| LaCoste&Romberg航空重力仪K因子的动态标定及其特性研究 |
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| 引用本文： | 孙中苗,夏哲仁,王兴涛,李迎春.LaCoste&Romberg航空重力仪K因子的动态标定及其特性研究[J].地球物理学报,2007,50(3):724-729. |
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| 作者姓名： | 孙中苗 夏哲仁 王兴涛 李迎春 |
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| 作者单位： | 西安测绘研究所，西安710054 |
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| 基金项目： | 地球空间环境与大地测量教育部重点实验室开放基金项目（905152533-05-05）资助. |
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| 摘 要： | 摆杆尺度因子（K因子）是反映LaCoste&Romberg航空重力仪线性响应特性的最重要参数. 利用基于地面参考数据的外部标定法和基于交叉点不符值的内部标定法分别对其进行了标定，实测数据分析表明，K因子的内、外部标定结果非常一致，且利用新K因子计算的空中重力扰动，其精度较采用出厂值提高了02～04 mGal. 内部标定法具有较好的实际应用价值. 研究了K因子与滤波尺度的相关性，表明重力仪可能为一非线性响应系统，即K因子的大小与摆杆速度的变化有关.
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| 关 键 词： | 航空重力测量 航空重力仪 滤波尺度 摆杆尺度因子(K因子) |
| 文章编号： | 0001-5733（2007）03-0724-06 |
| 收稿时间： | 2006-06-30 |
| 修稿时间： | 2006-06-30 |
Dynamic calibration and properties investigation of the K-factor for LaCoste&Romberg airborne gravimeter |
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| SUN Zhong-Miao, XIA Zhe-Ren, WANG Xing-Tao, LI Ying-Chun.Dynamic calibration and properties investigation of the K-factor for LaCoste&Romberg airborne gravimeter[J].Chinese Journal of Geophysics,2007,50(3):724-729. |
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| Authors: | SUN Zhong-Miao XIA Zhe-Ren WANG Xing-Tao LI Ying-Chun |
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| Institution: | Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China |
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| Abstract: | The beam scale factor (called K factor) is the most important parameter that characterized the linear property for the LaCoste&Romberg airborne gravimeter. The K factor is recalibrated by minimizing the difference between airborne data and upward continued surface data (external calibration) and by minimizing the errors at line crossings (internal calibration) respectively. The numerical tests show that the results of these two calibration methods are almost identical and the accuracy of the airborne gravity disturbance is improved about 02～04 mGal by using of the new K factor. The internal calibration will be useful and valuable. Also, the dependence of the K factor on the amount of the filtering applied to the data is discussed. It is shown that the gravity sensor may be a nonlinear system, namely the K factor is seen to be dependent on the beam velocity. |
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| Keywords: | Airborne gravimetry Airborne gravimeter Filtering amount Beam scale factor (K-factor) |
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