GPS公路勘测首级控制网的建立

Establishing GPS Highway Survey Framework

目前较大规模的公路勘测首级控制网的建立均采用GPS测量的方法。本文在简要介绍了GPS公路勘测首级控制网建立的特点及作业流程后,着重讨论了此类GPS控制网建立过程中几个主要技术问题的解决方法,即用坐标转移法进行偏心观测、用尺度强制约束法或投影面重新选择法处理投影变形和内业平差的优化处理方法。工程实践表明,此法不但能满足精度要求,而且简化了外业工作量,具有方便、快捷等优点,有较好的工程实用价值。

At the present time,GPS has been used in establishing highway survey framework.This paper first introduces the features and performance diagram of highway survey framework,then lays stress on some technical issues,i.e.reduction procedure of GPS offset observation,the processing of projective deformation and the adjustment optimal process.The engineering practice indicates that the method is good in meeting with the requirements for accuracy,and has such advantages of easy to use and to facilitate engineering work.