摘要
为了国土资源调查和防洪防灾,在长江中游建立了大地形变GPS监测网,以监测水患区的构造沉降。顾及到对流层延迟的影响,实测了每个测站处的气象数据。在GPS监测网的数据处理中,采用Saastamoinen模型来计算对流层延迟的干分量,而对流层延迟中的湿分量,用分段线性方法进行估计,以提高GPS高程分量的精度。GPS监测网基线的重复精度优于10-8,GPS监测网的点位水平中误差均优于±2.6mm,高程均优于±3.3mm,平差后基线边相对精度优于10-8量级。研究表明,GPS监测网的精度达到并完全满足了大地形变监测的精度要求,可为地质调查和灾害防治提供准确的垂直变形信息。
In order to investigate land resources and prevent flood and disaster, a GPS geotectonic deformation-monitoring network was established to monitor the tectonic subsidence of the flooded area in the middle reaches of the Changjiang River. Considering the affect of tropospheric delay, the meteorologic data at every site were surveyed. The Saastamoinen model was adopted to compute the dry component parts of the tropospheric delay in the data processing of GPS monitoring network. The wet components of the tropospheric delay were estimated by using the piece wise linear method for improving the precision of GPS height components. The repeatability of all baselines of GPS monitoring network was superior to 10^(-8) level. The horizontal RMS(root mean square) errors of all monitoring points were superior to (±2.6 mm) and the height RMS errors of all monitoring points superior to (±3.3 mm). The relative accuracies of all baselines after adjustment were superior to 10^(-8) level. The research indicates the accuracy of the GPS monitoring network can be achieved and satisfy completely the accuracy requirement of the geotectonic deformation monitoring. It can offer the exact vertical deformation information for the geological investigation and preventing disaster.
出处
《长江科学院院报》
CSCD
北大核心
2005年第1期28-31,共4页
Journal of Changjiang River Scientific Research Institute
基金
国土资源部科技基金资助项目(214151900)
关键词
长江中游
大地形变
GPS监测
精度分析
middle reaches of the Changjiang River
geo-tectonic deformation
GPS monitoring
precision analysis
