Constant temperature crystal oscillator high-precision frequency control device and control method thereof

Abstract

The invention discloses a constant temperature crystal oscillator high-precision frequency control device and a control method thereof. The device comprises a control computer, an MCU single chip, a high-precision digital-analogue converter and a constant temperature crystal oscillator; the control computer is used for converting an appointed voltage value into a serial instruction to output to the MCU single chip; the MCU single chip is used for converting the serial instruction into a binary instruction in tri-channel 24bit so as to transmit to the high-precision digital-analogue converter as an analogue time sequence; the high-precision digital-analogue converter is used for producing appointed analogue voltage amount to control the frequency of the constant temperature crystal oscillator. Electric control voltage resolution of the constant temperature crystal oscillator is improved to achieve 7.82muV; a constant control voltage is given to the constant temperature crystal oscillator, the stability of the output frequency achieves the nominal extremity which is 7.8*10<-14>(@average time: 8s); only one serial port of the computer is occupied and a data acquiring card channel cannot be occupied, thus the control process to the constant temperature crystal oscillator is simplified; the short-term stability of the constant temperature crystal oscillator after being locked by an atom fountain device achieves 2.8*10<-13>tau<-1 / 2>.

Description

technical field [0001] The invention relates to a high-precision frequency control method of a constant temperature crystal oscillator (OCXO), which is suitable for fields such as atomic frequency standards and the like that require high control resolution and stability of output frequency signals. Background technique [0002] Crystal oscillators are widely used as frequency signal sources. According to the working principle, crystal oscillators can be divided into temperature compensated crystal oscillators (TCXO), voltage controlled crystal oscillators (VCXO), constant temperature controlled crystal oscillators (OCXO) and other types. Among them, constant temperature crystal oscillators have Due to the advantages of low phase noise and high stability, it can be used as a local oscillator in atomic clock systems for timekeeping and time service. [0003] As shown in the doctoral thesis "Operation and Performance Evaluation of Rubidium Atomic Fountain Clock", the voltage c...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor frequency stability of the constant temperature crystal oscillator in the prior art, improve the resolution of the control voltage of the constant temperature crystal oscillator, and improve the short-term stability of the constant temperature crystal oscillator output frequency

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