共查询到17条相似文献,搜索用时 312 毫秒
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iGrav超导重力仪是当前世界上最新型的便携式相对重力仪,可提供最稳定和最高精度的连续相对重力测量。利用武汉九峰台站FG5-112绝对重力仪与iGrav-007超导重力仪连续3天的同址观测结果,基于最小二乘线性回归和迭代算法,精密确定iGrav-007的格值。数据处理结果表明,iGrav-007的格值为(-91.640 2±0.085 2)×10-8 m·s-2/V,相对标定精度为0.092 9%,连续1天的FG5绝对重力观测获得的格值精度优于0.2%,连续3天的FG5绝对重力观测获得的格值精度优于0.1%。 相似文献
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中国南极长城站绝对重力基准的建立 总被引:3,自引:1,他引:3
2004~2005年南极夏季期间,我国第21次南极科学考察队利用FG5绝对重力仪在长城站两个站点(C001和C002)进行了绝对重力测量,精度在±3×10-8ms-2以内,并同时进行了重力垂直梯度测量和水平梯度测量;利用2台LCR相对重力仪在韩国站、智利机场(2点)和菲尔德斯半岛地区的山海关、盘龙山、香蕉山、半边山等7个站点进行了高精度相对重力测量,精度达±10×10-8ms-2,并进行了相对重力仪比例因子的标定,建立了我国南极长城站地区绝对重力基准。 相似文献
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利用最新研制的一套弱力测试平台,对FG5X-246绝对重力仪观测值准确度指标进行了测试试验。通过弱力测试平台升降装置改变扰动质量体与测量点之间的距离,从而改变测量点处叠加的扰动引力场大小。通过比较FG5X-246绝对重力观测值变化量与理论扰动引力场变化量之间的差异,从而确定FG5X-246绝对重力观测值的准确度。测试结果显示当扰动质量体从1.810 4 m高度降到1.409 9m高度时,外部扰动引力场变化了48.81 μGal(1Gal=1cm/s~2),FG5X-246绝对重力仪感应到48.0 μGal的重力变化,FG5X-246绝对重力仪测量值与理论值之差为0.81 μGal。当扰动质量体从1.810 4m降到1.010 1m高度时,外部扰动引力场变化了-15.44 μGal,FG5X-246绝对重力仪感应到-16.20 μGal的重力变化,测量值与理论值之差为0.76 μGal。当扰动质量体从1.409 9 m降到1.010 1m高度时,外部扰动引力场变化了-64.20 μGal,FG5X-246绝对重力仪感应到-64.25 μGal的重力变化,测量值与理论值之差为0.05 μGal。上述测量结果表明,此次FG5X-246绝对重力仪感应到外部引力变化的误差均不超过1 μGal,即其测量值准确度优于1 μGal。 相似文献
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The scale factor of a superconducting gravimeter (SG) at the Esashi Earth Tides Station, Japan, was revised by repeating co-located absolute gravity measurements with an FG5 gravimeter. Although the calibration results from the absolute gravimeter (AG) show an apparent secular change in the scale factor of the SG (0.4% for the period 1993–2002), the relative scale factors, which are determined by tidal analysis with the response method, indicate that it has changed by no more than 0.01% during the above period. If the mean scale factor over the 10 years is adopted, a value of –56.082±0.029 Gal/V (1 Gal =10–8 m s–2) is obtained, which is about 0.4% smaller than that used in the global geodynamics project (GGP) database. Based on this newly determined scale factor, the tidal gravity factors at Esashi have been re-estimated. The observed tidal factors, corrected for the ocean tide effects with recent models, indicate that the theoretical gravity factors for an inelastic Earth model are more consistent with the observations than are those for an elastic model. 相似文献
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This paper introduces the comparison of absolute gravity measurements in China during 2006–2008, and analyzing the survey and comparing the results, it shows that there is no obvious system error between the gravimeter of FG5/214 and FG5/232, the surveying accuracy is very high and repetition is good, and their inner surveying accuracy is about 2–3 microGal. 相似文献
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FG5/232与FG5/214绝对重力观测比对(英文) 总被引:6,自引:0,他引:6
This paper introduces the comparison of absolute gravity measurements in China during 2006-2008,and analyzing the survey and comparing the results,it shows that there is no obvious system error between the gravimeter of FG5/214 and FG5/232,the surveying accuracy is very high and repetition is good,and their inner surveying accuracy is about 2-3 microGal. 相似文献
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