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Measurements and Accuracy Evaluation of a Strapdown Marine Gravimeter Based on Inertial Navigation
Wei Wang1,2, Jinyao Gao3, Dongming Li4
1Department of Earth Sciences, Zhejiang University, 38 Zheda Road, Hangzhou 310007, China. 11438025@zju.edu.cn.
Sensors (Basel, Switzerland)
|November 15, 2018
Summary
A new Sea-Air Gravimeter-2Marine (SAG-2M) system offers improved accuracy for marine gravity surveys. This advanced system outperforms traditional gravimeters, enhancing data quality and efficiency at sea.
Area of Science:
- Geophysics
- Oceanography
- Navigation Systems
Background:
- Strapdown gravimetry systems combine Inertial Measuring Units (IMUs) and Global Navigation Satellite Systems (GNSS).
- Limited accuracy of early IMUs and GNSS restricted strapdown gravimetry to airborne, not marine, surveys.
- The cross-coupling effect and ship motion impact marine gravity measurements.
Purpose of the Study:
- To develop and evaluate a novel strapdown inertial navigation system (SINS) for marine gravity surveys.
- To assess the accuracy and efficiency of the Sea-Air Gravimeter-2Marine (SAG-2M) compared to a traditional gravimeter.
- To demonstrate the SAG-2M's capability in challenging marine environments.
Main Methods:
- Development of the Sea-Air Gravimeter-2Marine (SAG-2M) using novel IMU components.
- Integration of Precise Point Positioning (PPP) and an enhanced algorithm to improve accuracy.
- Comparative field testing against a Lacoste and Romberg S-129 gravimeter during a 50-day marine cruise.
- Analysis of crossover point discrepancies and performance in varying sea conditions.
Main Results:
- SAG-2M achieved root mean square (RMS) crossover errors of 0.69 mGal after adjustment, significantly better than the S-129's 0.95 mGal.
- SAG-2M demonstrated superior performance in rough seas, exhibiting fewer high-frequency jumps due to its immunity to the cross-coupling effect.
- The system improved the proportion of valid data and data post-processing efficiency.
- Consistent results between SAG-2M and S-129 were observed in calm sea conditions across all wavelengths.
Conclusions:
- The SAG-2M system offers superior accuracy and efficiency for marine gravity surveys compared to the S-129 gravimeter.
- The novel design and advanced algorithms enable reliable marine gravity measurements even in adverse sea states.
- The SAG-2M shows significant potential for miniaturization, paving the way for future advancements in gravimetry technology.
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