An all-digital peak arrival time identification method

A time identification and all-digital technology, which is applied in the direction of measuring, measuring devices, and instruments using digital measurement technology, can solve the problems of complex circuit structure, difficult expansion, and insufficient detection accuracy, and achieve a simple hardware circuit structure that is conducive to expansion , reduce the effect of random walk

Inactive Publication Date: 2017-07-14
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the problems of insufficient detection accuracy or complex circuit structure and difficult expansion in the existing technology, the present invention provides a fully digital peak arrival time identification method

Method used

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  • An all-digital peak arrival time identification method

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Embodiment Construction

[0025] The inventive idea of ​​the present invention is:

[0026] Using all-digital technology, by measuring the arrival time of the rising edge and the arrival time of the falling edge of the signal, and calculating the peak arrival time according to the symmetry characteristics of the pulse signal itself, it can accurately identify the peak arrival time of the pulse signal with a certain symmetry. It can be used in laser or radar signal ranging, high-energy physical particle arrival time detection, etc., to overcome the random walk of arrival time caused by signal strength, and realize high-precision detection of pulse signal arrival time

[0027] The present invention uses a high-speed comparator and FPGA to realize a scalable single-channel or multiple-channel pulse signal peak arrival time identification system for signals with a certain symmetry of rising and falling edges, including:

[0028] The high-speed comparator corresponding to the number of signal channels to be tested...

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Abstract

The present invention relates to an all-digital peak arrival time identification method, comprising the following steps: using a high-speed comparator equal in number to the signal to be tested, and comparing with a preset threshold signal, when the signal is greater than the preset threshold, the output is "1", otherwise output "0", the signal to be tested is converted into a digital pulse signal; the signal to be tested is one or more analog pulse signals with a certain symmetry with rising and falling edges; measured by FPGA chip After the rising edge time and falling edge time of the digital pulse signal; according to the rising edge time and falling edge time, calculate the peak arrival time of the signal to be measured. This method has a simple hardware circuit, is easy to implement, and is easy to expand multi-channels. At the same time, compared with the existing technologies such as constant ratio timing and peak detection, the hardware circuit is greatly simplified, and the timing accuracy is similar. It has stronger advantages in the field of multi-channel signal processing. practicality and feasibility.

Description

Technical field [0001] The present invention relates to the field of discriminating the arrival time of pulse signals, in particular to a fully digitalized peak arrival time discrimination method. Background technique [0002] In the fields of laser ranging and high-energy physics, applications such as high-resolution ranging and particle discrimination require precise measurement of the arrival time of pulse signals. At present, common methods for determining the arrival time include edge detection, peak detection, and constant ratio timing detection. The edge detection method is simple to implement and low cost, but it is greatly affected by the signal echo intensity. As the signal amplitude changes, the arrival time will travel in a larger range, and its range of change is approximately proportional to the width of the rising edge of the pulse signal . Peak detection acquires high-resolution signal waveforms through high-speed sampling, and determines the peak position throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/175G01R19/25
Inventor 王飞王挺峰郭劲
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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