Development of safe and available navigation systems by utilizing dual-frequency and multi-constellation GNSS

The global navigation satellite system (GNSS) including GPS (US), GLONASS (Russia), Galileo (Europe), and BDS (China) is now available for air navigation. Augmentation systems for these dual-frequency and multi-constellation (DFMC) GNSS are being standardized and developed. In this study, we develop navigation systems with the new DFMC GNSS to provide safe and always available navigation in various phases of operations.