After the first space launch vehicle of Korea, Korea Space Launch Vehicle I (KSLV-I), was successfully launched in January 2013, the Korea Aerospace Research Institute (KARI) is developing Korea Space Launch Vehicle II (KSLV-II), which can deliver up to a 1,500 kg payload to a Sun-synchronous orbit from the Naro Space Center in Korea. KSLV-II is a three-stage, LOx/kerosene powered launch vehicle. The first stage is equipped with four clustered 75 tonf engines, and the second and third stages are powered by a 75 tonf and a 7 tonf engine, respectively. In accordance with the development phase of KSLV-II, the KARI had been also developed a Test Launch Vehicle (TLV), which consisted of a 75 tonf engine and a dummy second stage. In November 2018, the TLV was successfully launched and the liquid engine was sufficiently verified. The main purpose of the TLV was to validate the performance of the liquid engine, but the ability of the avionics in the TLV was also well established through its sub-orbital flight. This paper describes flight experiment results of the GNSS receiver system in the TLV that provided real-time navigation data and raw measurements with an output rate of 10 Hz as well as the time synchronization signals. Detailed performance assessment of the GNSS receiver system during the flight is also discussed based on the telemetry data, which was transmitted to the Naro Space Center via an S-band down-link.

Keywords: GNSS, space launch vehicle, range safety, localization, flight test