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Global Positioning System (GPS)
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The Global Positioning System (GPS) is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services. This system consists of three segments: the space segment, the control segment, and the user segment. The U.S. Air Force develops, maintains, and operates the space and control segments.
GPS satellites provide service to civilian and military users. The civilian service is freely available to all users on a continuous, worldwide basis. The military service is available to U.S. and allied armed forces as well as approved Government agencies.
The specified minimum signal strength on the ground for GPS is:
| L1 P(Y): | -161.5 dBW |
| L1 C/A: | -158.5 dBW |
| L2 P(Y): | -161.5 dBW |
| L2 C: | -158.5 dBW |
| L5 (I5 & Q5): | -157.0 dBW |
The first of 32 next-generation GPS satellites (GPS III) is scheduled to be launced in 2014. The new system isn't expected to have widespread availability before approximately 2020.
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Frequencies |
| Frequency | Bandwidth | Use | Service | Table |
| 1176.45 MHz | 24 MHz | GPS Link 5 (L5) | Radionavigation-satellite | F |
| 1227.6 MHz | 30.69 MHz | GPS Link 2 (L2) | Radionavigation-satellite | F |
| 1379.913 MHz | - | GPS Link 4 (L4) | Radionavigation-satellite | F |
| 1381.05 MHz | - | GPS Link 3 (L3) | Radionavigation-satellite | F |
| 1575.42 MHz | 30.69 MHz | GPS Link 1 (L1) | Radionavigation-satellite | F |
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