Galileo-Based Doppler Shifts and Time Difference Carrier Phase: A Static Case Demonstration.

Area of Science:

• Navigation Systems
• Satellite Technology
• Automotive Engineering

Background:

• European Commission regulations mandate advanced navigation systems in vehicles, including eCall and smart tachographs.
• Global Navigation Satellite System (GNSS) is crucial for vehicle positioning, velocity, and timing (PVT) information.
• Accurate vehicle velocity estimation is vital for new safety features like Intelligent Speed Assistance (ISA).

Purpose of the Study:

• To present and compare two Galileo-based velocity estimation methods: Doppler shift and Time Difference Carrier Phase (TDCP).
• To evaluate the performance of these methods across various Galileo signals (E1, E5a, E5b, E5 Alt BOC, E6).
• To determine the most accurate method for reliable vehicle velocity estimation in compliance with new regulations.

Main Methods:

• Velocity estimation using Doppler shift measurements from Galileo signals.
• Velocity estimation using Time Difference Carrier Phase (TDCP) measurements from Galileo signals.
• Comparative analysis of horizontal and vertical velocity errors using real static data across all Galileo signals.

Main Results:

• The Time Difference Carrier Phase (TDCP) method demonstrated significantly improved performance compared to the Doppler-based method.
• Among Doppler-based solutions, the E5 Alt BOC signal provided the most accurate velocity estimation.
• Both methods were tested using all available Galileo signals to assess their effectiveness.

Conclusions:

• The TDCP technique shows great promise for high-accuracy velocity estimation, outperforming traditional Doppler-based methods.
• Galileo's E5 Alt BOC signal is identified as the most accurate for Doppler-based velocity estimation.
• These findings support the development of more reliable and accurate navigation systems for future automotive applications.