GPS网已知点粗差对转换参数的影响

坐标转换时，若已知点含有粗差将不能获得正确的转换参数，已知点粗差是如何影响转换参数的，其量级是多少，本文将在此方面作深入分析。通过分析可知，粗差越大，粗差对转换参数的影响越大；测区越大，粗差对转换参数的影响越大；如果给已知点坐标加一个很大的常数，转换参数将发生剧烈变化。并用实例对本文的分析作了验证。

On the Influence of Gross Errors of Known Points in GPS Network

The correct transform parameters of two coordinate systems cannot be obtained while known points contain gross errors.Unfortunately,how gross errors of known points destroy the reliability of transform parameters,i.e.,the mode and magnitude are not analyzed up to now.Further discussion of the influence of gross errors of known points is presented in this paper.The gross errors not only change the scale and the circumrotate parameters,but change the vector of two coordinate systems,the bigger the gross errors,the greater the magnitude,and the larger the control network,the greater the magnitude.If a big constant data is added to the coordinate of known point,the transform parameters will be changed greatly.A field example is used to validate the analysis in this contribution.