Possible GPS control station?

Saint Helena / Ascension / Georgetown /
 military, antenna
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This installation, one of six worldwide, is linked with the NIST labs master atomic clocks in Boulder Colorado. They monitor the GPS satellite signals and sends, if needed, correction signals to the satellites.

Or, its function may be one of those hypothesized for the antenna array a mile to the west (see that tag for more information).
Nearby cities:
Coordinates:   7°58'27"S   14°23'29"W
This article was last modified 11 years ago