中文摘要：

IGS的事后精密钟差产品采取以天为单位的数据处理策略,这导致在天与天之间的交界处卫星的钟差基准不连续。对需要进行跨天数据处理的精密单点定位用户,会发生基准跳跃的卫星模糊度在交界历元处不连贯,这无异于产生了一个无法修复的非整周的周跳,使得滤波需要重新收敛。详细分析了30d每颗卫星跳跃的量级以及对精密单点定位用户的影响,在详细阐述IGS钟差解算策略的基础上,分析了产生这种不连续性的原因,并提出了两种应对策略：1在IGS精密钟差产品中加入钟差基准跳跃信息供用户使用;2将钟差基准在多天连续估计。最后给出了这两种策略的数据处理结果,验证了两种方法的有效性。

英文摘要：

As a consequence of a daily data processing strategy, an adjacent IGS final precise clock product displays discontinuity at the junction of two successive days. This will cause a jump in positioning results for the pseudo-range, and change all the related ambiguities. These non-integer cycle slips will require filtering to make them converge. In this paper, the magnitude of the jump of every satellite for a seven day cycle is investigated in detail. Then, based on the full discussion of the data processing strategy of the IGS center, the reasons for discontinuity and the precision of the final clock product are presented. Two counter measures are proposed： one is to insert the jump in the satellite clock datum into the IGS clock product; the other is to estimate the clock datum for adjacent days. Finally the results of the two processing strategies are presented.