| ACRONYM |
DESCRIPTION |
| U.K. |
UNITED KINGDOM |
| U.N. |
UNITED NATIONS |
| U.S. |
UNITED STATES |
| U.S.C. |
UNITED STATES CODE |
| U/D |
UPDATE |
| U/L |
UPLINK |
| U/S |
UPPER STAGE |
| UAF |
UNIVERSITY OF ALASKA, FAIRBANKS |
| UAQPSK |
UNBALANCED, ASYMMETRIC QUADRIPHASE SHIFT KEYED |
| UAQPSK |
UNBALANCED ASYNCHRONOUS QUADRA-PHASE SHIFTKEYED |
| UARS |
UPPER ATMOSPHERE RESEARCH SATELLITE (NASA/ATMOSPHERIC PHYS PROCESS) |
| UCAR |
UNIVERSITY CORPORATION FOR ATMOSPHERIC RESEARCH |
| UCSD |
UNIVERSITY OF CALIFORNIA SAN DIEGO |
| UDA |
UHF DCS/SARP RECEIVE ANTENNA |
| UDA |
ULTRA-HIGH FREQUENCY DATA COLLECTION SYSTEM ANTENNA |
| UDF |
UNIT DEVELOPMENT |
| UDS |
UNIVERSAL DOCUMENTATION SYSTEM |
| UE |
USER EQUIPMENT |
| UER |
UNSATISFACTORY ENGINEERING/EQUIPMENT REPORT |
| UER |
UNIT EVALUATION RECORD |
| UFO |
ULTRA-HIGH FREQUENCY FOLLOW-ON (U.S. NAVY COMM. SATELLITE) |
| UHF |
ULTRA-HIGH FREQUENCY (300 TO 3000 MHz) |
| UIIS |
UNIQUE INSTRUMENT INTERFACE SPECIFICATION |
| UIL |
USER INTERFACE LANGUAGE |
| UK |
UNITED KINGDOM (U.K. PREFERRED AS A MODIFIER) |
| UKMCC |
U.K. MISSION CONTROL CENTRE (PLYMOUTH, ENGLAND) |
| ULA |
FAIRBANKS, AK, STDN STATION |
| ULCC |
UPLINK CARRIER CONTROL |
| ULI |
UPLINK INTERFACE |
| ULP |
UNIFIED FLIGHT SOFTWARE LOAD PACKAGE |
| ULP |
UNIFIED LOAD PACKAGE |
| ULT |
ULTIMATE (LOADS) |
| ULYSSES |
FORMERLY ISPM (NASA/INVESTIGATIONS OF THE HELIOSPHERE, SHUTTLE) |
| um |
MICROMETER (MICRON) |
| UNEP |
UNITED NATIONS ENVIRONMENTAL PROGRAMME |
| UNESCO |
U.N. EDUCATIONAL, SCIENTIFIC, AND CULTURAL ORGANIZATION |
| UNIDATA |
UCAR-BASED DATA EXCHANGE SYSTEM |
| UNIDATA |
UNIVERSAL DATA FORMAT |
| UNIFAX |
A COMMERCIAL WEATHER MAP FACSIMILE SERVICE |
| UPN |
UNIQUE PROJECT NUMBER |
| URA |
USER RANGE ACCURACY |
| urad |
MICRORADIAN(S) |
| URE |
USER RANGE ERROR |
| US |
UNITED STATES (U.S. PREFERRED AS A MODIFIER) |
| us |
MICROSECOND |
| US |
USER SEGMENT |
| USAF |
UNITED STATES AIR FORCE |
| USAF/SD |
UNITED STATES AIR FORCE/SPACE DIVISION |
| USAF-01 |
USAF SATELLITE (SMALL ELV CLASS SPACECRAFT--SPECIFICS TBD) |
| USAPC |
UNITED STATES ARGOS PROCESSING CENTER |
| USARP |
UNITED STATES ANTARCTIC RESEARCH PROGRAM |
| USB |
USER SERVICES BRANCH ( ASHEVILLE, NC/NODC, WASH, DC) |
| USB |
UNIFIED S-BAND RECEIVER |
| USCG |
UNITED STATES COAST GUARD |
| USDA |
UNITED STATES DEPARTMENT OF AGRICULTURE |
| USGS |
UNITED STATES GEOLOGICAL SURVEY (Dol) |
| USMCC |
UNITED STATES MISSION CONTROL CENTER |
| USML |
UNITED STATES MICROGRAVITY LABORATORY (NASA/SHUTTLE uGRAVITY) |
| USMP |
UNITED STATES MICROGRAVITY PAYLOAD (NASA/SHUTTLE MATERIAL PROCESS) |
| USNO |
U.S. NAVAL OBSERVATORY (WASHINGTON, DC) |
| USO |
ULTRA STABLE OSCILLATOR |
| USO |
USER SUPPORT OFFICE |
| USRA |
UNIVERSITY SPACE RESEARCH ASSOCIATES |
| USS |
UNIQUE SUPPORT STRUCTURES |
| USS |
USER SERVICES SUPPORT |
| USSR |
UNION OF SOVIET SOCIALIST REPUBLICS |
| UT |
UNIVERSAL TIME (SAME AS GREENWICH MEAN TIME) |
| UT |
UNIFIED FLIGHT SOFTWARE |
| UT |
UMBILICAL TOWER |
| UT1 |
UNIVERSAL TIME (OBSERVED EARTH TIME) |
| UTC |
UNIVERSAL TIME CODE/CONVENTION/COORDINATED |
| UTDF |
UNIVERSAL TRACKING DATA FORMAT |
| UTH |
UPPER TROPOSPHERIC HUMIDITY |
| UUT |
UNIT UNDER TEST |
| UV |
ULTRAVIOLET |
| UV DIAL |
ULTRAVIOLET DIFFERENTIAL ABSORPTION LIDAR |
| UVLIM |
ULTRAVIOLET LIMB IMAGING EXPERIMENT (NASA/110-300nm RANGE) |
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