Method for correcting frequency of heterodyne type frequency 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 spectrum accuracy, and improving adoption efficiency

Inactive Publication Date: 2014-03-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF5 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the accuracy of the LO tuning point of the local oscillator is limited. When the FM step control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for correcting frequency of heterodyne type frequency spectrum analyzer
  • Method for correcting frequency of heterodyne type frequency spectrum analyzer
  • Method for correcting frequency of heterodyne type frequency spectrum analyzer

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for correcting the frequency of a heterodyne type frequency spectrum analyzer. The method comprises the following steps: when signals are sent into the heterodyne type frequency spectrum analyzer for processing, judging the resolution bandwidth RBW; if when the RBW is more than 10-time fmin, carrying out amplification or compression on the signals by adopting a filter scanning method, carrying out envelop detection, and carrying out filtering processing on videos to obtain frequency spectrums of the signals; and when the RBW is less than or equal to the 10-time fmin, transforming difference values between recorded tuning frequency-point values and actual sending tuning frequency point values into errors of data points by adopting an FFT (Fast Fourier Transform) scanning method after FFT transformation to eliminate frequency-spectrum errors so as to improve the recognition accuracy of the frequency spectrums.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R23/165
Inventor 罗光坤郭连平张勋张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap