This page no longer updated from 31 October 2001. Latest version can be found at www.astronautix.com

astronautix.com GPS Block 1

GPS Block 1
GPS Block 1 -

Credit: USAF. 15,257 bytes. 229 x 270 pixels.



Other Designations: Global Positioning System. Class: Navigation. Nation: United States. Agency: U.S. Air Force. Manufacturer: Rockwell Space Systems.

GPS Block 1 satellites formed the GPS Demonstration system and were followed by the Block 2 operational system. Spacecraft: 3-Axis stabilised, nadir pointing using reaction wheels. Dual solar arrays supply over 400 watts (EOL). NiCd batteries. S-Band (SGLS) communications for control and telemetry. UHF cross-link between spacecraft. Hydrazine propulsion system. Payload: Two L-Band navigation signals at 1575.42 MHz (L1) and 1227.60 MHz (L2)
Financial/Operational:
Block I satellite cost was $ 20 million each.


Specification

Design Life: 5 years. Total Mass: 770 kg.


GPS Block 1 Chronology


22 February 1978 Navstar 1 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas F. Mass: 450 kg. Perigee: 20,224 km. Apogee: 20,584 km. Inclination: 64.5 deg.

Also known as Navigational Development Satellite 1. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).


13 May 1978 Navstar 2 Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas F. Mass: 453 kg. Perigee: 19,523 km. Apogee: 20,653 km. Inclination: 63.6 deg.

Also known as Navigational Development Satellite 2. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).


07 October 1978 Navstar 3 Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas F. Mass: 450 kg. Perigee: 20,706 km. Apogee: 20,941 km. Inclination: 63.3 deg.

Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).


11 December 1978 Navstar 4 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas F. Mass: 450 kg. Perigee: 20,750 km. Apogee: 21,012 km. Inclination: 64.6 deg.

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


09 February 1980 Navstar 5 Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas F. Mass: 433 kg. Perigee: 19,805 km. Apogee: 20,560 km. Inclination: 64.9 deg.

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


26 April 1980 Navstar 6 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas F. Mass: 450 kg. Perigee: 19,387 km. Apogee: 20,471 km. Inclination: 62.8 deg.

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


19 December 1981 Navstar 7 Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas E. FAILURE: Failure. Mass: 163 kg.

Global Positioning System.


14 July 1983 Navstar 8 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 163 kg. Perigee: 19,821 km. Apogee: 20,542 km. Inclination: 64.0 deg.

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


13 June 1984 Navstar 9 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 433 kg. Perigee: 20,031 km. Apogee: 20,333 km. Inclination: 63.9 deg.

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


08 September 1984 Navstar 10 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 770 kg. Perigee: 19,952 km. Apogee: 20,411 km. Inclination: 63.5 deg.

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


09 October 1985 Navstar 11 (GPS) Program: Navstar. Launch Site: Vandenberg . Launch Vehicle: Atlas E. Mass: 163 kg. Perigee: 19,834 km. Apogee: 20,529 km. Inclination: 64.6 deg.

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



Bibliography:



Back to Index
Last update 12 March 2001.
Contact Mark Wade with any corrections or comments.
Conditions for use of drawings, pictures, or other materials from this site..
© Mark Wade, 2001 .