Real-Time Coseismic Displacement Retrieval Based on Temporal Point Positioning with IGS RTS Correction Products

Area of Science:

• Geodesy and Geophysics
• Satellite Navigation Systems
• Seismology

Background:

• High-rate Global Navigation Satellite System (GNSS) is crucial for precise coseismic displacement retrieval.
• Existing methods like Relative Positioning (RP) and Precise Point Positioning (PPP) have limitations, including reference station instability and long convergence times.
• The Temporal Point Positioning (TPP) method offers drift-free displacement retrieval but requires precise orbit and clock products, often unavailable in real-time.

Purpose of the Study:

• To evaluate the performance of the Temporal Point Positioning (TPP) method for real-time coseismic displacement retrieval using International GNSS Service (IGS) Real-Time Service (RTS) correction products.
• To assess the accuracy and reliability of TPP with real-time products compared to traditional methods.

Main Methods:

• Real-time precise orbit and clock offsets were derived from IGS RTS correction products.
• Temporal-differenced ionosphere-free (IF) combinations were formed and used as TPP measurements.
• Coseismic displacements were retrieved in real-time by applying these products to TPP measurements.

Main Results:

• A stationary experiment demonstrated an accuracy of 1.8 cm (horizontal) and 4.1 cm (vertical) over 15 minutes.
• Application to an earthquake event yielded accuracies of 1.2 cm (horizontal) and 2.4 cm (vertical).
• The TPP method with IGS RTS products proved effective for real-time coseismic displacement retrieval with minimal drift.

Conclusions:

• The TPP method, utilizing IGS RTS products, provides a viable and accurate solution for real-time coseismic displacement retrieval.
• This approach overcomes limitations of traditional methods, offering rapid and precise earthquake impact assessments.
• Further research can explore integration into operational earthquake monitoring systems.