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A measurement method and device for eliminating random interference of local oscillator phase

A technology of random interference and measurement methods, which is applied in the directions of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., and can solve problems such as random jumps in phase spectrum measurement results

Active Publication Date: 2020-11-10
NAT INST OF METROLOGY CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a measurement method and device for eliminating random phase interference of the local oscillator, and solves the technical problem in the prior art that the phase information of the intermediate frequency measurement contains the random component introduced by the local oscillator, so that the phase spectrum measurement results show random jumps

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  • A measurement method and device for eliminating random interference of local oscillator phase
  • A measurement method and device for eliminating random interference of local oscillator phase
  • A measurement method and device for eliminating random interference of local oscillator phase

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Embodiment 1

[0026] Such as figure 1 As shown, it is a flowchart of a measurement method for eliminating random phase interference of local oscillators provided by Embodiment 1 of the present invention, including:

[0027] Step 101, acquiring a radio frequency signal to be tested;

[0028] Step 102. Obtain a frequency-sweeping local oscillator signal according to the frequency point to be tested of the radio frequency signal to be tested;

[0029] Among them, since the signal under test contains multiple frequency components, frequency sweep measurement is required, and each frequency point is measured sequentially according to the frequency sweep interval each time. Step 102 may specifically include:

[0030] Step 102-1, subtracting or adding the frequency of the intermediate frequency component to the frequency of the frequency point to be measured and dividing by the harmonic order k of the mixing frequency as the frequency of the frequency sweep local oscillator signal corresponding ...

Embodiment 3

[0054] like image 3 Shown is an application example of a measurement method for eliminating local oscillator phase random interference provided by Embodiment 3 of the present invention, as follows:

[0055] The measured signal is a periodic repeated multi-frequency sinusoidal signal. Set the frequency of point frequency source 1 to f ref , the frequency of point frequency source 2 is f IF . The mixer works in the down conversion state of the third harmonic frequency mixing.

[0056] Step 1: Set the baseband arbitrary waveform generator to continuously and uninterruptedly output a periodic signal with multiple frequency components according to the frequency interval of the signal under test (that is, the frequency sweep interval of the measurement), so that the repetition frequency is one-Nth of the frequency sweep interval (N is a positive integer). For any measured frequency point f, ensure that the local oscillator signal (frequency f lo =(f-f IF ) / 3) have a stable f...

Embodiment 4

[0067] like Figure 4 Shown is an application example of a measurement method for eliminating random phase interference of local oscillators provided by Embodiment 4 of the present invention, as follows:

[0068] like Figure 4 Shown is a modified vector network analyzer where the test stimulus provides a multi-frequency sinusoidal signal. The signal to be tested is the input and output A of each port of the power amplifier PA 1 ,B 1 ,A 2 ,B 2 (both are multi-frequency sinusoidal signals). When the vector network analyzer works in the down-conversion measurement mode of the fundamental frequency mixing:

[0069] Step 1: According to the frequency interval of the signal under test (i.e. the measured frequency sweep interval), set the modulation signal generator to continuously and uninterruptedly output a periodic signal with multiple frequency components, so that the repetition frequency is one-Nth of the frequency sweep interval ( N is a positive integer). For any mea...

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Abstract

The invention relates to the field of phase measurement, and discloses a measurement method and device capable of removing the phase random interference of a local oscillator. The method comprises thesteps: obtaining a measured radio frequency signal; performing the k-th harmonic frequency mixing of the measured radio frequency signal and a sweep frequency local oscillator signal, and measuring aphase value of an intermediate frequency component of a down-converted signal as a first phase value; acquiring the sweep frequency local oscillator signal according to a to-be-measured frequency point of the measured radio frequency signal; performing frequency conversion processing of the sweep frequency local oscillator signal, and measuring a phase value of at least one frequency component ofthe signal as a second phase value after frequency conversion; eliminating the phase random interference of the sweep frequency local oscillator signal according to the second phase value to obtain aphase value of the to-be-measured frequency point. Through the frequency conversion processing of a local oscillator signal, the method achieves the phase measurement at a specific frequency point toobtain a random variation amount of the local oscillator phase in the frequency sweeping process.

Description

technical field [0001] The invention relates to the field of phase measurement, in particular to a measurement method and device for eliminating random interference of local oscillator phase. Background technique [0002] The measurement methods for radio frequency microwave signals are generally based on down-conversion technology, through the frequency mixing of the measured signal and the local oscillator signal, the frequency component of the higher frequency measured signal is converted to a lower frequency (intermediate frequency) for measurement . The technical bottleneck of this measurement method is that it cannot effectively control the phase of the local oscillator signal during the "frequency sweep" process, resulting in the phase information measured by the intermediate frequency containing random components introduced by the local oscillator, which makes the phase spectrum measurement results show random jumps. Therefore, the spectrum analyzer based on down-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/28
CPCG01R27/28
Inventor 张亦弛何昭郭晓涛黄见明张子龙聂梅宁杨瑷宁
Owner NAT INST OF METROLOGY CHINA
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