GPS进行长边控制测量分析

An Analysis on Long-distance Control Survey by Use of GPS

采用基准和基准转换模型的不同会导致 GPS观测边长与坐标计算边长不一致。因此由 GPS测量的 WGS- 84坐标系向我国的北京 5 4坐标系转换计算时 ,应尽可能选择参考点作对比分析。若满足精度要求 ,可采用全国精密参数作转换计算 ,若不能满足精度要求或达不到实测点的点位精度 ,可先将边长作高程异常改正 ,再对起算点作方位改正。

Difference to use datum and datum transform model may result in length of side by GPS observed inconsistent with length of side by coordinates calculated So, when transforming calculation from WGS 84 coordinates measured by GPS to Beijing 54 coordinates, one should select a reference point for comparative analysis If the reference point meets with precision, then the nation precision parameter may be adopted to transform calculation If the reference point does not meet with precision or fall short of location precision of the exact measured point, the length of side should be firstly corrected for altitude anomaly, then the starting point of calculation may be made positional correctness