Investi gation to Discontinuit y in the IGS Final Ephemeris and Corresponding Treatment
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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 在IGS精密钟差产品中加入钟差基准跳跃信息供用户使用 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.Abstract: As a consequence of a dail y data processing strate gyan ad jacent IGS final precise clockproduct dis pla ys discontinuit y at the junction of two successive days．This will cause a jump in positioning results for the pseudo－rangeand change all the related ambiguities．These non－inte ger cycle sli ps will re quire filterin g to make them converge．In this paperthe magnitude of the jump of every satellite for a seven day cycle is investi gated in detail．Thenbased on the full discussion of the data processing strate gy of the IGS centerthe reasons for discontinuit y and the precision of the final clock product are presented．Two counter measures are proposedone is to insert the jump in the satellite clock datum into the IGS clock productthe other is to estimate the clock datum for ad jacent days．Finall y the results of the two processing strate gies are presented．
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