Ultra-high resolution phase difference measurement method

This paper reveals the quantized phase step phenomenon between every two cyclical signals and its characteristics. With these characteristics, ultra-high resolution phase difference measurement limited by the quantized phase step and its corresponding measurements can be achieved. The princple that the quantized phase steps between two radio frequencies are usually less than picosecond, femtosecond and even sub-femtoseconds, namely, the princple that the corresponding equivalent phase comparison frequency between two radio frequencies can enter into the microwave or light bands is also revealed, which provides a foundation for the precise link based on phase group processing between frequencies in different bands. In this paper, an ultra-high resolution phase difference measurement method based on the quantized phase step phenomenon and the phase coincidence detection is proposed. By introducing an intermediate frequency, this method utilizes the quantized phase step phenomenon between the measured frequency and the intermediate frequency to measure the phase difference. Highspeed A/D sampling and data processing are used to improve the phase coincidence detection accuracy.