B

Acronyms and Glossary

AFSPC Air Force Space Command
AIAA American Institute of Aeronautics and Astronautics
AOF Area Overflight—computes when overhead satellites can see a particular location on Earth; uses both SGP4 and SP for generation of ephemerides
ASW astrodynamics support workstation
BATCHDC Batch Differential Correction—performs a least-squares batch differential correction of orbital elements using tracking data and both the SGP4 and the SP propagator
C2 Command and Control
CA conjunction assessment
CAVENet Command, Analysis, Verification and Ephemeris Network
CDD Capability Development Document
CMAFS Cheyenne Mountain Air Force Station
COMBO Computation of Miss Between Orbits—computes close approaches between satellites using both SGP4 and SP for generation of ephemerides
CRD Capstone Requirements Document
CSM conjunction summary message
CTIPe Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics model
DMSP Defense Meteorological Satellite Program
DTM-2000 Drag Temperature Model, released in 2000; empirical model of thermospheric temperature, composition, and density
EKF extended Kalman filter
ephemeris a tabulation of computed positions and velocities (and/or various derived quantities such as right ascension and declination) of an orbiting body at specific times
ESA European Space Agency


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B Acronyms and Glossary AFSPC Air Force Space Command AIAA American Institute of Aeronautics and Astronautics AOF Area Overflight—computes when overhead satellites can see a particular location on Earth; uses both SGP4 and SP for generation of ephemerides ASW astrodynamics support workstation BATCHDC Batch Differential Correction—performs a least-squares batch differential correction of orbital elements using tracking data and both the SGP4 and the SP propagator C2 Command and Control CA conjunction assessment CAVENet Command, Analysis, Verification and Ephemeris Network CDD Capability Development Document CMAFS Cheyenne Mountain Air Force Station COMBO Computation of Miss Between Orbits—computes close approaches between satellites using both SGP4 and SP for generation of ephemerides CRD Capstone Requirements Document CSM conjunction summary message CTIPe Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics model DMSP Defense Meteorological Satellite Program DTM-2000 Drag Temperature Model, released in 2000; empirical model of thermospheric temperature, composition, and density EKF extended Kalman filter ephemeris a tabulation of computed positions and velocities (and/or various derived quantities such as right ascension and declination) of an orbiting body at specific times ESA European Space Agency 69

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70 CONTINUING KEPLER’S QUEST—ASSESSING AIR FORCE SPACE COMMAND’S ASTRODYNAMICS STANDARDS FOV field of view—determines times in which orbiting satellites fly through a ground- based observer’s conical field of view; can be defined by a constant azimuth and elevation, a constant right ascension and declination, or as a line of sight to another satellite; uses both SGP4 and SP for generation of ephemerides FRD Functional Requirements Document GEO geostationary orbit GITM Global Ionosphere-Thermosphere Model GP general perturbations GSFC Goddard Space Flight Center HASDM High Accuracy Satellite Drag Model HEO highly elliptical orbit ICD Initial Capabilities Document IEEE Institute of Electrical and Electronics Engineers IOMOD astrodynamics algorithm that computes an initial set of orbital elements from three observations IR infrared ITAR International Traffic in Arms Regulations J70 Jacchia 1970 empirical model of thermospheric density JB2008 Jacchia-Bowman 2008 empirical model of thermospheric density JCD Joint Capabilities Document JMS JSpOC Mission System JSpOC Joint Space Operations Center LAMOD astrodynamics algorithm that computes sensors’ (ground- or space-based) viewing opportunities (so-called look angles) for Earth-centered satellites; uses both SGP4 and SP for generation of ephemerides MDA Missile Defense Agency MHT multiple hypothesis tracking MIT Massachusetts Institute of Technology MSIS Mass Spectrometer Incoherent Scatter radar—series of models describing atmospheric temperature, composition, and density NASA National Aeronautics and Space Administration NOAA National Oceanic and Atmospheric Administration NORAD North American Aerospace Defense Command NRLMSISE-00 Naval Research Laboratory Mass Spectrometer Incoherent Scatter radar Extended—empirical model of atmospheric temperature, composition, and density, released in 2000 NRO National Reconnaissance Office OCM orbital conjunction message ROTAS Report/Observation Association—associates observations against satellite element sets RSO resident space object

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71 APPENDIX B SEQDC Sequential Differential Correction—performs a series of least-squares differential corrections that are computed in a sequential mode, which uses one or more observations or tracks while retrieving former covariance information from a prior differential correction; uses both SGP4 and SP for generation of ephemerides SGP4 Simplified General Perturbations 4—an analytic method of generating ephemerides for satellites in Earth-centered orbits SMC Space and Missile Systems Center SOA service-oriented architecture SP Special Perturbations—an algorithm that uses numerical integration to generate ephemerides for satellites in Earth-centered orbits SPADOC Space Defense Operations Center SPK a type of file that contains ephemeris (trajectory) data SRP solar radiation pressure SSA space situational awareness SSN Space Surveillance Network TIE-GCM Thermosphere Ionosphere Electrodynamics General Circulation Model TIME-GCM Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model TLE two-line element UCT uncorrrelated track UKF unscented Kalman filter USAF United States Air Force WACCM-X Whole Atmosphere Community Climate Model, extended to the exobase WAM Whole Atmosphere Model WGS-72 World Geodetic Survey 1972 Earth gravity model WGS-84 World Geodetic Survey 1984 Earth gravity model

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