The GNSS receiver for Korea Space Launch Vehicle (KSLV)-II can provide the real-time navigation and timing information to each stage telemetry system. The KSLV-II GNSS receiver processes all signals from 4 different antennas simultaneously and utilizes L1 and L5 of GPS, GLONASS, Galileo signals and creates 1 Pulse Per Second (1PPS) and Inter-Range Instrumentation Group Time Codes B (IRIG-B) timing signals to synchronize sub-systems. This timing signal accuracy are measured and compared with commercial timing receiver using frequency standard, frequency counter. Since the accuracy of timing signal may be degraded during holdover period when the GNSS signal is unavailable, the holdover performance test is also conducted. The test is done with the development model of KSLV-II GNSS receiver, and the performance of the receiver met the specification. This paper describes the test equipments and analyzes the test results of timing signal from KSLV-II GNSS receiver.

Keywords: GNSS, launch vehicle, 1PPS, timing accuracy