Waveform synchronization method and system for virtual instruments

A waveform synchronization and virtual instrument technology, applied in the field of virtual instruments, can solve problems such as initial phase error, signal display is not smooth, waveform display jitter, etc.

Inactive Publication Date: 2017-12-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, when the virtual instrument is displayed, if the number of sampling points per cycle is too small, on the one hand, the signal display will not be smooth, and on the other hand, due to the initial phase error, the waveform display will jitter

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  • Waveform synchronization method and system for virtual instruments
  • Waveform synchronization method and system for virtual instruments

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Embodiment Construction

[0060] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0061] Such as image 3 As shown, it is a flow chart of an embodiment of the waveform synchronization method of the virtual instrument of the present invention. In the method for synchronizing the virtual system of the present embodiment, the following steps are mainly included:

[0062] S1. Add a random noise sequence to the input signal. The input signal is collected by the hardware part of the virtual instrument. refer to Figure 4 , which is a waveform diagram of a sine wave signal after adding a random noise sequence, with a frequency of 95M.

[0063] S2. Sampling the input signal after adding the random noise sequence, the sampled signal has adjacent first frame signal and second frame signal. In the actual p...

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Abstract

The invention discloses a waveform synchronization method and system for virtual instruments. A random noise sequence is added to an input signal; the input signal containing the random noise sequence is sampled; curve fitting is carried out on a first frame of signal and a second frame of signal with the random noise sequence added through a constrained least squares learning method; whether the first frame of signal and the second frame of signal after curve fitting match each other is determined; if the first frame of signal and the second frame of signal after curve fitting match each other, the matching translation parameter is obtained through a genetic algorithm, the waveform after matching is obtained, the signal after matching is reconstructed, and the tail data redundant relative to the first frame of signal in the signal after matching is moved to the header data missing relative to the first frame of signal in the signal after matching. By using the waveform synchronization method and system for virtual instruments provided by the invention, when an ADC chip in a virtual instrument collects data of a periodic signal, the lateral translation jitter of the signal is small.

Description

technical field [0001] The invention relates to the field of virtual instruments, in particular to a waveform synchronization method and system for virtual instruments. Background technique [0002] The advancement of instrument technology and modern testing technology has promoted the development of a new concept instrument - Virtual Instrument (Virtual Instrument, referred to as VI). The virtual instrument uses computer to develop the instrument, the hardware part completes the data acquisition function, and the software part completes the data analysis and processing function. A crucial link in virtual instruments is AD (analog-to-digital) acquisition, and high-speed AD acquisition is a difficult point restricting the development of virtual instruments. During the research on virtual instruments, we found that when high-speed ADC chips (such as greater than 500Mbps sampling rate) are used to collect data from high-frequency periodic signals and display them on the virtua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王广君刘刚徐彩凤
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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