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Analysis of Satellite Compass Error's Spectrum
Andrzej Felski1, Krzysztof Jaskólski1, Karolina Zwolak1
1Polish Naval Academy, Faculty of Navigation and Naval Weapons, Smidowicza St, 69, 81127 Gdynia, Poland.
Sensors (Basel, Switzerland)
|July 26, 2020
Summary
Satellite compasses offer accuracy comparable to traditional navigation systems. This study analyzes heading errors and frequency spectrums, confirming similar performance to gyrocompasses in real-world shipping scenarios.
Area of Science:
- Marine navigation technology
- Geophysics and seismology
Background:
- Satellite compasses are emerging navigational devices gaining popularity on fishing vessels and pleasure crafts.
- Despite their growing use, they are still viewed with caution on International Convention for the Safety of Life at Sea (SOLAS) vessels.
- Standard satellite compasses demonstrate accuracy around 1 degree, comparable to gyrocompasses and magnetic compasses.
Purpose of the Study:
- To analyze the changeability and frequency spectrum of heading errors in satellite compasses.
- To compare the performance of satellite compasses against onboard standard gyrocompasses and fiber-optic gyrocompasses (FOG) in real shipping conditions.
- To differentiate heading oscillations caused by vessel dynamics from those inherent to the compass systems.
Main Methods:
- Comparative analysis of satellite, gyro, and fiber-optic gyrocompasses using available literature and previous research.
- Analysis of heading oscillations using measurements from stationary compass devices.
- Measurements from compass devices mounted on vehicles moving in straight lines to isolate the impact of steering systems.
- Application of Fourier transform theory to analyze heading changeability in the frequency domain.
Main Results:
- Satellite compasses exhibit similar behavior to gyrocompasses in real shipping circumstances.
- It is challenging to distinguish between ship yaw-induced oscillations and compass oscillations in dynamic environments.
- Frequency domain analysis reveals heading changeability patterns for satellite compasses.
Conclusions:
- Satellite compasses provide accuracy comparable to traditional compass systems.
- Further research is needed to fully understand and mitigate the impact of vessel dynamics on compass accuracy.
- The frequency spectrum analysis provides insights into the dynamic performance of satellite compasses.
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