A frequency signal switching system and switching method

Abstract

The invention discloses a frequency signal switching system and switching method, comprising: a main channel frequency source, a backup channel frequency source, a phase detector, a low-pass filter, an AD converter, a DA converter, a local oscillator and an MCU; The channel frequency source and the standby channel frequency source are respectively connected to the phase detector, the low-pass filter and the AD converter in turn; the output end of the AD converter is connected to the input end of the MCU, and the output end of the MCU is connected to the input end of the DA converter. The output terminal of the DA converter is connected with the input terminal of the local oscillator; the output of the local oscillator is divided into two channels, one is used to output the signal, and the other is connected to the input terminal of each phase detector respectively. . The present invention can eliminate the influence of the inherent phase difference existing between various frequency signals, so that the phase does not jump and the signal is not interrupted during the switching process, and the continuity and stability of the frequency signal can be ensured.

Description

technical field [0001] The invention belongs to the technical field of time and frequency, and particularly relates to a frequency signal switching system and switching method. Background technique [0002] In the fields of precision timing, aerospace, radar synchronization, cutting-edge weapon control, high-speed communication, and deep space exploration, higher requirements are placed on frequency signals, requiring them to have the characteristics of accuracy, continuity, stability and reliability. . [0003] In actual use, for the reliability and stability of frequency signals, users often need to have multiple frequency sources. In order to coordinate, a switching method needs to be introduced. When a frequency source in use fails, it can quickly and reliably switch. to another normal frequency source. However, at present, most systems still use hard switching methods such as radio frequency switches to achieve signal switching, which makes the output signal prone to ...

AI Technical Summary

Problems solved by technology

However, at present, most systems still use hard switching methods such as radio frequency switches to achieve signal switching, which makes the output signal prone to problems such as glitches, jumps, and interruptions during the switching process, which affects the stability and continuity of the signal.

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