绝对重力仪研制中仪器测量高度的计算

发布时间：2018-05-07 23:15

本文选题：绝对重力仪 + 有效高度　；参考：《武汉大学学报(信息科学版)》2017年12期

【摘要】：在激光干涉绝对重力仪的研制中,每次测量落体都要自由下落7~20cm的距离,在此过程中地表重力垂直梯度引入的误差最高可达60×10-8 m/s2。因此,需要计算出每次测量值对应的测量高度,即在该位置时,落体运动的距离内重力垂直梯度对绝对重力测量值的综合误差为零。基于对落体下落运动方程的分析,提出一了种新的绝对重力仪测量高度的计算方法。对比发现,当起始计算时间较小并接近于0(小于0.015s)时,该算法与已有的算法结果具有较好的一致性,最大偏差不大于3 mm,梯度归算误差不大于1×10-8 m/s2(μGal)。在仪器自主研发的过程中,当起始计算时间较长(大于0.015s)时,该算法可以更合理地计算绝对重力测量值对应的测量高度。
[Abstract]:In the development of absolute gravimeter with laser interference, the distance of falling body must be free falling 7~20cm every time. In this process, the error caused by vertical gradient of surface gravity can be up to 60 脳 10 ~ (-8) m / s ~ (2). Therefore, it is necessary to calculate the measuring height corresponding to each measured value, that is, at this position, the comprehensive error of the vertical gradient of gravity within the distance of falling body motion to the absolute gravity measurement value is zero. Based on the analysis of the falling motion equation, a new method for calculating the height measured by absolute gravimeter is proposed. It is found that when the initial computing time is small and close to 0 (less than 0.015 s), the proposed algorithm is in good agreement with the existing results, the maximum deviation is less than 3 mm, and the gradient reduction error is less than 1 脳 10 ~ (-8) m / s ~ (2) (渭 GalN). In the process of independent development of the instrument, when the initial calculation time is longer than 0.015 s, the algorithm can more reasonably calculate the measured height corresponding to the absolute gravity measurement value.
【作者单位】：中国地震局地球物理研究所;防灾技术学院;
【基金】：国家重大科学仪器设备开发专项(2012YQ10022501)~~
【分类号】：P223.1

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