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Influence of Sea Level Anomaly on Underwater Gravity Gradient Measurements
Pengfei Xian1, Bing Ji1, Shaofeng Bian1
1Department of Navigation, Naval University of Engineering, Wuhan 430033, China.
Sensors (Basel, Switzerland)
|August 12, 2022
Summary
Sea level anomalies significantly affect underwater gravity gradient measurements, impacting detection and navigation. Underwater systems must account for these gravity disturbances for accurate readings.
Area of Science:
- Geophysics
- Oceanography
- Navigation Science
Background:
- Gravity gradient detection and navigation are crucial for underwater operations.
- Large sea level anomalies in areas like the Kuroshio extension present unique challenges.
- Theoretical research is needed to understand these environmental impacts.
Purpose of the Study:
- To calculate the disturbing gravity gradient caused by sea level anomalies.
- To assess the impact of these anomalies on underwater gravity gradient measurements.
- To inform the development of more accurate underwater detection and navigation systems.
Main Methods:
- Utilized the right rectangular prism method for calculations.
- Analyzed a 5° × 5° area in the Kuroshio extension.
- Calculated disturbing gravity gradients at depths up to 50m below sea level.
Main Results:
- Local sea level anomalies significantly influence underwater gravity gradient measurements.
- Maximum contribution from anomalies exceeded 10 Eötvös (E).
- Temporal changes in sea level anomalies, including seasonal variations, also significantly impact measurements, with changes exceeding 20 E.
Conclusions:
- Sea level anomalies are a critical factor affecting underwater gravity gradient measurements.
- Underwater carriers must incorporate the effects of sea level anomalies for precise detection and navigation.
- Future systems need to account for these dynamic environmental disturbances.
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