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中文摘要：
采用频谱分析法，对IGS精密星历中各卫星的钟差精度进行了分析，发现不同的卫星钟钟差存在精度差异；通过与卫星钟差的标称精度相比较，发现部分IGS精密星历钟差还存在量级偏差。
英文摘要：
Precision of satellite clock is one of the most important factors in GPS precise positioning, with widely applications of IGS precise ephemeris, which becomes a more and more attractive research orientation. Spectral analysis method is applied to analyze the precision of IGS precise ephemeris clock. The conclusions show that different satellite clocks have different precisions, and some of them have great magnitudes than the so-called precision.
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