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FPGA-based high precision time interval measurement method and system

A technology of time interval measurement and time interval, which is applied in the direction of electrical unknown time interval measurement, devices and instruments for measuring time interval, etc. It can solve the problems of narrow measurement range and difficulty in meeting engineering needs, achieve high measurement accuracy and reduce flipping noise and the effect on the probability of occurrence of metastable phenomena

Inactive Publication Date: 2019-11-12
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

The typical resolution of the TDC chip measurement is 50ps, so it can accurately measure the phase difference at the nanosecond level; The measurement range is difficult to meet the actual engineering needs

Method used

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  • FPGA-based high precision time interval measurement method and system
  • FPGA-based high precision time interval measurement method and system
  • FPGA-based high precision time interval measurement method and system

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Embodiment Construction

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0032] This embodiment provides a method for measuring high-precision time intervals based on FPGA, and its work flow chart is as follows figure 1 As shown, the method includes the following implementation steps: using the pulse filling counting method to roughly measure the time interval between two pulses to obtain the rough measurement result of the time interval; based on the FPGA tap delay chain, the phase difference less than one clock cycle is measured. The fine measurement is to obtain the fine measurement result of the time interval; the final measurement result of the time interval is determined according to the rough measurement result and the fine measurement result.

[0033] In FPGA, there is a delay ti...

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Abstract

The invention relates to an FPGA-based high precision time interval measurement method. The method comprises the following steps: performing rough measurement on the time intervals between two pulsesby adopting a pulse filling counting method to obtain a rough measurement result of the time interval; based on an FPGA tap delay chain, performing fine measurement on a phase difference less than a clock cycle to obtain a fine measurement result of the time interval; and determining a final measurement result of the time interval according to the rough measurement result and the fine measurementresult. According to the method, a wide range of time intervals can be measured by combining the rough measurement and the fine measurement and utilizing the high precision time delay interval of tensof picoseconds of an FPGA delay unit. The invention also discloses an FPGA-based high precision time interval measurement system.

Description

technical field [0001] The invention belongs to the field of time interval measurement, and in particular relates to an FPGA-based high-precision time interval measurement method and system. Background technique [0002] With the rapid development of science and technology, time interval measurement, especially high-precision time interval measurement technology, plays an important role in scientific research, especially in navigation and positioning, satellite timing, laser ranging and other fields. It is also a research hotspot in the field of time-frequency measurement. [0003] Time interval measurement technology is generally used to measure the time interval between two or more physical events occurring successively, and at the same time convert the measured time interval into corresponding numbers, so this technology is also called time-to-digital conversion technology (Time to Digital Conversion Technology). Digital Conversion, TDC). There are many methods of time ...

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Application Information

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IPC IPC(8): G04F10/04
CPCG04F10/04
Inventor 蔡成林李响贾伟汪发胡佳沈文波曾武陵彭滨刘元成
Owner GUILIN UNIV OF ELECTRONIC TECH
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