用GRACE进行GPS无线电掩星：利用零差技术的大气剖面
GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique
摘要：
分析了GRACE-B卫星上GPS接收机在2004年7月28-29日记录到的无线电掩星事件。接收器时钟的稳定性允许使用零差技术导出过量的相位轮廓，从而使得与参考GPS卫星的同时观测的校准程序过时。用零差法得到的101条水汽活度廓线和用改进的单差法计算的96条水汽活度廓线与ECMWF同站气象分析结果进行了比较。在5 ~ 30 km的高度上，观测结果一致性较好，平均放射性活度偏差小于1%，标准差为2- 3%。端到端模拟的结果与这些观察结果一致。
英文摘要：
Radio occultation events recorded on 28-29 July 2004 by a GPS receiver aboard the GRACE-B satellite are analyzed. The stability of the receiver clock allows for the derivation of excess phase profiles using a zero difference technique, rendering the calibration procedure with concurrent observations of a reference GPS satellite obsolete. 101 refractivity profiles obtained by zero differencing and 96 profiles calculated with an improved single difference method are compared with co-located ECMWF meteorological analyses. Good agreement is found at altitudes between 5 and 30 km with an average fractional refractivity deviation below 1% and a standard deviation of 2-3%. Results from end-to-end simulations are consistent with these observations.
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