EGM2008的GNSS高程拟合在带状工程中的应用

Application of GNSS height fitting incorporating with EGM2008 in belt engineering

以驮英水库工程为例,对比顾及EGM2008的GNSS高程拟合、单一二次多项式曲线GNSS高程拟合、使用Bruns公式求取EGM2008高程异常实现高程转换3种方法的精度,结果表明,顾及EGM2008的GNSS高程拟合精度较高,可以达到四等水准精度。提出了使用二次多项式曲线模型结合EGM2008地球重力场进行GNSS高程拟合的方法,充分利用GNSS大地高数据,降低带状工程水准测量工作量。

For Tuoying Reservoir Project, the accuracy of three height fitting methods were compared, including GNSS height fitting incorporating with EGM2008, GNSS fitting of single quadratic polynomial curve, elevation trans- formation by calculating EGM2008 height anomaly with Bruns formula. The results of comparison demonstrate that GNSS height fitting incorporating with EGM2008 has higher accuracy up to grade 4 level. The author also put forward a GNSS height fitting method combining quadratic polynomial curve model with EGM2008, which is able to reduce level survey work of belt engineering by making full use of GNSS geodetic height data.