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GPS Block 1

Part of the Global Positioning System (GPS) program

GPS Block 1 picture GPS Block 1 satellites formed the GPS Demonstration system and were followed by the Block 2 operational system.

Spacecraft
3-Axis stabilized, 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)

Country of Origin United States
Customer/User U.S. Air Force
Manufacturer(s) Rockwell Space Systems
Size 5.3 m across with solar panels deployed
Orbit 20,200 km circular (12 hour period) 63 deg inclination, 6 orbit planes
Design Life 5 years

Launch Facts
 Name  Int'l Desig.  Date  Site  Vehicle  Orbit  Mass(kg)
    Notes
 GPS 1-1 (Navstar 1)  1978-020A  2/22/78  WSMC  Atlas F  MEO  450
    Also known as Navigational Development Satellite 1; 1st generation Global Positioning System
 GPS 1-2 (Navstar 2)  1978-047A  5/13/78  WSMC  Atlas F  MEO  453
    Also known as Navigational Development Satellite 2; 1st generation Global Positioning System
 GPS 1-3 (Navstar 3)  1978-093A  10/7/78  WSMC  Atlas F  MEO  450
    1st generation Global Positioning System
 GPS 1-4 (Navstar 4)  1978-112A  12/11/78  WSMC  Atlas F  MEO  450
    1st generation Global Positioning System
 GPS 1-5 (Navstar 5)  1980-011A  2/9/80  WSMC  Atlas F  MEO  433
    1st generation Global Positioning System
 GPS 1-6 (Navstar 6)  1980-032A  4/26/80  WSMC  Atlas F  MEO  450
    1st generation Global Positioning System
 GPS 1-7 (Navstar 7)  none  12/18/81  WSMC  Atlas E  FTO  163
    1st generation Global Positioning System
 GPS 1-8 (Navstar 8)  1983-072A  7/14/83  WSMC  Atlas E  MEO  163
    1st generation Global Positioning System
 GPS 1-9 (Navstar 9)  1984-059A  6/13/84  WSMC  Atlas E  MEO  433
    1st generation Global Positioning System
 GPS 1-10 (USA 5)  1984-097A  9/8/84  WSMC  Atlas E  MEO  770
    Also known as Navstar 10; 1st generation Global Positioning System
 GPS 1-11 (USA 10)  1985-093A  10/9/85  WSMC  Atlas E  MEO  163
    Also known as Navstar 11; 1st generation Global Positioning System

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