A Method of Frequency Correction for Heterodyne Spectrum Analyzer

A spectrum analyzer and frequency correction technology, applied in the field of signal processing, can solve problems such as limited accuracy of LO tuning points, and achieve the effects of saving adoption time, improving adoption efficiency, and improving spectrum accuracy

Inactive Publication Date: 2015-12-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] However, the accuracy of the LO tuning point of the local oscillator is limited. When the FM step control word is increased or decreased by 1, the minimum tuning step that the LO tuning point can achieve is f min for:

Method used

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  • A Method of Frequency Correction for Heterodyne Spectrum Analyzer
  • A Method of Frequency Correction for Heterodyne Spectrum Analyzer
  • A Method of Frequency Correction for Heterodyne Spectrum Analyzer

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Embodiment

[0022] figure 1 It is a basic principle block diagram of the frequency correction method of the heterodyne spectrum analyzer of the present invention.

[0023] In this embodiment, the reference source is an oscillator, such as figure 1 As shown, the input signal of the present invention first passes through an attenuator to ensure that the signal is at an appropriate level when entering the mixer, thereby preventing overload, gain compression and signal distortion, and the signal passes through a low-pass filter after the attenuator , the main function of the low-pass filter in this place is to prevent the high-frequency signal from entering the mixer, prevent the out-of-band signal from mixing with the local oscillator, and produce an unnecessary frequency response at the intermediate frequency. Next, the signal generated by the reference oscillator is input to the local oscillator LO, and then input the signal to the mixer. However, the accuracy of the local oscillator LO t...

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Abstract

The invention discloses a method for frequency correction of a heterodyne spectrum analyzer. When the signal is sent to the heterodyne spectrum analyzer and processed, the resolution bandwidth RBW is judged. If the RBW>10 times fmin, the filter is scanned The signal is amplified or compressed by the method of envelope detection and video filtering to obtain the signal spectrum; when RBW≤10 times fmin, the difference between the recorded tuning frequency point value and the actual transmission tuning frequency point value is calculated by FFT scanning method After the FFT transformation, the errors converted into data points are eliminated for spectrum errors, thereby improving the accuracy of spectrum identification.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and more specifically relates to a method for frequency correction of a heterodyne spectrum analyzer. Background technique [0002] Spectrum analyzers can be divided into scanning spectrum analyzers and non-scanning spectrum analyzers according to their working principles. Scanning spectrum analyzers can be mainly divided into filter type and heterodyne type. The filter-type spectrum analyzer mainly uses a multi-channel filter spectrum analyzer, also known as a parallel filter. For different signal frequencies, different filters are used for processing, and finally the multi-tasking scanner transmits the signal to the screen for display, but This spectrum analyzer structure requires multiple sets of filters, which consumes a lot of resources and costs a lot. [0003] The heterodyne spectrum analyzer can realize multi-stage frequency conversion of high-frequency signals, so the sweep-ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/165
Inventor 罗光坤郭连平张勋张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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