A New Real-Time Cycle Slip Detection and Repair Method under High Ionospheric Activity for a Triple-Frequency GPS/BDS...

Area of Science:

• Geodesy
• Satellite Navigation
• Signal Processing

Background:

• High-precision Global Navigation Satellite System (GNSS) positioning relies on accurate cycle slip detection and repair.
• Modern GNSS systems offer triple-frequency signals, enabling new methods for cycle slip detection.
• High ionospheric activity can challenge the reliability of GNSS positioning.

Purpose of the Study:

• To develop a real-time cycle slip detection and repair method for undifferenced Global Positioning System (GPS)/BeiDou Navigation Satellite System (BDS) triple-frequency observations.
• To address challenges posed by high ionospheric activity.
• To enhance the accuracy and reliability of GNSS-based positioning.

Main Methods:

• Utilizing three optimal linearly independent geometry-free pseudorange minus phase combinations for cycle slip determination.
• Employing a second-order time-difference algorithm to mitigate ionospheric residual impacts.
• Validating the method with static and kinematic GPS/BDS triple-frequency data under active ionospheric conditions.

Main Results:

• The method successfully detects and repairs cycle slips with a resolution as small as 1 cycle.
• Performance validated using static data with simulated cycle slips under high ionospheric activity.
• Effectiveness demonstrated on kinematic data from car-driven and airborne experiments.

Conclusions:

• The proposed method provides accurate and reliable real-time cycle slip detection and repair for GPS/BDS triple-frequency systems.
• It is particularly effective under high ionospheric activity.
• The approach is suitable for both static and kinematic precise positioning applications.