北斗导航系统卫星频间钟差偏差

卫星频间钟差偏差（Inter-Frequency Clock Bias, IFCB）变化特性的分析对其模型化、卫星钟稳定性的评估具有重要的意义。采用北斗(COMPASS) 2012年1月的三频数据，解算了GEO卫星的IFCB并分析了其时序特性。为了削弱粗差对解算结果的影响，采用了抗差估计算法。针对GEO卫星IFCB的特性，提出了GEO卫星IFCB的经验模型。结果表明，二次曲线函数能较好的描述GEO卫星的IFCB，并达到71%以上的改正效果。

Inter-frequency Clock Bi as of BeiDou

It is very meaningful for modeling the inter-frequency clock bias (IFCB) and assessing the stability of the satellite clock to analyze the characterization of the IFCB. The triple-frequency data from COMPASS covering Jan.1-31, 2012 is processed to compute the IFCB of the GEO satellite. To reduce the influence of the gross error on the computed results, the robust estimation is used in data processing. Based on the estimated results, the IFCB series of the GEO satellite is analyzed. According to the features of the IFCB of the GEO satellites, an empirical model is presented. The performances of the model indicate that the quadratic function can describe the IFCB of the COMPASS GEO satellite well, by which more than 71% inter-frequency clock bias can be corrected.