Design Considerations and Performance of a Spaceborne Hydrogen Maser Frequency Standard
HUGHES AIRCRAFT CO LOS ANGELES CA SPACE AND COMMUNICATIONS GROUP
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An engineering development model EDM of a compact hydrogen maser atomic clock for spaceborne applications has been built by Hughes Aircraft Company, Space and Communications Group SCG. The clock weighs 29.1 kg and has a power consumption of 64 Watts. The clock has demonstrated an excellent immunity to baseplate temperature variations during thermalvacuum tests, maintaining a fractional frequency stability of 2x10-15 for a 105 sec averaging time in the presence of a 10 deg C sinusoidal baseplate temperature modulation. The drift rate is also quite low, a few parts in 10-15day as measured against a VLGl1 conventional maser, The design criteria, several technical solutions and the possibility of further reductions in size and weight are discussed.
- Lasers and Masers