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astronautix.com DSCS III

DSCS-3
DSCS-3 -

Credit: USAF. 6,090 bytes. 250 x 150 pixels.



Other Designations: Defense Satellite Communications System. Class: Communications. Type: Military. Nation: United States. Agency: USAF. Manufacturer: GE Astro Space.

DSCS provides secure voice and data communications for the US military. The contract is managed by the DCA (Defense Communications Agency) for the USAF. Recurring cost is quoted as $160 million in Aviation Week (8/7/95). Spacecraft: 3-axis stabilisation (0.1 deg control in pitch, roll) using reaction wheels, earth and sun sensors. Two articulated solar arrays produce 1240 W (BOL), NiCd batteries with 105 AHr, 28V bus. S-Band (SGLS) and X-Band command and telemetry links. Blowdown hydrazine propulsion system with 16 x 1-lbf thrusters. Payload: Six SHF channels. Ch1: 50 MHz, 40 W; Ch2: 75 MHz, 40 W; Ch3: 85 MHz, 10 W; Ch4: 85 MHz, 10 W; Ch5: 60 MHz, 10 W; Ch6: 50 MHz, 10 W. Full Earth and narrow coverage capabilities. Receive antennas: two Earth coverage horns, one steerable 61-beam nulling lens. Transmit antennas: two Earth coverage horns, two steerable 19-beam wave guide lens, one high gain parabolic gimballed dish.
Financial/Operational:
General Electric received contract in February 77 for DSCS III. First General Electric DSCS III F1 launch was in 1982.


Specification

Design Life: 10 years. Total Length: 2.1 m. Maximum Diameter: 2.0 m. Total Mass: 2,613 kg.


DSCS III Chronology


30 October 1982 DSCS III-01 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Titan 34D. Perigee: 35,778 km. Apogee: 35,797 km. Inclination: 3.4 deg.

Spent boosters, spent maneuvering stages, shrouds and other non-functional objects (US Cat D).


03 October 1985 USA-12 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Shuttle. Perigee: 35,633 km. Apogee: 35,963 km. Inclination: 0.3 deg.

Released from STS 51J 10/4/85; boosted into orbit with DSCS 3 F3 on single IUS booster. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).


04 September 1989 USA 43 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Titan 34D. Perigee: 35,777 km. Apogee: 35,799 km. Inclination: 6.1 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).



DSCSDSCS

Credit: USAF. 8,307 bytes. 180 x 270 pixels.


11 February 1992 USA 78 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas II. Perigee: 30,675 km. Apogee: 35,503 km. Inclination: 0.9 deg.

Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B). Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option.


02 July 1992 USA 82 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas II. Perigee: 35,775 km. Apogee: 35,800 km. Inclination: 0.2 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option.


19 July 1993 USA 93 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas II. Mass: 2,615 kg. Perigee: 183 km. Apogee: 35,764 km. Inclination: 26.1 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option.


28 November 1993 USA 97 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas II. Mass: 2,615 kg. Perigee: 195 km. Apogee: 35,501 km. Inclination: 26.4 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option.


31 July 1995 USA 113 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas IIA. Mass: 2,610 kg. Perigee: 35,787 km. Apogee: 35,787 km. Inclination: 0.0 deg.
25 October 1997 DSCS III B-13 Program: DSCS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas IIA. Perigee: 35,770 km. Apogee: 35,800 km. Inclination: 0.0 deg.

Geosynchronous. Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option.


21 January 2000 USA 148 Launch Site: Cape Canaveral . Launch Vehicle: Atlas IIA. Perigee: 35,780 km. Apogee: 35,790 km. Inclination: 0.0 deg.

Part of the US Air Force Defense Satellite Communications System. To be stationed in geosynchronous orbit over the Pacific Ocean.



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Last update 12 March 2001.
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