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Chapter 14 62 Acronyms GRC GRCN GSS GSTB GTR GTS GUI GUS GUST GUSTR Galileo Reception Chain Galileo Reception Chain Non-PRS Galileo Sensor Stations Galileo System Test Bed Galileo Test Receiver Galileo Test Signal Generator Graphical User Interface Ground Uplink Station WAAS GUS-Type 1 WAAS GUST Type-1 Receiver HDOP hex HFOM HMAC HP HTDOP Hz Horizontal Dilution Of Precision Hexadecimal Horizontal Figure of Merit Hashed Message Authentication Code High Performance (standard OmniSTAR service) Horizontal Position and Time Dilution Of Precision Hertz I and Q I Channel IBIT IC ICAO ICD ICP ID IEC IEEE IERS IF IGP IGRF IGS CB IM IMLA IMO IMU INH INS I/O IODE IOV IP IRQ ISG ISO ITRF In-Phase and Quadrature (Channels) In-phase Data Channel Initiated Built In Test Integrated Circuit International Civil Aviation Organization Interface Control Document Integrated Carrier Phase Identification International Electrotechnical Commission Institute of Electrical & Electronics Engineers International Earth Rotation Service Intermediate Frequency Ionospheric Grid Point International Geometric Reference Field International GPS Service Central Bureau (IGS CB) Intermodulation Integrated Multipath Limiting Antenna International Maritime Organization Inertial Measuring Unit Inhibit Inertial Navigation System Input/Output Issue of Data (Ephemeris) In-Orbit Validation Internet Protocol Interrupt Request IF Signal Generator International Organization for Standardization (not an acronym but a short form) International Terrestrial Reference System JPL JTAG Jet Propulsion Laboratory (NASA) Joint Test Action Group KPA Kb Klystron Power Amplifier Kilobit GPS+ Reference Manual Rev 0I