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中文摘要：
分析了GRACE卫星在掩星天线关闭和开启状态下GPS观测数据中系统误差的分布情况。结果表明,在掩星天线开启时,观测数据中存在着由于＂信号串扰＂引起的系统误差,其在消电离层组合P3上的数值最大可达6 m,而对载波相位的影响相对较小。进一步采用降权方法分析了P3观测值对精密定轨的影响。当P3组合观测值标准差大于等于4.0 m时,定轨精度达到最优,在X、Y和Z轴的定轨精度分别为3.9 cm、4.0 cm和3.3 cm。
英文摘要：
The systematic errors of GPS data from GRACE satellite are analyzed,and the numerical results indicate that the multipath error is not significant while the occultation antenna is turned off.But when the occultation antenna is turned on,in the aft-looking hemisphere,there are clearly multipath-like systematic error in the code observations which is caused by the cross-talk between the prime POD and occultation antenna string,but the analysis indicate that the cross-talk systematic error in the carrier phase observations can be ignored.So in the orbit determination processing,the weight of the code observations are adjusting to reduce its impact on the POD results.The numerical results show that when the STD of the P3 observation is greater than 4.0 m,the POD results can achieve the best precision,which is 3.9 cm,4.0 cm,and 3.4 cm in X,Y,Z respectively.
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