GPS Week Number Rollover Timestamp Complement.

Area of Science:

• Satellite Navigation Systems
• Geomatics Engineering

Background:

• Global Positioning System (GPS) is a critical satellite navigation system for tracking and navigation.
• A recent GPS week number rollover event, caused by a design limitation, disrupted numerous systems reliant on GPS data.
• Fleet management systems experienced significant operational losses due to inaccurate GPS receiver data.

Purpose of the Study:

• To provide a technical and mathematical analysis of the GPS week number rollover phenomenon.
• To propose and evaluate solutions for mitigating the impact of GPS week number rollover on dependent subsystems.
• To offer proactive measures for addressing future GPS week number rollover events.

Main Methods:

• Analysis of the GPS week number rollover phenomenon.
• Development of a transport layer solution using TCP packet reformation with a timestamp complement.
• Implementation and testing of database-level and hardware-level solutions.
• Validation of solutions using real-world data from a fleet management company.

Main Results:

• The transport layer solution demonstrated superior effectiveness in speed, efficiency, accuracy, cost, and complexity.
• Database and hardware-level solutions were also investigated and tested.
• The proposed mathematical model for timestamp complementation proved viable for correcting week number rollover issues.

Conclusions:

• The transport layer level solution is the most effective method for resolving GPS week number rollover consequences.
• Implementing a mathematical model at the transport layer ensures stability for subsystems using GPS data.
• Proactive measures and robust solutions are essential for maintaining the integrity of GPS-dependent systems.