Research on time reference determination and phase calibration method of high precision measurement system

Aiming at the requirements of time reference determination and phase calibration of high-precision measurement systems, a high-precision phase determination and calibration method of time reference is proposed to solve the problem of low calibration accuracy in the system. This method uses FPGA delay lines to perform time reference Delay control combined with phase jump detection technology. First, accurately determine the interval where the phase transition occurs when the time reference is sampled by the system clock; second, accurately measure the delay value required to stabilize the time reference, and finally perform the time reference internal delay, and system synchronization of the delayed time reference. The proposed method has the characteristics of high calibration accuracy and low complexity. A simulation verification platform was built and the functional verification of the proposed method was performed in conjunction with a computer. The method has been applied to highprecision measurement systems.