Safran Group has introduced its latest innovation, the Space-Qualified Rubidium Frequency Standard (RAFS). This advanced atomic clock offers an output frequency range of up to 10 MHz and a remarkable frequency stability of 2 x 10^-14, making it suitable for use in Low Earth Orbit (LEO), Medium Earth Orbit (MEO), and Geostationary Orbit (GEO).
The RAFS operates using a voltage-controlled crystal oscillator (VCXO) locked to a highly stable atomic transition in the Rb87 isotope's ground state. While the VCXO frequency is set at 10 MHz, the Rb clock itself operates at 6.834 GHz in the microwave range. Frequency matching between the VCXO and the Rb clock is achieved through a phase-stabilized frequency multiplication scheme.
This state-of-the-art rubidium atomic clock is engineered for high stability with a frequency accuracy of less than 2 x 10^-10 and a phase noise of up to -145 dBc. It features a long-life Rb lamp with an extended life expectancy of over 20 years. The RAFS requires a supply voltage of 28-50 V, dissipates less than 35 W of power during normal operation, and weighs a maximum of 3.4 kg. It measures 217 x 124 x 117 mm.
Designed for next-generation space applications, the RAFS is well-suited for navigation satellites, space scientific missions, military communication satellites, and tracking and guidance control systems.
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