High-precision time measurement device and method based on redundant state information of delay ring

Abstract

The invention belongs to the field of high-precision time-frequency measurement, and specifically discloses a high-precision time measurement device and method based on redundant state information of a delay ring. It includes a delay loop interpolator, a delay loop logic gate state information latch module, a redundant state information time series storage module and a measurement data statistical analysis module. The delay loop interpolator consists of logic gates with dedicated carry chains, enabling first-order interpolation subdivisions. The state information latch module of the delay loop logic gate and the redundant state information time sequence storage module realize the subdivision circuit of the redundant state information, synchronously latch the output state information of the delay loop logic gate, and carry out the second order for the delay loop interpolator Equivalent subdivision, the measurement data statistical analysis module analyzes and calculates the measurement results. The invention utilizes the inconsistency characteristic of transmission delay inherent in the FPGA logic gate, and realizes the second-order subdivision of the delay loop interpolator through redundant state information subdivision circuits, so as to improve time measurement resolution and measurement accuracy.

Description

technical field [0001] The invention belongs to the field of high-precision time-frequency measurement, and more particularly relates to a high-precision time measurement device and method based on redundant state information of a delay loop. Background technique [0002] Time measurement is an important measurement technology in modern metrology. This technology can accurately measure the time interval between two physical events. At present, high-precision time interval measurement equipment is widely used in basic research and engineering applications, such as quantum communication, Time-resolution spectral analysis, laser ranging, biomedical imaging and other fields. The time-to-digital converter based on FPGA is one of the most popular and high-precision time interval measurement methods at present, and has the characteristics of short implementation period, low cost, and strong adaptability. [0003] However, the time measurement resolution of the existing FPGA-based ...

AI Technical Summary

Problems solved by technology

[0003] However, the time measurement resolution of the existing delay loop reduction method based on FPGA is low. At the same time, in the traditional second-order time measurement method, the first-order measurement circuit and the second-order measurement circuit are executed sequentially. , the time measurement speed will decrease

At the same time, each additional level of measurement circuit will affect the time measurement speed and dead time

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