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| One Method of the Extraction of the Error Signal Based on the Onboard Hydrogen Maser |
| ZHAO Guang-dong1,CHEN Peng-fei2,LIU Jie1,HUANG Yi1,LI Si-heng1 |
1. Shanghai Aerospace Electronic Technology Institute, Shanghai 201109, China
2. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China |
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Abstract In view of the high precision positioning requirements of the new generation of satellite navigation system of china, the onboard hydrogen maser has been widely used in the system as a frequency reference because of its excellent long-term stability, drift rate and temperature characteristics. The passive onboard hydrogen maser with dual-frequency scheme consists of physical part and circuit part. The microwave excitation signal excites the microwave cavity of the physical part and generates the error signal of cavity frequency and the error signal of high stability crystal oscillator. For how to extract and process these two kinds of error signal, one separation scheme of amplitude modulation signal by the same time sequence synchronization of error signal and detection signal is proppsed. At the same time, the crystal oscillator error signals are sampled and maintained to realize the downloading of the telemetry parameters of hydrogen maser's locking.
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Received: 12 November 2019
Published: 18 February 2021
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2021, Vol. 42 
