Main and standby satellite clock time frequency signal seamless switching device and method

Abstract

The invention provides a main and standby satellite clock time frequency signal seamless switching device and a main and standby satellite clock time frequency signal seamless switching method. The device comprises an atomic clock group comprising three atomic clocks, wherein each atomic clock is correspondingly and electrically connected to a path of AD (analog-to-digital) sampler, an input signal selection unit is connected with all AD samplers and a main control unit, first and second frequency and phase extraction units, a phase shifting control unit and first and second phase shifting units realize the frequency and phase extraction and phase shifting, main and standby frequency difference and phase difference measurement units measure the main and standby clock frequency difference and phase difference for completing the main and standby clock synchronization, a main clock and a constant temperature crystal oscillation phase difference measurement unit are connected with a main and standby clock signal selection unit and form a feedback loop through a filtering unit, a DA (digital-to-analog) output unit and a constant-temperature crystal oscillation unit, and the main clock and constant temperature crystal oscillation synchronization is realized; the main control unit realizes real-time monitoring on the main and standby clock phase difference, the frequency difference measuring value and the main clock and constant temperature crystal oscillation phase difference measuring value, and in addition, the main clock and the standby clock are switched through control signals when the two measuring values simultaneously exceed the preset threshold values.

Description

technical field [0001] The present invention relates to the field of time-frequency technology of satellite communication, in particular to a device and method for seamlessly switching time-frequency signals of master and slave satellite clocks capable of generating high-precision time and frequency signals of master and slave satellite clocks and realizing seamless switching of master and slave clocks . Background technique [0002] High-precision time and frequency signals play a vital role in the fields of timing, navigation and measurement. In order to achieve high-precision, high-reliability and convenient-to-use time and frequency signals, multiple atomic clock references are generally used for redundant backup, and in the event of a failure of the main clock, the reference will be seamlessly switched to the main clock to output the signal Not affected in any way. In addition, due to certain errors in the accuracy of atomic clocks, in order to obtain higher-precision...

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide a method for seamlessly switching time-frequency signals of the main and standby satellite clocks, which saves the need for double In the mixed time difference measurement link, the error measurement and master-standby synchronization and master clock and OCXO synchronization are digitally processed, and no hardware switch is used to switch the master and backup outputs, thus avoiding the problem of signal discontinuity at the moment of switching

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