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Space qualified 5 MHz ultra stable oscillators

by V. Candelier, P. Canzian, J. Lamboley, M. Brunet, G. Santarelli
IEEE International Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 ()


New demanding targets have been specified for on board ultra-stable oscillators (USO) in the frame of new programs. The aim was to reach the highest feasible frequency stability performance over life-time, with the USO operating within all space environmental conditions. Immediate applications are dedicated to accurate orbitography (new DORIS equipment) and frequency metrology (PHARAO/ACES project); further ones will cover fine positioning equipment (navigation or localization ) and time-keeping systems. This paper summarizes: 1. Xtal qualification plan and test results; 2. USO qualification test plan; 3. qualification & flight models data. Main performance measured and validated on these USO models: a) aging slope better than 1.10<sup>-11</sup>/day at early stage operation, b) mid'term/TDEV lower than 3 ns over 24 hours, c) short-term stability/Allan standard deviation from 5 to 7.10<sup>-14</sup>/1 s to 10 s, (measured with a Sapphire reference), d) thermal stability better than 3.10<sup>-13</sup>/&deg;C, e) irradiation sensitivity below 5.10<sup>-13</sup>/rad for on-board devices, f) magnetic field sensitivity below 5.10<sup>-13</sup>/gauss. USO mechanical robustness has been validated under vibration up to 30 grms (from 20 Hz to 2000 Hz), and shocks (200 g/0.5 ms). Space USO @ 5 MHz is now available with the same performance as the best CFPO-US1 ground base models with addition of all environmental conditions linked to Space applications.

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