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Determination method for distortion degree of random waveform

A technique of arbitrary waveform and determination method, applied in measurement devices, instruments, measurement of electrical variables, etc., can solve the problems of not seeing the introduction, cumbersome steps, analysis errors, etc., to achieve simple and easy steps, improve accuracy, and avoid measurement. effect of error

Inactive Publication Date: 2014-05-28
BEIHANG UNIV +1
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Problems solved by technology

[0005] For the measurement of general form (arbitrary) waveform distortion, a measurement method is given in JJF1152-2006 "Arbitrary Waveform Generator Calibration Specification", but the steps of this method are cumbersome and require time-frequency domain conversion calculation process, so that It is bound to bring corresponding analysis errors due to problems such as whole-period sampling
However, in other literatures, there is no introduction of relevant content

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  • Determination method for distortion degree of random waveform
  • Determination method for distortion degree of random waveform
  • Determination method for distortion degree of random waveform

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Embodiment Construction

[0028] Arbitrary waveform (total) distortion is defined as: the ratio of the effective value of the residual error between the actual waveform of the periodic signal and its optimal expected waveform to the effective value of the AC component of the optimal expected waveform. That is, for a known signal x(t) whose period is T, its actual waveform function is y(t), and there are G, Q, t 0 ∈R, and f(t)=G x(t-t 0 )+Q, so that:

[0029] ρ = 1 T ∫ 0 T ( y ( t ) - f ( t ) ) 2 dt = 1 T ...

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Abstract

The invention discloses a determination method for the distortion degree of random waveform. The method comprises the following implementation steps: (1) sampling to acquire random waveform of a known model; (2) sampling the known model by adopting the same sampling velocity, and searching the sampling waveform obtained actually by 'alignment' by using nonlinear least squares fitting algorithm so as to obtain a model sampling sequence of 'alignment'; (3) acquiring am optimal expectation curve of a tested sampling sequence according to the model sampling sequence of 'alignment' obtained according to the search; and (4) calculating according to the obtained tested random waveform sampling sequence and the optimal expectation curve thereof so as to obtain the distortion degree of the tested random waveform. The determination method for the distortion degree of random waveform, which is provided by the invention, is low in operand, is low in testing process requirement, that is, the accurate full period sampling and the like are not required, and the determination method is easy to implement, and can greatly improve the measurement accuracy.

Description

technical field [0001] The invention relates to a method for determining the degree of distortion of an arbitrary waveform, belongs to the technical field of signal processing and testing, and is mainly used in evaluating the quality of complex (arbitrary) testing signals. Background technique [0002] In waveform measurement, the quality of the actually acquired signal, that is, the consistency between the actual signal and the original signal (or the expected signal), is the first concern, otherwise the credibility of the measurement results will be questioned. Usually, for "simple" waveforms, the consistency of the two is usually described using typical parameters of these waveforms, such as amplitude, frequency, time or phase offset, amplitude offset, etc. of the waveform; further, including the " Area" (such as effective value), statistical characteristics and other parameters. [0003] But for complex waveforms (such as "arbitrary waveforms" in the general sense), the...

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Application Information

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IPC IPC(8): G01R29/00
Inventor 孙璟宇王中宇梁志国
Owner BEIHANG UNIV
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