosphere delay than that with Ku-band. The TWSTFT link between Xi'an and Urumchi with C-band has been established and it works via SINOSAT-1 geostationary satellite at 110.5deg E with the uplink frequency 6.3 GHz and downlink frequency 4.1 GHz. To study and evaluate the instability introduced by ionosphere delay in the TWSTFT link with C-band, we calculated the influence of ionosphere delay based on global TEC map in 2006 provided by the International GNSS Services (IGS). First, we build a sphere harmonious model based on IGS TEC data file, so that we can easily obtain the TEC at any penetration point on the sphere 450 km above the earth surface at any time. Then, we calculate the two penetration point positions with the coordinates of two stations and the nominal coordinate of the satellite. After that, the uplink and downlink ionosphere delay of each station are calculated, and the influence to TWSTFT is also obtained. The result shows that the non-reciprocity introduced by ionosphere delay in the TWSTFT link with C-band varies day by day, and the maximum amplitude of the daily variation is 0.38 ns in 2006.