Atomic clock smooth switching system based on real-time tracking technology

A real-time tracking and switching system technology, applied to instruments using atomic clocks, automatic power control, electrical components, etc. It can solve problems such as reducing the phase jump performance before and after switching, unable to ensure the stability of the output signal, and achieve strong real-time performance. , the effect of high tracking accuracy

Active Publication Date: 2017-12-15
XIAN INSTITUE OF SPACE RADIO TECH
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AI Technical Summary

Problems solved by technology

The former cannot guarantee the stability of the output signal when the working clock fails, and the latter, within the time interval between two trackings, the phase dif...

Method used

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  • Atomic clock smooth switching system based on real-time tracking technology
  • Atomic clock smooth switching system based on real-time tracking technology

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0028] Based on the hardware basis of the DDS and double mixing time difference circuit, the measurement accuracy of the main and standby phase difference is improved through down-conversion. The FPGA module realizes high-precision measurement of the phase difference between the main and standby clocks, and filters and purifies the error signal through an infinite impulse response digital filter to obtain a frequency control signal to fine-tune the frequency control word of the DDS to achieve loop locking. The fast fault detection method of the satellite clock is adopted in the FPGA to judge the fast-changing fault of the working channel signal in time and perform autonomous switching. The accuracy of real-time tracking of the main and standby clocks and the rapidity of fault detection ensure that the frequency and phase jump of the output signa...

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Abstract

The invention discloses an atomic clock smooth switching system based on real-time tracking technology, and relates to the technical field of the time frequency generation and maintenance of a satellite-borne atomic clock. The atomic clock smooth switching system comprises a dual-mixing time difference circuit, a FPGA module, a frequency synthesizer circuit, an electronic switch and an analog phase-locked loop, wherein the FPGA module comprises a DDS module, a phase difference measurement module, an infinite pulse response digital filter module and a fault detection module; on the basis of the DDS module and the dual-mixing time difference circuit, an error signal is filtered and purified through the infinite pulse response digital filter to obtain a frequency control word of the DDS with fine-tuned frequency control; the equality of the tracking period and the measurement is guaranteed through a real-time tracking algorithm without measuring the frequency and the phase in time-sharing, and the frequency and phase jump indexes before and after the switching are ensured.

Description

technical field [0001] The invention relates to the technical field of time-frequency generation and maintenance of satellite-borne atomic clocks, in particular to a stable atomic clock switching system based on real-time tracking technology. Background technique [0002] The Beidou-2 satellite uses the 10MHz frequency of the atomic clock as the satellite standard time reference signal. The reference frequency synthesizer of the time-frequency generation and maintenance equipment receives the 10MHz signals output by the two atomic clocks, and generates two 10.23MHz reference signals using the main and standby frequency synthesis links. frequency. Select one of them through the electronic switch to enter the phase-locked loop to lock the high-stable crystal oscillator, providing a stable and reliable 10.23MHz reference frequency for navigation satellites. [0003] When the atomic clock or frequency synthesizer of the on-board working path fails, the 10.23MHz signal will be d...

Claims

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Application Information

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IPC IPC(8): H03L7/26G04F5/14
CPCG04F5/14H03L7/26
Inventor 何冬韩虹孙云峰赵明杜二旺秦晓伟王国永李迪蒋军纪
Owner XIAN INSTITUE OF SPACE RADIO TECH
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