Navstar 1 was developed by the US Department of Defense to provide all-weather round-the-clock navigation capabilities for military ground, sea, and air forces. The first eleven spacecraft (GPS Block 1) were used to demonstrate the feasibility of the GPS system.
Satellite Information |
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| Name | Navstar 1 |
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| Organization | GPS |
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| Country | United States |
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| Continent | United States |
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| Manufacturer | Rockwell Automation |
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| Type | Satellite |
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| Launch Date | February 22, 1978 |
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| Launch Site | Vandenberg AFB, United States |
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| Launch Vehicle | Atlas F |
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| Mission Duration | 5 years (planned) |
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| Satellite Mass | 450 Kg |
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| Launch Mass | 758 Kg (1671 Lb) |
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| Orbit | Medium Earth Orbit |
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| Apogee Altitude | 20,308 Km |
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| Perigee Altitude | 20,095 Km |
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| Satellite Block | GPS Block I |
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| Nominal Power | 400 W |
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| Period | 718.70 minutes |
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| Pseudo Random Noise Code | 4 |
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| Inclination Angle | 63.3 Deg |
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| COSPAR ID | 1978-020A |
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| SATCAT Number | 10684 |
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| Dimension | 5.3 m (across with solar panels deployed) |
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| Other Names | GPS 1-1, 10684, NDS |
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| Status | Retired |
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