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| 引用本文： | 杨厚丽,邹彤,郭唐永,刘延飞.????????????????????????????[J].大地测量与地球动力学,2015,35(2):346-348. |
| 作者姓名： | 杨厚丽 邹彤 郭唐永 刘延飞 |
| 作者单位： | 1〓中国地震局地震研究所(地震大地测量重点实验室)，武汉市洪山侧路40号，430071 2〓中国地震局地壳应力研究所武汉科技创新基地，武汉市洪山侧路40号，430071 |
| 基金项目： | 国家科技部高精度绝对重力仪研制与产业化示范项目（2012YQ100225） |
| 摘 要： | ?????????????????????????????????????????????????????????????????????и??????????????????????????????λ??????????????????????????÷??????????????????????g?????????????????÷?????????????10??3?? μGal?????????????? |
| 关 键 词： | ?????????? ?????????? ?????? ????? ????????? |
| 收稿时间： | 2014-06-04 |
Complex Heterodyne Method for Digital Fringe Signal in an Absolute Gravimeter |
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| YANG Houli,ZOU Tong,GUO Tangyong,LIU Yanfei.Complex Heterodyne Method for Digital Fringe Signal in an Absolute Gravimeter[J].Journal of Geodesy and Geodynamics,2015,35(2):346-348. | |
| Authors: | YANG Houli ZOU Tong GUO Tangyong LIU Yanfei |
| Institution: | 1〓Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA,40 Hongshance Road, Wuhan 430071, China 2〓Wuhan Base of Institute of Crustal Dynamics, CEA, 40 Hongshance Road, Wuhan 430071, China |
| Abstract: | In this paper, the complex heterodyne method is studied to analyze the fringe signal produced during free fall movement in an absolute gravimeter. Firstly, it is necessary to perform a series of complex heterodyne on the high-speed sampling signal in order to iteratively reduce the bandwidth and to move it to dc. Secondly, initial velocity and acceleration can be estimated and a nonlinear fit is used to obtain a acceleration of gravity g. Simulation results with MATLAB indicate that the fit residuals can reach 10－3 μGal level and this ensures accuracy of measurement. |
| Keywords: | absolute gravimeter: digital fringe signal high-speed frequency-sweep complex heterodyne nonlinear fit |
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