国际绝对重力仪比对述评   总被引：1，自引：0，他引：1       下载免费PDF全文

李德禧 《地球物理学报》1988,31(2):231-235

本文述评了各国绝对重力仪过去历次国际比对结果,并对今后国际大比对提出某些建议。  相似文献   

Gravity measurements with a portable absolute gravimeter A10 in Syowa Station and Langhovde,East Antarctica     

Takahito Kazama  Hideaki Hayakawa  Toshihiro Higashi  Shingo Ohsono  Shunsuke Iwanami  Tomoko Hanyu  Harumi Ohta  Koichiro Doi  Yuichi Aoyama  Yoichi Fukuda  Jun Nishijima  Kazuo Shibuya 《Polar Science》2013,7(3-4):260-277

Absolute gravity values were measured with a portable absolute gravimeter A10 in East Antarctica, for the first time by the Japanese Antarctic Research Expedition. This study aims to investigate regional spatiotemporal variations of ice mass distributions and associated crustal deformations around Syowa Station by means of repeated absolute gravity measurements, and we obtained the first absolute gravity value in Southern Langhovde on the Antarctic Continent. The average absolute gravity value at the newly installed benchmark AGS01 in Langhovde (obtained on 3 February 2012) was 982535584.2 ± 0.7 μgal (1 [μgal] = 1 × 10^?8 [m/s²]), which was in agreement with the gravity values obtained by the past relative gravity measurements within 1 mgal. In addition, the average absolute gravity value obtained at AGSaux in Syowa Station was consistent with both previous absolute gravity values and those obtained by simultaneous measurements using an FG5 gravimeter, owing to adequate data corrections associated with tidal effects and time variations in atomic clock frequencies. In order to detect the gravity changes associated with the ice mass changes and other tectonic phenomena, we plan to conduct absolute gravity measurements at AGS01 again and at other campaign sites around Syowa Station as well in the near future, with careful attention paid to the impacts of severe environmental conditions in Antarctica on gravity data collection.  相似文献   

一种新的重力潮汐数据预处理和分析方法   总被引：11，自引：3，他引：8  

陈晓东  孙和平 《大地测量与地球动力学》2002,22(3):83-87

较系统地介绍了由比利时皇家天文台Ｖauterin博士研制的Tsoft重力潮汐数据预处理方法和由日本国立天文台Tamura博士研制的Baytap-G潮汐数据分析方法。作为应用，利用武汉九峰动力大地测量学观测站超导重力仪1999年观测数据，先实施预处理，再作数据分析，获得地球潮汐常数。数值结果说明，利用Tsoft方法可有效消除各种干扰信号，由Baytap-G分析方法得到的潮汐参数精度与目前国际上通用的Eterna方法获得的潮汐参数精度相当。  相似文献   

便携式重力固体潮数字化数据采集系统     

刘冬至  李树德  李辉  李家明  王晓权  喻节林 《大地测量与地球动力学》2004,24(3):115-120

概述了线性静电反馈的基本原理。LCR G型重力仪进行线性静电反馈自动平衡的技术改造后 ,分辨率由原来的 0 .0 1× 10 -5ms-2 提高到 0 .0 0 1× 10 -5ms-2 ,与DZCW 1型智能化重力数据采集控制仪、计算机等一起组成便携式重力固体潮数字化数据采集系统。系统可进行数据实时处理、图像显示和数据传输。试验结果表明 :系统性能稳定、可靠 ,操作方便、灵活、快捷 ,可用于监测重力场在时空上的连续变化  相似文献   

LCR-G型重力仪仪器参数的时变特征   总被引：6，自引：5，他引：1  

孙少安  项爱民  吴维日 《大地测量与地球动力学》2002,22(2):101-105

采用区域适定法对LCR－G型重力仪的仪器参数进行适时标定。对标定结果的分析表明：（1）区域适定法标定结果与基线标定结果精度相当；（2）重力仪的线性项参数呈现随时间的趋势性下降和非线性。采用区域适定解校正后的线性项参数处理区域重力网的观测资料，不仅能有效地削弱系统误差，而且可提高重力仪检测地震信息的能力。  相似文献   

重力仪一次项系数对重力场动态变化的影响研究   总被引：1，自引：0，他引：1  

梁伟锋  刘芳  祝意青  徐云马  郭树松  赵云峰  刘练 《大地测量与地球动力学》2015,35(5):882-886

利用2011~2013喜马拉雅项目在南北地震带北段获得的10余个绝对重力值作为基准,运用甘肃、宁夏和河西3个重力网的数据对各重力仪一次项系数进行重新解算,获得重力场动态变化。结果显示:1)2011-05~2013-06的重力场反映出,青藏高原深部物质向北东运移过程中出现自西南向东北、由负向正的大空间尺度趋势性显著重力变化;2)LCR-G型及Burris型金属弹簧重力仪的一次项较稳定,基本不变,而CG-5型石英弹簧重力仪的一次项逐年减小,应每年利用绝对基准进行实测标定;3)利用绝对基准进行实测一次项标定后,重力场总的变化趋势与利用长基线标定的一次项计算结果基本一致,只是量级有所减小。  相似文献   

国产零长弹簧原理动态重力仪首次飞行试验及精度评估     

翟振和  范昊鹏  管斌  马健  段渭超 《测绘通报》2021,(2):68-71

CHZ-Ⅱ重力仪是首套完全国产零长弹簧原理航空重力仪,2018年4月在陕西渭南地区进行了首次飞行试验,共完成4个架次24条测线的有效飞行,标志着我国航空重力仪在自主研发的道路上又取得了长足的进步。利用飞行地区地面重力数据对CHZ-Ⅱ重力仪的测线扰动重力和格网扰动重力数据进行精度评估,其中空中测线在10 km分辨率条件下,精度达到1 mGal。采用地形辅助法对测量形成的5'测格网重力数据进行向下延拓,经延拓至地面后精度优于5 mGal,基本满足平原地区的测量需求。  相似文献   

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邢乐林  申重阳  李辉  O.Francis 《大地测量与地球动力学》2009,29(3):77-79

????2007??11????????Walferdange???????ξ????????????????????????????????????????????20???????????μ?????????ECGS??15??????????????????С??2.1??10 ^-8 ms ^-2??  相似文献   

High-frequency parasitic modes of superconducting gravimeters     

Yuichi Imanishi 《Journal of Geodesy》2009,83(5):455-467

The superconducting gravimeter (SG) has a long-period instrumental noise called the parasitic mode at periods around 100 s, whose precise mechanism has not yet been identified. In this paper, another instrumental noise is detected at much higher frequencies by analyzing the high-rate gravity channel of two SGs in Japan. This is also a parasitic oscillation, characterized by frequencies on the order of 1 Hz and very high Q values. Detailed spectra indicate that the noise actually consists of two modes with small frequency separations. Based on a simple theory on the rotational motions of the superconducting sphere in the gravity sensor, the observed modes are tentatively identified as rotational oscillations of the sphere about two orthogonal axes in the horizontal plane. Interactions between the parasitic modes are investigated using the spectra acquired on an earthquake, to conclude that the low-frequency parasitic mode is likely to be a rotational motion of the sphere about the vertical axis.  相似文献   

FG5绝对重力仪     

王勇  张为民 《大地测量与地球动力学》1996,(2)

介绍了ＦＧ５型绝对重力仪的发展历史和一些技术特点，并报道了ＦＧ５／１１２型绝对重力仪在我国的观测结果。  相似文献