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astronautix.com DMSP Block 5D-2


Other Designations: Defense Meteorological Satellite Program. Class: Earth. Type: Weather. Nation: United States. Agency: USAF, NOAA . Manufacturer: GE Astro Space.

DMSP 5D-2 is the military's sixth generation of weather satellites. The DMSP 5D-2 satellites operate in two satellite constellations to provide world-wide meteorological, oceanographic and solar-terrestrial physics measurements on a twice-daily basis. The visible and infrared sensors collect images of global cloud distribution across a 3,000 km swath during both daytime and night time conditions. The coverage of the microwave imager and sounders are one-half the visible and infrared sensors coverage, covering the polar regions above 60 deg on a twice-daily basis but the equatorial region on a daily basis. The space environmental sensors record along-track plasma densities, velocities, composition and drifts. Spacecraft: Based on GE Tiros bus.3-axis stabilised using reaction wheels, torque rods to 0.01 deg. Hydrazine propulsion system for orbit insertion, nitrogen propulsion system for stationkeeping. Star sensors and gyros provide 0.01 deg. knowledge. Earth sensor, sun sensor carried as backup. Data stored on tape recorder. Solar array generates 900 W (BOL). NiCd batteries with 30 AHr capacity. S-band communications: 5 W RF, 5 MHz bandwidth, omni antennas. Controlled from Offutt AFB, Nebraska with terminals at Loring AFB, Maine, Fairchild AFB, Washington, and AFRTS Hawaii. Payload: Typical payload mass is approximately 110 kg, and includes Operational Linescan System (OLS) - visible/infrared imager, SSM/T - atmospheric sounder producing cloud temperature profiles, SSM/I - microwave imager measuring ice coverage, precipitation areas and intensities, cloud water content, ocean surface wind speeds, SSB/X2 - gamma and x-ray spectrometer, SSJ/4 - measures proton and electron densities, SSM - magnetometer.
Financial/Operational:
R&D cost for DMSP 5D-2 was $ 7.6 million. The first joined 5 earlier generation DMSP's still operating in orbit. Launch of 8 more was planned through 2006.


Specification

Design Life: 3 years . Total Length: 3.4 m. Maximum Diameter: 1.2 m. Total Mass: 770 kg.


DMSP Block 5D-2 Chronology


21 December 1982 AMS 5 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 750 kg. Perigee: 797 km. Apogee: 810 km. Inclination: 98.6 deg.

Defense Meteorological Satellite Program.


18 November 1983 DMSP B5D2-2 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 750 kg. Perigee: 801 km. Apogee: 818 km. Inclination: 98.4 deg.

Defense Meteorological Satellite Program.


20 June 1987 USA 26 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 750 kg. Perigee: 828 km. Apogee: 848 km. Inclination: 98.8 deg.

Defense Meteorological Satellite Program.


03 February 1988 USA 29 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 750 kg. Perigee: 807 km. Apogee: 817 km. Inclination: 98.5 deg.

Defense Meteorological Satellite Program.


01 December 1990 USA 68 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 750 kg. Perigee: 724 km. Apogee: 837 km. Inclination: 98.7 deg.

Defense Meteorological Satellite Program; broken nozzle prevented from reaching desired orbit.


28 November 1991 USA 73 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 830 kg. Perigee: 835 km. Apogee: 852 km. Inclination: 99.0 deg.

Defense Meteorological Satellite Program.


29 August 1994 DMSP 23545 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 830 kg. Perigee: 840 km. Apogee: 860 km. Inclination: 98.9 deg.

Defense Meteorological Satellite Program.


24 March 1995 DMSP 24547 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 750 kg. Perigee: 845 km. Apogee: 854 km. Inclination: 98.8 deg.
04 April 1997 DMSP 5D-2 F-14 Program: DMSP. Launch Site: Vandenberg . Launch Vehicle: Titan 2. Perigee: 842 km. Apogee: 855 km. Inclination: 98.9 deg.

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Last update 12 March 2001.
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