GPS跨河水准测量应用探讨

建立特大桥的施工高程控制网,在大桥一端无高等级高程控制点的情况下,要连接两岸的高程,只有采取跨河水准测量,由于跨河边较长,常规的跨河水准测量难以进行.为此,利用CPS水准测量进行跨河水准测量,其CPS高程拟合的原理是利用GPS大地高差与水准正常高差求出高程异常变化率,进而求得跨河边的正常高差.通过实例得出,对于超长边的...

Discuession of Application of GPS River-crossing Leveling

Bridge Construction to establish vertical control network of high-grade elevation at the bridge end without the control points case,and the height must connect the two shores of the river,only takes the river-crossing levelling,the longer the river-crossing’s the line of sightg,the general river-crossing leveling is more difficult.Using the principle of GPS leveling makes river-crossing leveling is feasible,the GPS elevation simulation is the use of GPS Geodetic Height difference with the high standard of normal height anomaly calculated the rate of change,and then calculated the river-crossing normal high.Through examples drawn,for the exceeded long side length of the river-crossing leveling,the first use of GPS leveling method in order to meet the elevation of the bridge construction process needs to be a priority bridge pier to water exit,and then makes leveling,to ensure the elevation of the bridge closure needs.