A frequency signal acquisition and data processing method and device
A data processing device and frequency signal technology, which is applied in the direction of frequency measurement device, etc., can solve the problems affecting the mean value solution, different pulse width, signal waveform elongation, etc., and achieve the effect of improving accuracy
Active Publication Date: 2020-11-24
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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However, when the sensor measures a dynamic signal, the output frequency signal fluctuates with the measured value. When the pulse width measurement is used for frequency measurement, the output data frame rate follows the fluctuation, resulting in the obtained pulse width being different from the equal-step sampling data. The signal waveform is elongated at the high frequency point; it is shortened at the low frequency point, which affects the mean value solution and affects the signal processing of the sensor
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[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.
[0018] Such as figure 1 As shown, the abscissa is time, figure 1 The upper part is the pulse signal, which is the sensor converts the detected voltage information into a pulse signal. The pulse signal is a square wave signal, the ordinate is the amplitude, and the amplitude is 5V. The voltage is obtained by measuring the pulse width of the pulse signal. The signal, specifically, the period of the pulse signal is measured and the period is derived to obtain the frequency signal. The frequency signal corresponds to the voltage signal one-to-one to obtain the voltage signal. The frequency of the pulse signal can linearly correspond to the voltage signal. It is also possible to adopt a nonline...
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The invention provides a frequency signal acquisition and data processing method and device, and particularly aims to solve the problems of signal waveform deformation distortion and deviation betweenan average value and a true value during dynamic fluctuation of a measured analog quantity. When the measured analog quantity fluctuates dynamically, the pulse width of a frequency output signal fluctuates along with the measured analog quantity, and when frequency measurement is carried out in a pulse width measurement mode, the frame rate of output data fluctuates along with the measured analogquantity, so that the obtained pulse width data is different from equal-step-length sampling data, the signal waveform is lengthened at a high frequency point and shortened at a low frequency point,and then mean value solving is affected. According to the invention, the frequency value and the sampling interval are calculated at the same time according to the measured pulse width, the frequencyvalue output rate is uniformized by adopting a re-sampling method, and the waveform accuracy of analog quantity measurement is improved.
Description
Technical field [0001] This application relates to the field of signal processing, and specifically to the field of frequency signal acquisition and data processing methods and devices. Background technique [0002] Frequency signal output is a signal output method with strong anti-interference ability and convenient for wireless transmission, which is adopted by many types of sensors. Generally, the output frequency value linearly corresponds to the sensor measurement value. When the sensor measures a static signal, the frequency output signal remains stable, and there is no problem of signal waveform distortion and deviation of the average value. However, when the sensor measures dynamic signals, the output frequency signal fluctuates following the measured value. When the pulse width measurement method is used for frequency measurement, the output data frame rate fluctuates, resulting in the acquired pulse width different from the equal-step sampling data. The signal waveform...
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IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 柳庆林黄明其袁红刚彭先敏章贵川罗欢魏一博
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT