Frequency Shifts in a Rubidium Frequency Standard due to Coupling to Another Standard
AEROSPACE CORP EL SEGUNDO CA ELECTRONICS TECHNOLOGY CENTER
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Highly reliable timing systems, such as used on board satellites, may incorporate a hot standby atomic clock besides the active one. RF couplings between them may affect the performance of the active clock. We have investigated the effect of such couplings between two rubidium atomic clocks and found that they will add an oscillatory term to the Allan Variance of the active clock, degrading its frequency stability, and that under certain circumstances they may also shift the active clocks operating frequency. We discuss these two effects in detail, and establish the level of isolation required to render them negligible. Atomic clock, Allan variance, RF coupling.
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