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| A real-time gravity gradient demodulation method for airborne gravity gradiometers |
QIAN Xue-Wu1,2( ), ZHAO Li-Ye1(), YIN Hang3 |
1. School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
2. School of Electronic Engineering,Jinan Vocational College,Jinan 250103,China
3. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China |
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Abstract To further improve the precision of gravity gradient measurement, this study proposed a method for real-time phase angle compensation of gravity gradient demodulation and real-time processing of gravity gradients. Firstly, this study determined the process and formula used to determine the phase angles for gravity gradient demodulation based on the structural features of the gravity gradiometer prototype. Then, it investigated the method for real-time gravity gradient demodulation and determined the formula. Finally, this study carried out simulation experiments using the hardware-in-the-loop simulation platform of gravity gradient signals. The simulation results show that the method proposed in this study can significantly improve the precision of gravity gradient measurement and can be applied to engineering. Therefore, this study can provide technical references for the development of airborne gravity gradiometers.
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Received: 05 January 2022
Published: 03 January 2023
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Corresponding Authors:
ZHAO Li-Ye
E-mail: sdqxwu@163.com;liyezhao@seu.edu.cn
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Schematic of the rotating accelerometer gravity gradiometer
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Schematic of the gravity gradient demodulation phase angle
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Structure of the real-time gravity gradient demodulation for the airborne gravity gradiometer
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Hardware-in-the-loop simulation platform of the gravity gradiometer
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Comparison of gravity gradient demodulation phase angle before and after zero-phase filtering
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Comparison of the gradient component (Гyy-Гxx) before and after phase compensation
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Comparison of the gradient component Гxy before and after phase compensation
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