Defense Meteorological Satellite Program (DMSP)
DMSP 5D-1/F2
[Source: National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1977-044A ] DMSP 5D-1/F2 was one of a series of meteorological satellites developed and operated by the Air Force under the Defense Meteorological Satellite Program (DMSP). This program, previously known as DAPP (Data Acquisition and Processing Program), was classified until March 1973. The objectives of this program were to provide global visual and infrared cloud cover data and specialized environmental data to support Department of Defense requirements. Operationally, the program consisted of two satellites in planned 830-km sun-synchronous polar orbits, with the ascending node of one satellite in early morning and the other at local noon. The 5.4-m long spacecraft was separated into four sections: (1) a precision mounting platform (PMP) for sensors and equipment requiring precise alignment, (2) an equipment support module (ESM) containing the electronics, reaction wheels, and some meteorological sensors, (3) a reaction control equipment (RCE) support structure (that has the third-stage motor, hydrazine reaction control system) which supports (4) a 9.29 sq mm solar cell panel. The spacecraft stabilization was controlled by a combination flywheel and magnetic control coil system so sensors could be maintained in the desired `earth-looking' mode. One feature was the precision-pointing accuracy of the primary imager to 0.01 deg provided by a star sensor and an updated ephemeris navigation system. This allowed automatic geographical mapping of the digital imagery to the nearest picture element. The operational line scan system (OLS) built by Westinghouse, was the primary data acquisition system that provided real-time or stored, multi-orbit, day-and-night visual and infrared imagery at 1/3-nautical-mile resolution for all major land masses, 1-1/2-nautical-mile resolution for complete global coverage, and provided with this data calibration, timing, and other auxiliary signals to the spacecraft for digital transmission to the ground. A supplementary sensor package, the special sensor H (SSH), a step-scanning radiometer, was the infrared temperature-humidity-ozone sounder. The data processing system, which included three high-density tape recorders, was capable of storing a total of 400 min of data, each allowing full global coverage twice daily. Either recorded or real-time data were transmitted to ground-receiving sites via two redundant S-band transmitters. Recorded data were read out to tracking sites located at Fairchild AFB, WA, and Loring AFB, ME, and relayed via SATCOM to Air Force Global Weather Central, Offutt AFB, NE. Real-time data were read out at mobile tactical sites located around the world. A more complete description of the satellite can be found in the report, `The Defense Meteorological Satellite Program,' D. A. Nichols, Optical Engineering, 14, 4, July - August 1975. Group: Platform_Details Entry_ID: DMSP 5D-1/F2 Group: Platform_Identification Platform_Category: Earth Observation Satellites Platform_Series_or_Entity: DMSP (Defense Meteorological Satellite Program) Short_Name: DMSP 5D-1/F2 Long_Name: Defense Meteorological Satellite Program-F2 End_Group Group: Synonymous_Platform_Names Short_Name: AMS 2 Short_Name: Advanced Meteorological Satellite 2 Short_Name: DMSP 13536 Short_Name: DMSP-F2 Short_Name: 10033 End_Group Group: Platform_Associated_Instruments Short_Name: SSB/O Short_Name: PASSIVE IONOSPHERIC MONITOR Short_Name: OLS Short_Name: MFR/SSH Short_Name: PES (SSJ/3) Short_Name: SSI/E End_Group Group: Orbit Orbit_Inclination: 99.0° Period: 101.7 minutes Perigee: 811.0 km Apogee: 869.0 km Orbit_Type: LEO > Low Earth Orbit > Polar Sun-Synchronous End_Group Creation_Date: 2007-09-14 Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1977-044A Online_Resource: http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/dmsp.html Online_Resource: http://www.ngdc.noaa.gov/dmsp/ Group: Platform_Logistics Launch_Date: 1977-06-05 Launch_Site: Vandenberg Air Force Base, USA Primary_Sponsor: Department of Defense-Department of the Air Force (United States) End_Group End_Group