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Broadband sampling oscilloscope time base error synchronous compensation method and device

A technology of time base error and synchronous compensation, applied in the direction of measuring devices, instruments, digital variable display, etc., can solve the difficulty of accurately distinguishing between systematic errors and random errors, the inability to accurately estimate the probability density function and variance of jitter, and the deviation of correction results, etc. question

Active Publication Date: 2019-04-05
BEIJING UNIV OF TECH
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Problems solved by technology

On the one hand, this method is difficult to accurately distinguish between systematic errors and random errors, and the step-by-step removal of the time base algorithm will introduce greater uncertainty; on the other hand, it cannot accurately estimate the probability density function and variance of the jitter, making the convolution have a certain Deviation, which brings serious deviation to the correction result

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  • Broadband sampling oscilloscope time base error synchronous compensation method and device
  • Broadband sampling oscilloscope time base error synchronous compensation method and device
  • Broadband sampling oscilloscope time base error synchronous compensation method and device

Examples

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Embodiment 1

[0094] refer to figure 1, a kind of broadband sampling oscilloscope time base error synchronous compensation method, comprises the following steps:

[0095] Step S100: Synchronously trigger the signal under test and two reference signals that are approximately orthogonal, and simultaneously connect the reference signal and the signal under test to a broadband sampling oscilloscope for sampling.

[0096] Further, the step S100 includes:

[0097] Step S101, outputting the reference signal through the first signal generator, outputting the measured signal through the second signal generator, and synchronously triggering the sampling channels of the reference signal and the measured signal to obtain the same sampling time base;

[0098] Step S102, performing quadrature processing on the signal output by the first signal generator through the quadrature coupler, and sending the first signal and the second signal outputted after quadrature coupling to the first channel and the seco...

Embodiment 2

[0149] refer to Figure 6 , the embodiment of the present invention provides a broadband sampling oscilloscope timing error synchronization compensation device, including a synchronization trigger module 10, a model building module 20, an error estimation module 30 and a compensation module 40;

[0150] The synchronous triggering module 10 is used for synchronously triggering the measured signal and two approximately orthogonal reference signals, and simultaneously accessing the reference signal and the measured signal to a broadband sampling oscilloscope for sampling;

[0151] Described model construction module 20 is used for constructing error model according to two approximately orthogonal reference signals, constructs the time base error estimation model of broadband sampling oscilloscope according to described error model and orthogonal distance regression mathematical model;

[0152] The error estimation module 30 is configured to calculate a time base error estimated v...

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Abstract

The invention provides a broadband sampling oscilloscope time base error synchronous compensation method and device, and relates to the technical field of broadband sampling oscilloscopes. The broadband sampling oscilloscope time base error synchronous compensation method comprises the steps that a measured signal and two approximately orthogonal reference signals are synchronously triggered, andthe reference signals and the measured signal are simultaneously connected into the broadband sampling oscilloscope and sampled; an error model is constructed based on the two approximately orthogonalreference signals, and a time base error estimation model of the broadband sampling oscilloscope is constructed according to the error model and a orthogonal distance regression mathematical model; atime base error estimation value is calculated according to the time base error estimation model; and a time base error of the measured signal is compensated according to the time base error estimation value. The broadband sampling oscilloscope time base error synchronous compensation method and device can accurately estimate and compensate the time base error, thereby effectively improving the measurement accuracy of the broadband sampling oscilloscope and enabling the measurement results to have less uncertainty.

Description

technical field [0001] The invention relates to the technical field of width sampling oscilloscopes, in particular to a method and device for synchronously compensating time base errors of wideband sampling oscilloscopes. Background technique [0002] The time base error of the broadband sampling oscilloscope mainly includes time drift, time base distortion and time base jitter. The influence of the time base error of the broadband sampling oscilloscope is manifested as a deviation in the amplitude of the sampling signal in the time domain, and in the frequency domain as spectrum broadening or generation of The new frequency components lead to large deviations in the measurement results. In order to reduce the impact of the oscilloscope time base error on the measurement results, the Chinese Academy of Metrology has further improved the idea of ​​the least square method, using the least square method of multi-frequency and multi-phase to estimate the total time base error, a...

Claims

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Application Information

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IPC IPC(8): G01R13/02
CPCG01R13/0254G01R13/029
Inventor 朱江淼王世镖张菁王星
Owner BEIJING UNIV OF TECH
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