摘要
本文分析了应用GPS技术实施跨障碍高程传递所存在的主要问题 ,提出了一种“天文GPS水准”方法 :首先采用GPS水准分别拟合障碍物两侧的似大地水准面形状 ,进而分别求得地面垂线偏差及其一次变化率 ;由于两侧所求的垂线偏差是属于同一系统的 (WGS 84) ,因此可根据天文水准原理 ,在顾及垂线偏差二次变化率的情况下 ,进一步求出跨障碍的高程异常差。根据以上设想进行的研究试验表明 ,“天文GPS水准”克服了单纯GPS水准无法连接不同高程系统的困难 。
A new method named as GPS Astronomical Leveling is presented to solve the main problems in application of GPS to height transfer across obstacle. The process is:1) to use GPS leveling to fit the local quasi geoid of each side of the obstacle; 2) to determine the vertical deflection and its gradient belonged to WGS 84 system;3) to compute height anomaly difference between both sides of the obstacle by the principle of astronomical leveling and considering gradient of vertical deflection. The study and experimentation based on the above thought show that GPS astronomical leveling is an effective and high precision method for height transfer across obstacle with long distance.
出处
《工程勘察》
CSCD
北大核心
2003年第6期40-42,49,共4页
Geotechnical Investigation & Surveying
关键词
GPS
跨障碍高程传递
垂线偏差
高程异常
天文水准
height transfer across obstacle
deflection of vertical
height anomaly
GPS astronomical leveling
