我国重力基本网若干技术问题

本文介绍我国新的国家重力基本网1985系统(新网)。新网由57个点组成,其中包括6个绝对重力点,用拉科斯特·隆贝格(LCR—G)重力仪进行相对观测,并与国外多个已知重力基准系统作了联测,共获得各类观测数据近万个。新网重力值平均中误差为±8微伽10~(-8)ms~(-2)],经外部检核,实际精度达20微伽。1985年通过国家鉴定。经过两年来使用证明,新网达到设计要求,具有国际先进水平。本文还讨论了重力网平差、我国旧网精度及转换、LCR—G重力仪的特性和国际重力基准等问题。

SOME TECHNICAL PROBLEMS ON CHINA GRAVITY BASIC NET

This article addresses the China Gravity Basic Net 1985 system(CGBN85) CGBN85 consists of 57 gravity stations,six of them being absolute gravity stations.It was measured with LaCoste-Romberg gravimeter model G (LCR-G),and was connected with several existing international stan- dard systems.In total,about 10,000 observation data were obtained. Through gravimetric practices for two years,it is shown that CGBN85, with an internal accuracy of ±8 microgal10~(-8)ms~(-2)],meets the requi- rements of modern geoscience.