| 网形结构对重力数据分析结果的影响 |
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| 引用本文： | 隗寿春,祝意青,梁伟锋,赵云峰,李 杰,艾力夏提·玉山.网形结构对重力数据分析结果的影响[J].大地测量与地球动力学,2018,38(10):1063-1067. |
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| 作者姓名： | 隗寿春 祝意青 梁伟锋 赵云峰 李 杰 艾力夏提·玉山 |
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| 摘 要： | 为分析网形结构对重力网平差结果的影响，利用北天山测网改造后的最新4期流动重力观测数据，分析测网中存在长支线对整网数据处理结果的影响。结果显示，长支线的存在使北天山最大异常变化达到260 μGal。将支线连成闭合环再进行平差计算，得到的最大重力变化量减小到60 μGal，表明测线上的误差积累导致支线末端测点重力值可靠性差，严重影响异常重力变化的识别。由于观测原因形成长支线时，为正确识别异常信息，采取适当的数据处理方法，将支线连接成闭合环，可以有效提高测网整体平差结果的可靠性。
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| 关 键 词： | 北天山 网形结构 支线 重力网平差 |
Impact on Gravity Data Analysis of Network Structure |
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| WEI Shouchun,ZHU Yiqing,LIANG Weifeng,ZHAO Yunfeng,LI Jie,HUSAN Irxat.Impact on Gravity Data Analysis of Network Structure[J].Journal of Geodesy and Geodynamics,2018,38(10):1063-1067. |
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| Authors: | WEI Shouchun ZHU Yiqing LIANG Weifeng ZHAO Yunfeng LI Jie HUSAN Irxat |
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| Abstract: | In order to discuss the impact on the adjustment of gravity network structure, the latest four groups gravity data of the upgraded northern Tianshan gravity network are used to analyze the impact of the long open line in gravity network. The results show that the existence of long open line in the gravity network brings the maximum gravity change is up to 260 μGal. Meanwhile, when the open lines are converted into a closed loop, the maximum is 60 μGal. Therefore, accumulation of error on the open line causes unreliable gravity value on the station at the end of the open line. Consequently, the identification of anomalous gravity change will be seriously affected. In order to improve the reliability of adjustment result effectively, proper data processing method is adopted to convert the open lines into a closed loop, when some long lines exist in gravity network owing to the observation work, helping to identify anomaly information. |
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| Keywords: | northern Tianshan network structure open line adjustment of gravity network |
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