科研之友
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摘要
Passive hydrogen maser has excellent middle-to-long-term frequency stability and frequency drift rate, meanwhile, features light weight and small volume. It can be applied as high-precision frequency standard in the fields of satellite navigation, frequency calibration and so on. The important features of the next satellite navigation system are high density and high integration, which places higher requirements on the satellite payloads including space passive hydrogen maser. For this reason, an important development direction of space passive hydrogen maser is to further improve the performance indexes, while reducing the volume and weight. After long-term theoretical exploration and experiment verification, we have achieved good progress in the development of mini space passive hydrogen maser. Through the design of miniaturized cavity-bulb assembly, miniaturized getter pump, ultra-homogeneous C field, high-performance magnetic shielding system and the compact optimization of the electric package, an engineering prototype of the miniaturized space passive hydrogen maser was developed. The frequency stability of the prototype is improved to the level of 8×10-13 t-1/2, while its weight is compressed to within 13.5 kg, which meets the performance requirement of the time-frequency signal of current satellite navigation system and can also serve the next generation Beidou satellite navigation system.
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