摘要
GPS水准无法直接应用于跨障碍高程传递,其关键原因在于障碍物两侧的高程基准不一致。为解决这一问题,文中提出了一种基于天文水准原理的新方法:首先以常规数值方法分别拟合障碍物两侧的似大地水准面形状,由此求得相对于WGS-84的地面垂线偏差值;然后根据天文水准原理,进一步计算出跨障碍的高程异常差。理论研究和实验表明,新方法克服了单纯GPS水准无法连接不同高程系统的困难,是一种有效的高精度方法。
The reason why GPS leveling can't be used for height transfer across obstacle is that the height datum of both sides of obstacle is not consistent.A new method in this paper is offered to solve the problem,which is based on astronomical leveling.First we use numerical method to fit local quasi geoid of both sides of obstacle separately,then determine surface deflections relative to WGS-84,afterwards adopt principle of astronomical leveling to compute height anomaly difference across obstacle.Theoretic study and experiment show that the new method solves the problem which simplex GPS leveling can't connect different height systems and so it is an effectively precise method.
出处
《测绘学院学报》
北大核心
2003年第3期171-173,176,共4页
Journal of Institute of Surveying and Mapping
关键词
跨障碍高程传递
垂线偏差
高程异常
GPS水准
天文水准
height transfer across obstacle
deflection of the vertical
height anomaly
GPS leveling,astronomical leveling
