Time synchronization between ground and satellites is a key technology for satellite navigation system. With dual-channel satellite, a method called Two-Way Common-View(TWCV) satellite time transfer for Compass system...Time synchronization between ground and satellites is a key technology for satellite navigation system. With dual-channel satellite, a method called Two-Way Common-View(TWCV) satellite time transfer for Compass system is proposed, which combines both characteristics of satellite common-view and two-way satellite-ground time transfer. By satellite-ground two-way pseudo-range differencing and two stations common-view differencing, this TWCV method can completely eliminate the influence of common errors, such as satellite clock offset, ephemeris errors, troposphere delay and station coordinates errors. At the same time, ionosphere delay related to signal frequency is also weakened significantly. So the precision of time transfer is improved much more greatly than before. In this paper, the basic principle is introduced in detail, the effect of major errors is analyzed and the practical calculation model in the Earth-fixed coordinate system for this new method is provided. Finally, experiment analysis is conducted with actual Compass observing data. The results show that the deviation and the stability of the satellite dual channel can be better than 0.1 ns, and the accuracy of the two-way common-view satellite time transfer can achieve 0.4 ns. All these results have verified the correctness of this TWCV method and model. In addition, we compare this TWCV satellite time transfer with the independent C-band TWSTFT(Two-Way Satellite Time and Frequency Transfer). It shows that the result of the TWCV satellite time transfer is in accordance with the C-band TWSTFT result, which further suggests that the TWCV method is a remote high precision time transfer technique. The research results in this paper are very important references for the development and application of Compass satellite navigation system.展开更多
随着卫星共视时间比对方法的广泛应用,国际频率咨询委员会(Consultative Committee for Time and Frequency,CCTF)发布了扩展的时间传递标准(Common GNSS Generic Time Transfer Standard Version2E,CGGTTS V2E),同时国内外产生了各种...随着卫星共视时间比对方法的广泛应用,国际频率咨询委员会(Consultative Committee for Time and Frequency,CCTF)发布了扩展的时间传递标准(Common GNSS Generic Time Transfer Standard Version2E,CGGTTS V2E),同时国内外产生了各种数据处理软件来生成全球卫星导航时间传递标准(Common GNSS Generic Time Transfer Standard,CGGTTS)文件,对此类软件的性能评估已成为时间传递领域的需求。为此对比利时皇家天文台开发的R2CGGTTS开展GNSS时间传递数据生成性能分析研究,通过接收机单站验证和双站比对试验,分析检验不同系统频点CGGTTS时差数据生成的一致性和稳定性等性能指标。结果表明,R2CGGTTS生成GNSS时间传递数据的均值差可控制在亚纳秒量级,且频率稳定度可达到10-15量级,可见由R2CGGTTS生成的GNSS时间传递数据在多系统时间传递中的可靠性。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.41174027)the National High-tech Research and Development Program(863 Program)(Grant No.2013AA122402)
文摘Time synchronization between ground and satellites is a key technology for satellite navigation system. With dual-channel satellite, a method called Two-Way Common-View(TWCV) satellite time transfer for Compass system is proposed, which combines both characteristics of satellite common-view and two-way satellite-ground time transfer. By satellite-ground two-way pseudo-range differencing and two stations common-view differencing, this TWCV method can completely eliminate the influence of common errors, such as satellite clock offset, ephemeris errors, troposphere delay and station coordinates errors. At the same time, ionosphere delay related to signal frequency is also weakened significantly. So the precision of time transfer is improved much more greatly than before. In this paper, the basic principle is introduced in detail, the effect of major errors is analyzed and the practical calculation model in the Earth-fixed coordinate system for this new method is provided. Finally, experiment analysis is conducted with actual Compass observing data. The results show that the deviation and the stability of the satellite dual channel can be better than 0.1 ns, and the accuracy of the two-way common-view satellite time transfer can achieve 0.4 ns. All these results have verified the correctness of this TWCV method and model. In addition, we compare this TWCV satellite time transfer with the independent C-band TWSTFT(Two-Way Satellite Time and Frequency Transfer). It shows that the result of the TWCV satellite time transfer is in accordance with the C-band TWSTFT result, which further suggests that the TWCV method is a remote high precision time transfer technique. The research results in this paper are very important references for the development and application of Compass satellite navigation system.
文摘随着卫星共视时间比对方法的广泛应用,国际频率咨询委员会(Consultative Committee for Time and Frequency,CCTF)发布了扩展的时间传递标准(Common GNSS Generic Time Transfer Standard Version2E,CGGTTS V2E),同时国内外产生了各种数据处理软件来生成全球卫星导航时间传递标准(Common GNSS Generic Time Transfer Standard,CGGTTS)文件,对此类软件的性能评估已成为时间传递领域的需求。为此对比利时皇家天文台开发的R2CGGTTS开展GNSS时间传递数据生成性能分析研究,通过接收机单站验证和双站比对试验,分析检验不同系统频点CGGTTS时差数据生成的一致性和稳定性等性能指标。结果表明,R2CGGTTS生成GNSS时间传递数据的均值差可控制在亚纳秒量级,且频率稳定度可达到10-15量级,可见由R2CGGTTS生成的GNSS时间传递数据在多系统时间传递中的可靠性。
