A Digital Spectrum Analysis Method with Variable Sweep Width

A technology of frequency sweep width and digital spectrum, which is applied in the field of spectrum analysis, can solve problems such as the inability to analyze sudden interference in wide frequency bands, frequency hopping transient signals, and spectrum mutation signals, etc., and achieves a simple structure, good real-time performance, and easy upgrade Effect

Active Publication Date: 2019-08-06
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0002] At present, most spectrum analyzers also use frequency sweep-based superheterodyne spectrum analysis mode, and only some spectrum analyzers use fast Fourier transform (FFT) when the sweep width (SPAN) is relatively low. Based on the spectrum analysis mode, such a spectrum analysis mode cannot analyze sudden frequency band interference, frequency hopping transient signals and other spectral mutation signals

Method used

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  • A Digital Spectrum Analysis Method with Variable Sweep Width
  • A Digital Spectrum Analysis Method with Variable Sweep Width
  • A Digital Spectrum Analysis Method with Variable Sweep Width

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] Such as figure 1 Shown, a kind of digital frequency spectrum analysis method of variable frequency sweep bandwidth, it comprises the following steps:

[0032] (1) The radio frequency unit converts the part of the frequency band to be analyzed contained in the input signal into the broadband intermediate frequency signal bandwidth suitable for high-speed A / D sampling, and the high-speed A / D module converts the input broadband intermediate frequency signal into a high-speed digital intermediate frequency signal.

[0033] (2) The FFT analysis module with variable sweep bandwidth performs FFT analysis on the digital intermediate frequency signal according to the required center frequency, SPAN, and frequency resolution...

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Abstract

The invention discloses a digital frequency spectrum analysis method with variable frequency sweep width, belonging to the technical field of frequency spectrum analysis. The invention includes the steps of converting the input signal into a broadband intermediate frequency signal, converting the broadband intermediate frequency signal into a high-speed digital signal, performing FFT analysis on the intermediate frequency digital signal, and subsequent conventional processing. The present invention has the advantages of wide real-time SPAN range, fast response speed, high degree of integration, simple hardware, and reliable performance. It not only provides broadband real-time spectrum analysis, but also can realize various relatively narrow-band real-time spectrum analysis. An important improvement.

Description

technical field [0001] The invention relates to the technical field of spectrum analysis, in particular to a digital spectrum analysis method with variable sweep width. Background technique [0002] At present, most spectrum analyzers also use frequency sweep-based superheterodyne spectrum analysis mode, and only some spectrum analyzers use fast Fourier transform (FFT) when the sweep width (SPAN) is relatively low. Based on the spectrum analysis mode, such a spectrum analysis mode is unable to analyze spectrum mutation signals such as sudden interference and frequency hopping transient signals in a wide frequency band. In order to adapt to the detection and analysis of spectral mutation signals, a real-time spectrum analysis mode has emerged. This mode is based on uninterrupted FFT analysis, and can complete real-time spectrum analysis without omission for input signals with a certain bandwidth. The bandwidth of current broadband satellite communication signals and radar si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 李强慈国辉张红涛高焕英李靖
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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