我国国家重力网的系统转换

本文分析了我国１９５７年国家重力网的精度和问题，探讨了国家重力网的系统转换模式，利用现有的新旧重力网的重合点实际数据进行了回归分析、方差分析和系统误差检验，结果表明在“５７网”与“８５网”之间，除了—１３．５８ｍｇａｌ的平均基准差之外，并不存在其它明显的系统误差，特别是看不出有尺度系统差的影响，也不存在差值随纬度变化的任何规律。因此认为将“５７网”系统转换成“８５网”系统时，可以不必加“尺度系统差改正”，更不用考虑“非线性系统差改正”，建议一律只加一项“基准系统差改正”，其数值应该采用—１３．５８ｍｇａｌ。

The National Gravity Net Transformation in China

This paper deals with the accuracy and the problems of The Chinese National Gravity Standardization Net-1957 (CGSN57). The transfprtnation model of the chinese gravity nets is discussed as well. The available data of common points in both the old and the new nets are used to perform the regression. covariance analysis and systematic error tests. The results show that only a-13. 58 mgal-sized datum shift exists between the CGSN57 and CGSN85. No other systematic errors. such as scale and the latitude-dependent variation error. are significantly indicated. This suggests that it is unnecessary to take the scale error and the nonliear error into account except the datum shift of-13. 58 mgal. in order to carry out the transformation between the 1957-and 1985-national gravity nets.