High-precision frequency measurement method and system based on edge detection

The invention discloses a high-precision frequency measurement method and system based on edge detection, and belongs to the technical field of time frequency measurement, and the system comprises a shaping module, a reference clock module, an edge detection module, a digital decimation filtering module, a frequency division module, a data processing module and a display module. A reference clock signal is generated by taking a high-precision clock source as a reference clock; the method comprises the following steps: detecting a rising edge and a falling edge of a detected signal shaped into a square wave signal by using a reference clock to obtain a quantized output bit stream of the detected signal, demodulating the bit stream and reducing a signal output rate to obtain demodulated data, and processing the demodulated data to obtain the frequency of the detected signal. According to the method, the measurement precision and the measurement speed are improved through edge detection and digital filtering, an