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260μGal。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60μGal,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。
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 260μGal.Meanwhile,when the open lines are converted into a closed loop,the maximum is 60μGal.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.
作者
隗寿春
祝意青
梁伟锋
赵云峰
李杰
艾力夏提·玉山
WEI Shouchun;ZHU Yiqing;LIANG Weifeng;ZHAO Yunfeng;LI Jie;HUSAN Irxat(The Second Monitoring and Application Center,CEA,316 Xiying Road,Xi’an 710054,China;State Key Laboratory of Geodesy and Earth’s Dynamics,Institute of Geodesy and Geophysics,CAS, 340 Xudong Street,Wuhan 430077,China;Earthquake Administration of Xinjiang Uyghur Autonomous Region,338 Second\|Kexue Street,Urumqi 830011,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2018年第10期1063-1067,共5页
Journal of Geodesy and Geodynamics
基金
项目来源:国家自然科学基金(41874092,61627824)
大地测量与地球动力学国家重点实验室开放基金(SKLGED2018-2-1-E)
中国地震局“三结合”课题(CEA-JC/3JH-173803)。
关键词
北天山
网形结构
支线
重力网平差
northern Tianshan
network structure
open line
adjustment of gravity network
