Method for accurate time measurement and its measuring circuit

Abstract

The present invention discloses a precise time measuring method and a measuring circuit. The procedure is as follows: {1} an outside reference 1PPS pulse signal, an event signal to be measured and a 10 MHz standard signal are input, the first edge of a reference clock after the rising edge of the reference 1PPS pulse is extracted as a measuring pulse A and the first edge of the reference clock after the rising edge of the event signal to be measured is extracted as a measuring pulse B; {2} the interval between the measuring pulses A and B is computed out as the outlier time T 0 of the event to be measured; {3} the interval T 1 between the measuring pulse A and the 10 MHz standard signal, and the interval T 2 between the measuring pulse B and the 10 MHz standard signal are obtained through the tapped delay line method; {4} the precise time t e is obtained from the formula t e = t 1PPS + T 0 +T 1 -T 2, of which t 1PPS is the time code of the reference 1PPS. The tapped delay line technology of the present invention can output a primary time and frequency standard and can measure the event occurrence time precisely of multi nodes under a unified primary time and frequency standard.

Description

technical field [0001] The invention mainly relates to the application field of wide-area measurement and control technology, in particular to a precise time measurement method and a measurement circuit for precise measurement of event occurrence time in wide-area measurement and control applications. Background technique [0002] With the rapid development and wide application of distributed wide-area measurement and control technology, in order to realize applications such as synchronous testing of the same object by different nodes, it is necessary not only to establish a unified time between nodes, but also to perform accurate measurement at the moment when the same object at different nodes generates an event . The core work of accurate measurement of event occurrence time is the accurate measurement of time interval, that is, the time interval between the time occurrence time relative to a certain precise reference time. The traditional counter method to measure the t...

AI Technical Summary

Problems solved by technology

The traditional counter method of measuring the time when the event occurs is difficult to achieve high measurement accuracy due to the limitation of the operating clock frequency of the circuit.

For example, when the measurement accuracy of 1ns is required, the clock frequency needs to be increased to 1GHz. At this time, it is difficult for the general counter chip to work normally, and it will also bring many problems such as circuit board wiring, material selection and processing.

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