Downloaded from the USCG GPSIC, 3/95
AE - Antenna Electronics A/D - Analog to Digital AFB - Air Force Base AFI - Automatic Fault Indication AFS - Air Force Station AHRS - Attitude and Heading Reference System AIMS - Airspace Traffic Control Radar Beacon System IFF Mark XII System A/J - Anti-Jamming AOC - Auxilliary Output Chip A-S - Anti-Spoofing ASIC - Application Specific Integrated Circuit ATE - Automatic Test Equipment BCD - Binary Code Decimal BIH - Bureau International de L'Heure BIPM - International Bureau of Weights and Measures BIT - Built-In-Test BPSK - Bi Phase Shift Keying C/A-code - Coarse/Acquisition-Code CADC - Central Air Data Computer CDMA - Code Division Multiplex Access CDU - Control Display Unit CEP - Circular Error Probable CMOS - Complementary Metal Oxide Semiconductor C/No - Carrier to Noise Ratio CRPA - Controlled Radiation Pattern Antenna CSOC - Consolidated Space Operations Center CW - Continuous Wave DAC - Digital to Analog Converter dB - Decibel (X = 10 Log X dB) 10 DGPS - Differential GPS D-Level - Depot Level DLM - Data Loader Module DLR - Data Loader Receptable DLS - Data Loader System DMA - Defense Mapping Agency DoD - Department of Defense DOP - Dilution of Precision dRMS - Distance Root Mean Square DRS - Dead Reckoning System DT&E - Development Test and Evaluation ECEF - Earth-Centered-Earth-Fixed ECP - Engineering Change Proposal EDM - Electronic Distance Measurement EFIS - Electronic Flight Instrument System EM - Electro Magnetic EMCON - Emission Control ESGN - Electrically Suspended Gyro Navigator FAA - Federal Aviation Administration FMS - Foreign Military Sales FOM - Figure Of Merit FRPA - Fixed Radiation Pattern Antenna FRPA-GP - FRPA Ground Plane GaAs - Gallium Arsenide GDOP - Geometric Dilution of Precision GMT - Greenwich Mean Time GPS - Global Positioning System HDOP - Horizontal Dilution of Precision HOW - Hand Over Word HSI - Horizontal Situation Indicator HV - Host Vehicle HQ USAF - Headquarters US Air Force ICD - Interface Control Document ICS - Initial Control System IF - Intermediate Frequency IFF - Identification Friend or Foe I-Level - Intermediate Level ILS - Instrument Landing System INS - Inertial Navigation System ION - Institute of Navigation IOT&E - Initial Operational Test and Evaluation IP - Instrumentation Port ITS - Intermediate Level Test Set JPO - Joint Program Office J/S - Jamming to Signal Ration JTIDS - Joint Tactical Information Distribution System L - GPS primary frequency, 1575.42 MHz 1 L - GPS secondary frequency, 1227.6 MHz 2 LEP - Linear Error Probable LRIP - Low Rate Initial Production LRU - Line Replaceable Unit LO - Local Oscillator mB - Millibar MCS - Master Control Station MCT - Mean Corrective Maintenance Time 6 MHz - Megahertz (10 Hz) MLV - Medium Launch Vehicle MmaxCT - Maximum Corrective Maintenance Time MOU - Memorandum of Understanding M/S - Metres per Second MSL - Mean Sea Level MTBF - Mean Time Between Failure MTBM - Mean Time Between Maintenance N/A - Not Applicable NAV-msg - Navigation Message NOSC - Naval Ocean Systems Center NRL - Naval Research Labratory -9 NS - Nanosecond (10 second) NSA - National Security Agency NTDS - Navy Tactical Data System NTS - Navigation Technology Satellite OBS - Omni Bearing Select OCS - Operational Control System O-Level - Organization Level OTHT - Over The Horizon Targeting PC - Personal Computer P-Code - Precise Code PDOP - Position Dilution of Precision PLSS - Precision Location Strike System 3 P I - Pre Planned Product Improvement -6 PPM - Parts Per Million (10 ) PPS - Precise Positioning Service PPS-SM - PPS Security Module PRN - Pseudo Random Noise PTTI - Precise Time and Time Interval PVT - Position Velocity and Time RAM - Reliability and Maintainability RCVR - Receiver RF - Radio Frequency RMS - Root Mean Square RNAV - Area Navigation RSS - Root Sum Square RT - Remote Terminal RTCA - Radio Technical Commission for Aeronautics RTCM - Ratio Technical Commission for Maritime Services S/A - Selective Availability SAMSO - Space and Missile Systems Organization SBB - Smart Buffer Box SC - Special Committee SEP - Spherical Error Probable SI - International System of Units SIL - System Integration Labratory SINS - Shipborne INS SPS - Standard Positioning Service SRU - Shop Replacable Unit STDCDU - Standard CDU TACAN - Tactical Air Navigation TAI - International Atomic Time TBD - To Be Determined TDOP - Time Dilution of Precision TFOM - Time Figure Of Merit TTFF - Time to First Fix UE - User Equipment UERE - User Equivalent Range Error UHF - Ultra High Frequency USA - United States of America USNO - US Naval Observatory UT - Universal Time UTC - Universal Time Coordinated VDOP - Vertical Dilution of Precision VHSIC - Very High Speed Integrated Circuit VLSIC - Very Large Scale Integrated Circuit VOR - Very High Frequency (VHF) Omnidirectional Range WGS-84 - World Geodetic System - 1984 YPG - Yuma Proving Ground 1 PPM - 1 Pulse Per Minute 1 PPS - 1 Pulse Per Second