Research on Remote GPS Common-View Precise Time Transfer Based on Different Ionosphere Disturbances

Area of Science:

• Geophysics
• Satellite Geodesy
• Metrology

Background:

• Precise time transfer via common view satellites is crucial for global navigation and scientific applications.
• Propagation path delays, primarily from ionospheric and tropospheric effects, introduce significant errors.
• These atmospheric effects become less correlated with increasing receiver separation, complicating time transfer.

Purpose of the Study:

• To investigate and compare different ionospheric correction methods for common view time transfer.
• To determine the optimal ionospheric correction strategy based on receiver distance.
• To enhance the accuracy of remote precise time transfer.

Main Methods:

• Utilized multi-source data under various ionospheric disturbance conditions.
• Analyzed three distinct ionospheric disturbance simulation methods.
• Evaluated the performance of different correction techniques for common view time transfer and comparison.

Main Results:

• Identified the advantages and disadvantages of various ionospheric correction approaches.
• Demonstrated that specific methods are more suitable for different receiver distances.
• Achieved a Root Mean Square (RMS) error of 2.5 ns for common view time transfer at 3000 km.

Conclusions:

• A distance-dependent ionospheric correction method is proposed for common view time transfer.
• The proposed method significantly improves time transfer accuracy over long baselines.
• This research provides a practical solution for mitigating ionospheric errors in precise time synchronization.