A Phase-Frequency Response Measurement and Compensation Method for Broadband Acquisition System
A phase-frequency response and acquisition system technology, applied in the field of communication processing, can solve the problems of phase-frequency measurement and compensation of broadband acquisition systems, without phase-frequency response compensation, and cannot apply frequency response compensation of broadband acquisition systems, etc., to reduce errors , The effect of reducing the frequency response calculation error
Active Publication Date: 2021-07-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0005] However, in existing patents, no matter the frequency response compensation method based on hardware circuit (CN201110448977) or digital filter (CN201810496002, CN201310686849) only compensates the amplitude-frequency response, and does not compensate the phase-frequency response
And although phase frequency compensation is mentioned in CN200910048198, this system is not a general broadband acquisition system, and its method cannot be applied to the frequency response compensation of the broadband acquisition system
[0006] In summary, there is currently no method to measure and compensate the phase frequency of the broadband acquisition system
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[0060] figure 1 It is a function division diagram of a typical broadband acquisition system.
[0061] A typical broadband acquisition system can be divided into four main modules according to functions, which are signal conditioning module, analog-to-digital conversion module, data processing module and control module, such as figure 1 shown. When collecting data, the control module firstly configures the circuit parameters in the signal conditioning module according to the user's requirements. The signal conditioning module amplifies or attenuates the input signal under the configuration of different circuit parameters to meet the input requirements of the analog-to-digital conversion module. The analog-to-digital conversion module converts the input analog signal into digital quantity and sends it to the data processing module. The data processing module performs data analysis, filtering and other operations on the digital quantity, or displays the data. Among the four m...
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The invention discloses a phase-frequency response measurement and compensation method of a broadband acquisition system. First, a standard fast edge signal is generated by an oscilloscope calibrator, and is sampled by the acquisition system to be measured and the reference system, and the sampling time of the two systems is not less than One fast edge signal cycle; then use interpolation and decimation to adjust the sampling results to make the sampling rates of the two systems consistent, and make the sampling rate satisfy: greater than or equal to the sampling rate of the system to be tested, and an integer multiple of the fast edge signal frequency; Then use the smoothed system phase frequency difference to calculate the group delay, and align the data accordingly, and then use the aligned data to calculate the phase frequency that needs to be compensated, and perform smoothing processing; finally design an all-pass filter to approximate the phase frequency or pair The phase frequency response of the system can be compensated by passing the group delay of the phase frequency and passing the subsequent sampling results through the all-pass filter.
Description
technical field [0001] The invention belongs to the technical field of communication processing, and more specifically relates to a phase-frequency response measurement and compensation method of a broadband acquisition system. Background technique [0002] With the development of material technology and the in-depth study of signal processing technology, the bandwidth of the acquisition system is also increasing. According to the different requirements in the actual project, according to the bandwidth of the input signal allowed by the system, the acquisition system can be roughly divided into broadband acquisition system and narrowband acquisition system. For the current broadband acquisition system, it is generally able to acquire signals from direct current to GHz level. The "bandwidth" defined in the broadband acquisition system generally refers to the -3dB bandwidth f B , that is, assuming that the signal amplitude at 0Hz is A 0 , then as the frequency of the input ...
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IPC IPC(8): H04L27/00
CPCH04L27/0014
Inventor 潘志翔叶芃杨扩军赵禹周镱
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA