基于实时性和数据使用率改进的CGGTTS算法研究

Study on Modified CGGTTS Algorithm Based on Real-time Performance and Data Utilization Rate

对GNSS时间频率传递数据标准格式CGGTTS进行改进,包括:将数据周期内全部测量数据用于计算时差值,提高测量数据使用率;为满足时间传递用户对于数据实时性的更高要求,缩短CGGTTS数据周期以提高数据实时性。实验结果表明将数据使用率提高到100%后,可以降低比对结果噪声,噪声性能最大可改善6%。当将数据间隔缩短至5 min后,数据实时性最大提高至69%,噪声性能恶化17%以上。分析不同间隔文件的实时性、标准差、数据量及运算量情况,得到当数据间隔在8至13 min时,改进的CGGTTS算法共钟差实验噪声水平保持在(0.70~0.80)ns,长基线实验噪声水平保持在(0.75~0.83)ns,是一种折中选择。

To avoid waste of measurement data,the GNSS time-frequency transfer data standard format CGGTTS has been improved.The improvement mainly includes:using all the measurement data in the data period to calculate the time difference values to improve the utilization rate of the measurement data.At the same time,in order to meet the higher requirements of time transfer users for real-time data,the CGGTTS data period is shortened to improve the performance of real-time.The experimental results show that when the data usage rate is increased to 100%,the noise of the comparison results can be reduced,and the noise performance can be improved by up to 6%.After shortening the data interval to 5 minutes,the real-time performance of the data is increased to 69%,and the noise performance deteriorates by more than 17%.Analyze the real-time performance,standard deviation,data volume,and calculation volume of files at different intervals,and it is obtained that when the data interval is between 8 and 13 minutes,the improved CGGTTS algorithm keeps the noise level of the common clock difference experiments at(0.70~0.80)ns,and the noise level of the long baseline experiments at(0.75~0.83)ns,which is a compromise choice.