| 基于绝对重力基准控制的流动重力观测资料动态平差方法研究 |
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| 引用本文： | 康开轩,李辉,申重阳,孙少安,郝洪涛.基于绝对重力基准控制的流动重力观测资料动态平差方法研究[J].大地测量与地球动力学,2015,35(3):508-511. |
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| 作者姓名： | 康开轩 李辉 申重阳 孙少安 郝洪涛 |
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| 摘 要： | 选取滇西重力测网1986~2009年流动重力观测资料及下关、丽江、昆明3个绝对重力基准点多年复测资料作基准控制,采用线性速率模型拟合观测过程中重力场的时变信息,建立绝对重力基准点约束下的动态平差模型,讨论段差观测值及绝对重力基准观测值协方差矩阵的构建、平差模型初值选取及迭代计算等细节问题。经分析,测区内测点的重力年变率范围为(-0.039 5~0.024 1)×10-5 ms-2/a,精度范围为(0.001~0.029 8)×10-5 ms-2/a,与分期静态平差拟合结果的差异约为(0.003~0.020)×10-5 ms-2/a。在处理全国网和较大面积的区域网多年重复观测的重力资料时,尤其是多网多期重力资料联合处理时,应采用动态平差模型来获得统一时间基准和空间基准的重力变化。
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| 关 键 词： | 流动重力观测 动态平差 重力年变率 绝对重力基准 时间基准 |
Method of Dynamic Adjustment on Repeated Gravity Measurements
under the Constraint of Absolute Gravity Observations |
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| KANG Kaixuan,LI Hui,SHEN Chongyang,SUN Shaoan,HAO Hongtao.Method of Dynamic Adjustment on Repeated Gravity Measurements
under the Constraint of Absolute Gravity Observations[J].Journal of Geodesy and Geodynamics,2015,35(3):508-511. |
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| Authors: | KANG Kaixuan LI Hui SHEN Chongyang SUN Shaoan HAO Hongtao |
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| Abstract: | 〗In this paper we use the repeated gravity measurements of the western Yunnan gravity network with the data length of 1986-2009, as well as absolute gravity observations at Xia Guan, Li Jiang, and Kun Min gravity sites. Linear gravity rate models are employed to estimate the time variation geophysical information. We build dynamic adjustment models under the constraints of absolute gravity observations, and discuss several key questions including the variance metric for both repeated and absolute gravity measurements, the initial values of the models and the iterations’,robust estimation, and statistic hypothesis testing. We obtain the annual gravity rate at each site in the western Yunnan network with a range of (-0.039 5-0.024 1)×10-5ms-2/a, and the precision with a range of (0.001-0.0298) ×10-5ms-2/a, with the difference of (0.003-0.020)×10-5ms-2/a, as compared with the static adjustment method. When we process the national gravity network or the regional gravity network over a relatively large area, especially with multi-network and multi-campaign gravity measurements, the dynamic adjustment model developed in this work can obtain the gravity variation under the united space-time status. |
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| Keywords: | repeated gravity measurements dynamic adjustment gravity annual rate absolute gravity status temporal base |
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