Design and implementation of pseudolites time and frequency synchronization system

Abstract

In order to achieve high precision of the time and frequency synchronization of pseudolite automatic network，a pseudolite time and frequency synchronization system using the structure of Self-Calibrating Pseudolite Array(SCPA) is designed. The system takes FPGA+DSP as the core processor, and integrates high-speed A/D, D/A conversion circuit and up and down converter circuit. The design and implementation of pseudolite two-way pseudo distance measurement technology and the time and frequency synchronization scheme are introduced in detail. The test results show that the phase synchronization error of carrier phase is less than 0.1 Hz and the time synchronization accuracy is better than 2 ns, which provids a significant guarantee for the positioning and timing accuracy of the pseudolite automatic system.

Keywords

• pseudolite
• SCPA
• two-way ranging
• time and frequency synchronization