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A ground station used for performing the various functions necessary to control satellite operations and to obtain data from the satellite



Related Terms

CONTROL CURRENT STATION

A current station at which continuous velocity observations have been made over a minimum of 29 days. Its purpose is to provide data for computing accepted values of the harmonic and nonharmonic constants essential to tidal current pre- dictions and circulatory studies. The data series from this station serves as the control for the reduction of relatively short series from subordinate current stations through the method of comparison of simultaneous observations.

COOPERATIVE SYSTEM

A missile guidance system that requires transmission of information from a remote ground station to a missile in flight, processing of the information by the missile-borne equipment, and retransmission of the processed data to the originating or other remote ground stations, as in azusa and dovap.

OUTPUT-LIMITED

Restricted by the need to await completion of an output operation, as in process control or data processing.

OVERHEAD CONSTRAINTS

The elevation angle limitations between which usable navigation data may be obtained from a satellite in the doppler mode.

COAST EARTH STATION

A station which receives communications from an earth orbiting satellite for retransmission via landlines, and vice versa.

CONTROL

  1. The coordinated and correlated dimensional data used in geodesy and cartography to determin

COMPARISON OF SIMULTANEOUS OBSERVATIONS

A reduction process in which a short series of tide or tidal current observations at any place is compared with simultaneous observations at a control station where tidal or tidal current constants have previously been deter- mined from a long series of observations. For tides, it is usually used to adjust constants from a subordinate station to the equivalent of that which would be obtained from a 19-year series.

ORBITAL MODE

A method for determining the position of an unknown station position when the unknown position cannot be viewed simultaneously with known positions. The arc of the satellite orbit is extrapolated from the ephemeris of the satellite determined by the known stations which permits the determination of the position of the unknown station dependent completely on the satellite’s orbital parameters.

CORRECTED CURRENT

A relatively short series of current observations from a subordinate station to which a factor is applied to adjust the current to a more representative value, based on a relatively long series from a nearby control station.

CONNING TOWER

The raised surface operating control station of a submarine. A protective armour plated control station.

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