• DEVELOPMENT OF A PORTABLE TM GROUND STATION FOR KSLV-II WITH A RS422-TO-ETHERNET TM PCM DECODER AND MAGALI TM SOFTWARE

      Yoon, Wonju; Noh, Seongmin; Korea Aerospace Research Institute (International Foundation for Telemetering, 2017-10)
      The onboard telemetry (TM) system of Korea Space Launch Vehicle-II (KSLV-II) transmits PCM framedatatotheTMgroundstationviaRS422beforeflightorviaRFlinkduringflight. Thispaper describes the development of a portable TM ground station for KSLV-II that can decommutate the PCM frame data received via RS422. The developed portable TM ground station consists of two major components: a RS422-to-Ethernet TM PCM decoder and a laptop running MAGALI commercial TM software. The TM PCM decoder transforms a serial bit stream of the PCM data received via RS422 into multicast UDP packets. The MAGALI TM software supports an Ethernet acquisition module for the reception of the PCM frame data, which enables decommutation of the UDP packet-based PCM frame data received from the TM PCM decoder. Furthermore, the use of multicast UDP enables simultaneous decommutation of the PCM frame data at multiple laptops running MAGALI.