GPS/GLONASS System Bias Estimation and Application in GPS/GLONASS Combined Positioning,in China Satellite Navigation Conference (CSNC)
GPS/GLONASS System Bias Estimation and Application in GPS/GLONASS Combined Positioning,in China Satellite Navigation Conference (CSNC)
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DOI：
10.1007/978-3-642-37404-3_29
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Junping Chen;Xiao Pei;Yize Zhang;Bin Wu
中科院分区：
文献类型：
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作者：
Junping Chen;Xiao Pei;Yize Zhang;Bin Wu
随着卫星导航系统的发展，多GNSS数据分析已成为一个新的挑战。系统偏差是Multi-GNSS数据分析中的关键问题，目前IGS界还没有推荐的模型。介绍了上海天文台GNSS数据分析中心开发的GNSS数据综合分析模型。基于上海天文台14个月的常规GNSS数据分析，详细分析了GPS/GLONASS系统的精密偏差积。结果显示：（1）同一类型接收机的系统偏差表现出相似性，而不同类型接收机的系统偏差表现出明显的差异;（2）所有台站的系统偏差变化表现出相同的模式，这表明系统偏差的长期变化是由系统时间偏移引起的;（3）系统偏差还受到天线类型的影响。推导了一个分离GPS/GLONASS观测值之间硬件延迟差（HDD）和所谓的频率间偏差（IFB）的模型。HDD和IFB时间序列的分析表明，这两项都受到接收机类型，天线类型，固件系列，电缆类型和长度的变化的影响。将该系统偏差应用于PPP定位中，GLONASS单解精度提高了55%，GPS/GLONASS组合解精度提高了30%。
Multi-GNSS data analysis has become a new challenge with the development of satellite navigation systems. System bias is the key issue in Multi-GNSS data analysis, which has no recommended models within IGS community. We introduce the integrated data analysis model developed at the GNSS data analysis center of Shanghai Astronomical Observatory (SHAO). Based on the routine GNSS data analysis at SHAO over 14 months, we analyze the precise GPS/GLONASS system bias product in detail. Results show: (1) system bias shows similarity for same type of receivers, while obvious difference are observed for different type of receivers; (2) variation of system bias shows same pattern for all stations, which indicates that the long-term variation of system bias is caused by the system time offset; (3) system bias is influenced also by type of antenna type. A model is derived to separate hardware delay difference (HDD) between GPS/GLONASS observations at the same receiver and the so-called inter-frequency bias (IFB). Analysis of the HDD and IFB time series shows that both terms are affected by the change of receiver type, antenna type, firmware series, cable type and length. Applying the system bias into PPP positioning, precision of GLONASS-only solution is improved by 55 % and precision of GPS/GLONASS combined solution is improved by 30 %.