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Phase information recoverable sweep frequency source method

A phase information, frequency sweep source technology, used in special data processing applications, measurement devices, instruments, etc., can solve problems such as error, impulse response and step response unusable

Inactive Publication Date: 2002-12-18
BEIJING UNIV OF TECH
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Problems solved by technology

If it is assumed that each frequency component has a zero phase at this time, it will cause a large error when transformed into the time domain, and the constructed impulse response and step response cannot be used

Method used

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  • Phase information recoverable sweep frequency source method
  • Phase information recoverable sweep frequency source method
  • Phase information recoverable sweep frequency source method

Examples

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Embodiment Construction

[0028] First, add the calibrated equal-amplitude sine wave signal output by the sweeping source to the input of the channel (Y channel) of the oscilloscope according to the conventional method, and then adjust the synchronization state of the oscilloscope to ensure that the amplitude-frequency response will be obtained on the oscilloscope. The amplitude-frequency response of the oscilloscope can also be measured by the usual point-frequency method.

[0029] Collect the amplitude-frequency response data of the oscilloscope into the computer processor, first preprocess the data, and then perform corresponding processing and calculation. The specific implementation steps are as follows: image 3 shown. 1. Preprocess the amplitude-frequency response data of the oscilloscope, see the attached Figure 4 Data preprocessing subroutine. 2. Take the logarithm

[0030] pair|H(e jω )|Take the natural logarithm, get ln|H(e jω )|. 3. Use Hilbert transform to realize ln|H(e jω )|to ln...

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Abstract

The method of sweep frequency source with restorable phase information belongs to metric testing field. It takes advantage of Hilert transform to restore its lost phase information on the basis of sweep frequency source calibrating method of broadband sampling oscilloscope, thus reconstructs step response of oscilloscope. In this method, sweep frequency source (1) outputs adjusted constant amplitude sine-wave sweep signal, oscilloscope (2) receives amplitude-frequency response of oscilloscope, then it finished the process of data in computer process (3). The processing step includes: preprocess of data of amplitude-frequency through widening frequency-field window and adding certain-amplitude noise to data of prolongation; then, it restores the phase with Hilbert transform in order to receive intact data including amplitude-frequency and phase-frequency response.

Description

technical field [0001] A frequency sweep source with recoverable phase information belongs to the field of metrology and testing. It is based on the frequency sweep source calibration method of wideband sampling oscilloscope, using Hilert transform to recover the phase information lost by the frequency sweep source method, so as to reconstruct the step response of the oscilloscope and realize the precise calibration of the oscilloscope. Background technique [0002] Calibration methods for wideband systems (wideband sampling oscilloscopes) include exhaustive model method, standard pulse method, "NTN" (nose-to-nose) calibration technique and swept source method. Each of these methods has advantages and disadvantages. The detailed model method is limited by the size of the circuit, and its calibrated system bandwidth is below ten GHz. The standard pulse method requires a pulse source with known parameters that is faster than the system being calibrated, which is sometimes di...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R29/00G01R29/02G01R35/00G06F17/00
Inventor 刘明亮李梅朱江淼
Owner BEIJING UNIV OF TECH
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