Research area includes GNSS based positioning, navigation and timing, UAV, cube satellite, and smart land vehicle. Practical applications as well as core algorithms of GNSS augmentation system such as WADGPS (Wide-Area Differential GPS) and WARTK (Wide-Area Real Time Kinematic) for cm-level accuracy, are being developed. Also hardware and software GNSS receiver are developed and used in indoor navigation system and in development of the future navigation system. We demonstrated a single GPS antenna based UAV attitude determination and control system 1st in the world, and pseudolite-based indoor navigation system 2nd in the world. Research on drone and land vehicle navigation system for urban area using GPS/INS integration is currently conducted, and also SNUGLITE, a cube satellite, is being built in the lab and will be launched in 2018.