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Study on the CHZ-II Gravimeter and Its Calibrations along Forward and Reverse Overlapping Survey Lines
Haibo Tu1, Kun Liu1,2, Heng Sun1,2
1State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.
Micromachines
|December 23, 2022
Summary
High-precision calibration of moving-base gravimeters is crucial for accurate Earth gravity surveys. A new method using overlapping lines significantly improves key parameter accuracy, enhancing the CHZ-II gravimeter
Area of Science:
- Geophysics
- Geodesy
- Instrument Calibration
Background:
- Moving-base gravimeters are essential for Earth gravity surveys.
- Survey accuracy depends on precise calibration of parameters like damping delay time, drift coefficient, and gravity scale factor.
- Existing calibration methods may not achieve the required precision for high-accuracy surveys.
Purpose of the Study:
- To introduce the CHZ-II gravimeter system.
- To propose and validate a new high-precision calibration method for moving-base gravimeters.
- To improve the measurement accuracy of gravimetric surveys.
Main Methods:
- Development of the CHZ-II gravimeter system utilizing a cylindrical sampling mass and a zero-length spring.
- Integration of a Global Navigation Satellite System (GNSS) for carrier motion monitoring and inertia acceleration removal.
- Implementation of a novel calibration method using forward and reverse overlapping lines for parameter calibration and accuracy estimation.
Main Results:
- The proposed calibration method significantly enhances the accuracy of key gravimeter parameters.
- For the CHZ-II gravimeter, measurement accuracy improved by 19.5% to 0.471 mGal after applying calibrated parameters.
- The method demonstrated effectiveness across three different moving-base gravimeters.
Conclusions:
- The new calibration method offers a practical solution for improving the accuracy of moving-base gravimeters.
- This approach is applicable to various platforms, including ships, aircraft, and vehicles.
- Enhanced calibration leads to more reliable and precise Earth gravity survey data.
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