PPP网解UPD模糊度固定技术监测尼泊尔Ms8.1级地震对中国珠峰地区及周边地震同震位移

利用UPD模糊度固定技术无需顾及基线解算基站地震所带来的影响,可以进行高精度非差PPP解算,"真实"获取地震周边地区GNSS站点高精度同震位移变化。为此,本文利用"国家基准一期工程""中国大陆构造环境监测网络"以及国家测绘地理信息局在珠峰周边所观测的GNSS观测资料,基于UPD模糊度固定技术高精度非差解算2015年4月25日尼泊尔Ms8.1级地震对我国珠峰地区及周边地震同震位移影响。首先,本文选取全国及周边IGS均匀分布、站点稳定、远离震区的GNSS连续观测网络数据计算卫星端的宽、窄巷UPD,采用PPP网解UPD模糊度固定技术,对解算地震区域内的GNSS测站的载波相位模糊度进行固定,得到无模糊度的精确相位观测值,进行高精度非差PPP解算;通过对平静日IGS测站数据处理与ITRF2008历元坐标对比分析,验证了该方法的精确性;最后,对2015年4月25日、5月12日地震以及地震前后数据,进行了UPD模糊度固定技术的非差PPP解算,分析了中国珠峰地区及周边GNSS站的同震位移;同时也分析了中国珠峰地区在2005—2015年10年的位移变化情况。UPD模糊度固定技术整网解算的方法也证实了能够为GNSS用于监测地震同震位移等,提供了一种精确、可靠的技术手段。

Co-seismic Displacement of the 25 April 2015 Nepal Ms8.1 Earthquake Effects on the China's Mount Everest Area Derived from GNSS Data Using the PPP Network Solution by UPD Ambiguity Fixed Technology

Co-seismic displacement of the GNSS stations in areas surrounding the earthquake are accurately obtained using UPD (uncalibrated phase delay) ambiguity fixed technology without having to consider the effects of earthquake on the GNSS baseline calculating.During the 25 April 2015 Nepal Ms8.1 seismological GNSS data from the National Datum Engineering of China, the Crustal Movement Observation Network of China and the Mount Everest GNSS stations are calculated using UPD ambiguity fixed technology, then co-seismic displacement field of the China's Mount Everest and surrounding areas are derived and analyzed.Firstly, the UPD of wide-lane and narrow lane are estimated using the uniform distribution National GNSS and the surrounding IGS stability stations away from the seismic zones.Secondly, the float carrier phase ambiguities from each GNSS station in the seismic zones are fixed using the UPD of wide-lane and narrow until all the GNSS station are completed.Then whole network GNSS station coordinates are just only estimated using the accurately phase observations without ambiguity form all the GNSS stations.The GNSS data from IGS stations are used to verify the precision of the above method.Finally, Co-seismic displacement field of the China's Mount Everest are derived and particularly analyzed.From 2005 to 2015 year the displacement of China's Mount Everest are showed.Meanwhlile, this paper provides a precise and reliable method to monitor earthquake.