The GNSS receivers, which utilize RF signals from external navigation satellites to obtain position and time information are widely used for range safety as well as navigation in space launch vehicles. Unlike only position and velocity information are used in KSLV-I flight test, time information of the GNSS receiver will be also utilized in KSLV-II to synchronize sub-systems. The time information is also needed for analyse the cause and effect in case the flight test is not performed well. There have been lots of tests to assess or qualify the GNSS receiver position and velocity perspective, but the accuracy of time information has not been calculated yet. Even though the GNSS receiver for KSLV-II is still developing, the prototype of KSLV-II GNSS receiver can provide not only time information such as 1-PPS, IRIG-B, but also position and velocity. This paper describes the test configuration, test procedure and test results for time information measurements of prototype KSLV-II GNSS receiver.

Keywords: KSLV-II, GNSS, 1-PPS, stability, time synchronization