小面积测区内直接采用GPS坐标差的可行性研究

从理论上推证了：对小面积测区，在确保一定精度要求的情况下，不作坐标转换，直接将地面上任意两点在WGS－84坐标系中的坐标差，视为北京－54坐标系中对应两点的坐标差时，GPS网基线布设的有关问题；并对我国范围内不同测区GPS网坐标变换的问题进行了计算分析，其结果可以作为建立GPS局部工程控制网的参考。

Feasibility of Directly Utilizing GPS BaselineVectors in Local Engineering Networks

Due to the difference between WGS-84 and local or national reference systems, such as BJ-54 (Beijing System of 1954), coordinate transformation is necessary before GPS results are utilized for local engineering control. However, the transformation depends on the accurate national geodetic control points that are usually not enough or not available at all in an engineering field. The feasibility to directly utilize the GPS baseline vectors as the distances on the BJ-54 coordinate without coordinate transformation is proved by computation analysis conducted through out China. The principles to determine the proper baseline vectors are studied and presented in detail.