从Lacoste－Romberg重力仪零位移特性的分析论提高观测精度的途径

THE WAY OF IMPROVING OBSERVATION PRECISION BASED ON AN ANALYSIS OF ZERO DRIFT CHARACTER OF LACOSTE-ROMBERG GRAVIMETER

零位校正误差是重力仪除标定以外最主要的误差来源。本文根据作者数年来从事高精度重力勘探工作中所积累的资料，对此问题进行了较为全面客观的分析研究。（ｌ）对Ｌａｃｏｓｔｅ－Ｒｏｍｂｅｒｇ重力仪的正常零位变化和零位突变特性提出了分析结论；（２）对实测资料采用动、静分高处理方法，分析了重力仪连续工作时（数日至数十日）由于零位非线性变化可能引起的零位校正误差；（３）通过对实测资料的分析计算，得到了零位突变对重力仪观测精度影响的参考值；（４）针对重力仪使用中的实际问题提出了改善零位移线性度的实施对策。

Besides standardization, zero correction error constitutes the most common error source of a gravimeter. Based on data accumulated in high-precision gravity elploration carried out by the authors in recent years, this paper has made a comparatively comprehensive and objective analysis and investigtion: (1) analytical conclusions were drawn on normal zero variation and zero mutation character of Lacoste-Romberg gravimeter; (2)by employing dynamic and static separate procesiug technique for measured data, the paper analysed zero correction error resulting probably from zero nonlinear variation when the gravimeter works continuously from several to tens of days; (3)through analysis and calculation of measured data, the referential values concerning the effect of zero mutation upon observation precision of the gravimeter were obtained; (4) in accordance with the practical problems arising from the use of gravimeter, the measures for improving zero drift linearity wete proposed.