微量沉降背景下地面沉降GPS测量最佳观测时段研究  

Optimal observation period of GPS land subsidence measurements in the context of micro-subsidence

作　　者：熊福文 XIONG Fuwen(Key Laboratory of Land Subsidence Monitoring and Prevention,Ministry of Natural Resources,Shanghai 200072,China;Shanghai Institute of Geological Survey,Shanghai 200072,China;Shanghai Engineering Research Center of Land Subsidence,Shanghai 200072,China)

机构地区：[1]自然资源部地面沉降监测与防治重点实验室,上海200072 [2]上海市地质调查研究院,上海200072 [3]上海地面沉降控制工程技术研究中心,上海200072

出　　处：《上海国土资源》2020年第1期74-79,共6页Shanghai Land & Resources

基　　金：国土资源部公益性行业科研专项经费项目(200811095);上海市科学技术委员会科研项目(18DZ1201100);国际地球科学计划项目(IGCP project No.663);上海市领军人才基金项目“新成陆地区地面沉降机理与安全预警研究”。

摘　　要：基于2009-2010年上海GPS CORS静态观测数据,编制14套不同时段长度计算方案,通过比较GPS基线垂向分量重复性,对最佳观测时段长度、最佳观测季节进行研究。研究表明:在基线平均边长47.0km地面沉降区域最佳观测时段长度选定为24小时比较适合,同时初步发现一年中第一季度地面沉降GPS测量垂向精度最高;多年GPS实测垂向精度±5mm左右的外符合精度一定程度上验证了24h垂向重复性±3.79mm内符合精度。文中研究了在上海微量沉降背景下开展GPS测量的策略,对融合北斗、GLONASS、Galileo等多星座GNSS数据处理方案、大汽对垂向精度影响、长三角地面沉降联防联控CORS骨干监测网建设进行探讨,研究方法和结论对相关研究有参考意义。This study employs Shanghai GPS continuously operating reference station(CORS)static observation data from 2009–2010 to prepare 14 sets of calculation schemes with different period lengths.Then,the optimal observation period length and season is compared by comparing the repeatability of the GPS baseline vertical components.The optimal observation period length of the ground subsidence area with an average baseline length of 47.0 km is determined as 24 h.Moreover,the GPS vertical accuracy of ground subsidence is highest in the first quarter of the year.The accuracy of the external coincident of approximately±5mm verifies the accuracy of the 24-h vertical repeatability to within±3.79 mm.The applicability of performing GPS measurements in the context of Shanghai micro-subsidence is also evaluated.The approach integrates multi-constellation GNSS data processing schemes such as Beidou,GLONASS,Galileo,etc.,the influence of water vapor content on vertical accuracy,and the construction of a CORS backbone monitoring network for the joint control of Yangtze River Delta land subsidence.The methods and conclusions of this study have important reference significance for related research.

关 键 词：地面沉降 微量沉降 沉降监测 GPS测量 GPS连续运营参考站(GPS CORS) 最佳观测时段 

分 类 号：P228.4[天文地球—大地测量学与测量工程]