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Frequency spectrum detector rapid frequency sweeping system and method

A detector and fast technology, applied in the field of communication testing, can solve problems such as the signal spectrum that affects the observation of rapid changes

Inactive Publication Date: 2018-09-18
NANJING GUORUI ANTAIXIN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, when RBW=1k, the update time of one frame on the screen takes about 6S, which greatly affects the frequency spectrum for observing fast-changing signals

Method used

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  • Frequency spectrum detector rapid frequency sweeping system and method
  • Frequency spectrum detector rapid frequency sweeping system and method
  • Frequency spectrum detector rapid frequency sweeping system and method

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] Such as figure 2 Described, the present invention provides a kind of fast frequency sweeping system of spectrum detecting instrument, comprise following content: comprise AD module, n direct digital frequency synthesizer DDS combination, CIC filter, HB filter, RBW filter, cordic module, VBW module, small bucket, small bucket data merge module, large bucket, display module, where n is an odd number greater than 1. Each group of DDS is combined, the COS signal end of a DDS is connected to the input end of the mixer Ⅰ, and the SIN signal end of the DDS is connected to the input end of the mixer Ⅱ; the input ends of the mixer Ⅰ and the mixer Ⅱ are also connected with the output of the AD module The output terminals of mixer I and mixer II are respectively connected to a CIC filter, the output terminal of each CIC filter is connected to the input terminal...

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Abstract

The invention discloses a frequency spectrum detector rapid frequency sweeping system and method; a simulation signal outputted by a radio frequency module is sampled by an AD and mixed with DDS, wherein the frequency f of the DDS in the middle path is same with the central frequency outputted by the radio frequency module; frequencies of other DDSs are respectively set as f+ / - (n-1)*f1 / 2, i.e., symmetrically arranged, wherein f1 refers to the sweeping width of each bucket; a CIC filter and a HB filter can finish data extraction and underclocking; a RBW filter can finish waveform formation; acordic module is directly invoked to solve an amplitude value and a phase value, a signal is smoothed by a VBW module, and the small bucket is fetched; a small bucket data merging module can merge thefetched data of n paths of small buckets into one path according to a frequency big-to-small principle; various demodulations can be realized under large bucket signal control, and the data is finally sent to a display module.

Description

technical field [0001] The invention relates to a fast frequency scanning system and method of a spectrum detector, in particular to a place where a spectrum monitoring analyzer monitors the frequency spectrum of a rapidly changing signal, and belongs to the field of communication testing. Background technique [0002] At present, the sweeping structure of the commonly used spectrum detector at home and abroad is as follows (generally implemented by FPGA, assuming that the output of the RF module is a 10.7M intermediate frequency signal): [0003] If the AD sampling rate is 100M, after decimation and reduction, the sampling rate in some RBW gears becomes: [0004] Table I [0005] [0006] If the screen needs to display 501 points (that is, the total number of large buckets), in order to display a point, that is, a large bucket point, it is assumed that three small buckets are required to produce a large bucket point, that is, the number of times to control the RF module...

Claims

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Application Information

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IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 钟景华吴太阳王锋钱张宏张燕
Owner NANJING GUORUI ANTAIXIN TECH
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