用GWR-C032超导重力仪观测资料实施对LCR-ET20重力仪格值的精密测定  

Accurate Determination of the Scale Value of the LCR-ET20 Gravimeter Using Observations Recorded with the GWR-C032 Superconducting Gravimeter

作　　者：陈晓东[1] 孙和平 刘明[1] 周百力[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室,湖北武汉430077

出　　处：《测绘学报》2003年第3期219-223,共5页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金资助项目(49925411);中国科学院二期知识创新工程资助项目(KZCX3 CW 131)

摘　　要：利用我国武汉国际重力潮汐基准站GWR C032超导重力仪与LCR ET20重力仪的同址观测资料,采用多线性回归方法(Multi linearRegressionTechnique)实施了对ET20重力仪格值的精密测定,获得的格值为42.2932±0.0080×10-8m·s-2/V。为了说明获得格值的有效性,我们用获得的格值对ET20重力仪观测数据进行标定,然后进行调和分析,将分析结果与同期C032超导重力仪观测资料分析结果相比较。数值结果表明:利用ET20重力仪可获得与超导重力仪相近的潮汐参数;经海潮改正后由LCRET20重力仪获得的振幅因子与理论值之差,与由GWRC032超导重力仪获得的振幅因子与理论值之差十分接近,说明获得的标定因子可靠性。Using samesite observations obtained with the GWRC032 superconducting gravimeter and the LCRET20 gravimeter, the scale value (alias calibration factor) of the ET20 gravimeter is accurately determined with the Multilinear Regression Technique (MLRT) in this paper. The calculated scale value is 42.297 8±0.007 9 ×10-8 m·s-2/V with the accuracy of 0.02%. In order to demonstrate the validity of the determined scale value, we do harmonic analysis using the data recorded with the ET20 gravimeter and calibrated with the determined scale value. After that, comparison is done with the result calculated with the same period data of the C032 superconducting gravimeter. The numerical result shows that comparatively high precision tidal parameters can be achieved with the ET20 gravimeter, and the difference between the amplitude factors corrected by the ocean tide and the theoretical values is of the same degree comparing with those of the C032 superconducting gravimeter. The scale value calculated in this paper can be used practically to calibrate the tidal gravity observations recorded with the ET20 gravimeter.

关 键 词：LCR-ET20重力仪 多线性回归方法 格值标定 潮汐参数 潮汐 GWR-C032超导重力仪 

分 类 号：P731.23[天文地球—海洋科学] P716.81