Electromagnetic background noise extraction method based on hierarchy-clustering algorithm

A background noise and extraction method technology, applied in the direction of noise figure or signal-to-noise ratio measurement, can solve the problems of low noise level and low intelligence, and achieve the effect of improving accuracy, scientificity and automation

Active Publication Date: 2013-08-28
BEIHANG UNIV
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Problems solved by technology

[0014] In order to overcome the shortcomings of the existing electromagnetic background noise measurement methods, such as low noise level and low

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  • Electromagnetic background noise extraction method based on hierarchy-clustering algorithm
  • Electromagnetic background noise extraction method based on hierarchy-clustering algorithm
  • Electromagnetic background noise extraction method based on hierarchy-clustering algorithm

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Embodiment

[0076] The method provided by the present invention is used to measure the electromagnetic background noise of 88-108MHz (FM broadcast). The measurement data is from a certain area for 9 consecutive days (from 2:30 on October 13, 2011 to 16:31 on October 21, 2011) ) On-site spectrum monitoring, the monitoring antenna is erected on the roof of a building (39°54'15″ east longitude, 116°24′27″ north latitude, about 40 meters above the ground). Monitoring equipment includes Agilent 9340B spectrum analyzer, data recording and storage computer, and CS-AOS30-3000V active omnidirectional antenna. The monitoring frequency band is set to 30-3000MHz, the frequency sweep resolution is 100kHz, the number of frequency points sampled in each sweep is 29,800, and 1815 time points of "spectrum-field strength" data samples are continuously measured during the spectrum monitoring time. 88-108MHz (FM broadcasting) electromagnetic background noise extraction can be divided into the following steps:...

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Abstract

The invention discloses an electromagnetic background noise extraction method based on a hierarchy-clustering algorithm and relates to the technical field of radio management. The extraction method includes the steps of firstly establishing a spectrum-field intensity data set obtained through frequency spectrum monitoring and scanning, secondly carrying out data subset division and filed intensity hierarchy on the spectrum-field intensity data set so as to obtain central field intensity values of each cluster, thirdly, sequencing the central field intensity values of the clusters to obtain electromagnetic background noise sample values, and finally forming an electromagnetic background noise sample sequence and obtaining electromagnetic background noise levels in unit time. The electromagnetic background noise extraction method based on the hierarchy-clustering algorithm improves scientificity and automation degrees of electromagnetic background noise measurement, effectively overcomes the defect that an estimated noise value is lower than a real value due to the fact that actual wireless system emission factors are not considered in noise curves given by the ITU-RP.372 method, changes the mode that free frequency point field intensity is selected manually as noise sample values in the ITU-RP.372 method, and improves accuracy of electromagnetic background noise computation.

Description

Technical field [0001] The invention relates to the technical field of radio management, in particular to a method for extracting electromagnetic background noise based on a layered-clustering algorithm, which can be applied to electromagnetic background noise measurement, spectrum occupancy statistics, electromagnetic environment analysis and evaluation, etc. in radio monitoring. Background technique [0002] Electromagnetic background noise measurement is an important test content in the daily radio monitoring of radio management departments, and it is also the main reference for determining the statistical threshold of spectrum occupancy. At present, most radio monitoring stations in my country measure the value of electromagnetic background noise mainly based on the spectrum curve or empirical value displayed by the monitoring receiver. In the spectrum occupancy statistics, according to the <Interim Provisions on Radio Spectrum Monitoring Statistics Report> "Notice", wh...

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Application Information

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IPC IPC(8): G01R29/26
Inventor 谢树果王磊苏东林谷晓鹏叶知秋
Owner BEIHANG UNIV
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