Time domain distance testing method and device

Abstract

The invention relates to a time domain distance testing method and device. The method comprises steps that a set of equal-interval test signals is sent to a to-be-tested device to acquire reflection signals; the reflection signals are received, and simulation signal filtering of the reflection signals is carried out to filter far-end noise and stray signals; the reflection signals after filteringare converted into digital signals; digital signal filtering of the digital signals is carried out to filter near-end noise and stray signals; time domain windowing of the reflection signals after filtering of the digital signals is carried out; the reflection signals after time domain windowing are transformed to a frequency domain; amplitude and phase of the frequency domain reflection signals are solved; whether the amplitude and the phase of all the reflection signals are acquired is determined, if yes, the amplitude and the phase of all the reflection signals form a frequency domain complex number sequence; the frequency domain complex number sequence is transformed to a time domain to acquire time domain impact response, and the peak point position of the time domain impact responseis calculated; the maximum time delay distance is calculated according to the peak point position of the time domain impact response.

Description

technical field [0001] The invention relates to the field of time-domain reflection measurement, in particular to a time-domain ranging method and device. Background technique [0002] Time Domain Reflectometry (TDR) was introduced in the early 1960s and works on the same principle as radar - sending an impulse signal into a cable under test (or other device or device under test which may not be a good conductor ), when the impulse signal reaches the end of the cable or a fault point on the cable, part or all of the impulse signal will be reflected back to the test instrument. The TDR measurement method is to send an impulse or step excitation signal to the device under test, and then observe the response of the signal in the time domain. During the test, use a step signal generator and a broadband oscilloscope, send the excitation signal with a very fast rising edge speed generated by the step signal generator into the transmission line under test, and then use a broadband...

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Problems solved by technology

[0007] However, the prior art does not see how to accurately measure the frequency, amplitude, and phase of each single tone signal fed back in this case

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