Full-digital frequency stability measuring method and system

The invention discloses a full-digital frequency stability measurement method and system, and the method achieves the regulation and control of a constant-temperature crystal oscillator through a Beidou wide-area precise timing system, and forms a reference frequency source with the long-term stability and short-term stability. A to-be-measured frequency source and a reference frequency source are converted into digital signals from analog signals through a low-noise front end, frequency and phase information of the digital signals is solved through a full-digitalization phase discrimination system, and after digital signal operation, frequency stability parameters are solved. Aiming at the problems that a traditional frequency stability measuring device is not provided with a built-in reference source, and a traditional analog device is too large in measurement background noise, high-precision measurement of time-frequency signals is achieved by combining a Beidou wide-area time service system and a full-dig