GPS跨河水准测量应用探讨  

Discuession of Application of GPS River-crossing Leveling

作　　者：王永乔[1] 曹赟昀 

机构地区：[1]浙江省测绘大队,浙江杭州310030 [2]浙江省第二测绘院,浙江杭州310012

出　　处：《地矿测绘》2011年第2期33-35,共3页Surveying and Mapping of Geology and Mineral Resources

摘　　要：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GPS水准测量进行跨河水准测量,其GPS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,对于超长边的跨河水准测量,可先利用GPS水准测量法进行高程测量,以满足大桥施工过程的高程需要,待大桥的优先墩造出水面之后再进行严密的跨河水准测量,以保证大桥合拢时的高程需要。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 rivercrossing 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.

关 键 词：GPS水准测量 跨河水准测量 高程异常变化率 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P224.1[天文地球—测绘科学与技术]