GNSS测量法在长距离跨海高程传递中的应用

The Application of GNSS Surveying Method in Long-distance Cross-sea Elevation Transmission

为了更高效地建立陆岛或远岛礁间的长距离高程基准联系,本文基于跨河水准测量中的GNSS测量法,通过计算高程异常的变化,在长约8.2 km和12.6 km的跨海试验场进行跨海高程传递。研究结果表明:2个跨海段采用规范中的计算手段或高差拟合分析手段,均能实现不低于三等水准测量的精度要求;其中对于10 km以下的跨海段而言,采用非跨海点间距与跨海距离大致对称相等、间距不相等但对称的布点形式或采用线性高差拟合手段,均能达到二等水准测量精度。该方法可为陆与岛、岛与岛之间高程基准联系的建立提供参考。

In order to more efficiently establish the long-distance elevation datum connection between land and islands or remote islands and reefs,cross-sea elevation transmission is performed at two cross-sea sections which spans about 8.2 km and 12.6 km,respectively,by applying GNSS surveying method during cross-river leveling and calculating elevation anomalies.The accuracy requirements of third-class leveling for two cross-sea sections can be achieved by either the calculation method in the reference standard or the height difference fitting analysis method.For the cross-sea below 10 km,the second-class leveling accuracy can be achieved when point arrangement is symmetrical(either equal-distant or not),or by using linear height difference fitting.The results could be applied as a practical reference for long-distance cross-sea elevation transmission between land and island or between island and island.