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High Latitude Ionospheric Gradient Observation Results from a Multi-Scale Network.
Nadezda Sokolova1, Aiden Morrison1, Knut Stanley Jacobsen2
1SINTEF Digital, Strindveien 4, 7034 Trondheim, Norway.
Sensors (Basel, Switzerland)
|February 28, 2023
Summary
This study analyzes ionospheric spatial gradients using a multi-scale Continuously Operating Reference Station (CORS) network in the auroral zone. It characterizes signal decorrelation during high ionospheric activity to improve navigation system accuracy.
Area of Science:
- Geophysics
- Space weather
- Satellite navigation
Background:
- Continuously Operating Reference Station (CORS) networks are crucial for precise positioning.
- Ionospheric spatial gradients can introduce errors in Global Navigation Satellite System (GNSS) receivers.
- Sparse CORS networks may miss small-scale ionospheric irregularities.
Purpose of the Study:
- To analyze ionospheric spatial gradient phenomena using a composite multi-scale network.
- To characterize spatial decorrelation between receivers during periods of high ionospheric activity.
- To understand the impact of small-scale ionospheric gradients on GNSS accuracy.
Main Methods:
- Utilized a network of eight CORS receivers and five supplemental test stations.
- Established a composite multi-scale network for detailed analysis.
- Focused on data from the auroral zone at night-time, known for high ionospheric activity.
- Analyzed several hundred validated ionospheric spatial gradient events.
Main Results:
- Quantified spatial decorrelation levels between stations during increased ionospheric activity.
- Identified and analyzed specific ionospheric gradient events with notable characteristics.
- Provided statistical observations on ionospheric spatial gradient phenomena.
Conclusions:
- The study highlights the potential for unobserved ionospheric gradients to affect GNSS accuracy.
- Characterizing these gradients is essential for mitigating residual errors in navigation systems.
- The findings contribute to a better understanding of ionospheric effects in high-latitude regions.
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