Satellite controlled clock

Details Satellite controlled clock Satellite controlled clock

G - Physics

04

C

58/6

G04C 11/02 (2006.01) G04G 7/02 (2006.01)

Patent

CA 1127854

ABSTRACT OF THE DISCLOSURE Disclosed is a satellite controlled clock operative to receive time code, a standard pulse set and satellite posi- tion modulated radio frequency carries waves from either of two geostationary satellites operating at different carrier wave frequencies. The clock has a radio receiving stage and a switch for selecting the carrier frequency of either of the satellites. A frequency scanner incrementally sweeps the receiving stage through a frequency band including the selected satellite carrier frequency responsive to the application of power to the receiver and selection of a satellite by the switch. A phase locked loop tracks the selected satellite carrier wave and the frequency scanner is disabled upon detec- tion of the satellite carrier. Disablement of the frequency scanner causes a local clock to be synchronized with pulses from the satellite. A decoder decodes a time code transmitted by the satellite. A coding switch enables introduction of the receiver's position into the receiver in code form. A calculator calculates the path time delay of satellite signals from the known satellite position and the receiver's position. Decoded time signals from the satellite are combined with the path time delay calculations and the corrected time displayed.

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