融合GNSS及改进核函数的地面沉降监测精度分析

Accuracy analysis of land subsidence monitoring by integrating GNSS and improved kernel function

为了解决地面沉降监测精度低的问题,本文提出融合GNSS及改进核函数的地面沉降监测方法。该方法通过分析GNSS高程系统,确定高程异常是影响大地高转换为正常高的主要因素,并采用改进核函数方法,通过迭代获取未知点高程异常值,实现测量过程中高程系统间的精准转换;同时,利用对流层延迟改正模型Saastamoinen来提升测量精度。试验结果表明,利用本文方法得到的地面沉降值与实际值较为接近,可明显提升地面沉降监测精度。

In order to solve the problem of low accuracy in land subsidence monitoring,this paper proposes a land subsidence monitoring method that integrates GNSS and improved kernel functions.By analyzing the GNSS elevation system,the elevation anomaly is determined to be the main factor affecting the conversion of geodetic height to normal height,and the improved kernel function method is adopted to obtain the elevation outlier of unknown points through iteration,so as to achieve accurate conversion between elevation systems in the process of surveying.At the same time,the tropospheric delay correction model Saatamoinen is used to improve surveying accuracy.The example results show that the land subsidence values obtained by the method in this paper are close to the actual values,the accuracy in land subsidence monitoring can be significantly improved.