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Electromagnetic wave signal amplitude attenuation and propagation distance relation curve fitting method

A technology of electromagnetic wave signal and amplitude attenuation, which is applied in the direction of frequency-to-phase shift conversion and frequency measurement devices, etc., which can solve the problems that the relationship between propagation distance and signal attenuation cannot be accurately measured, cannot be applied in the field, and the maintenance cost is high in the later period. , to achieve the effect of improving authenticity, reducing uncertainty, and improving detection characteristics

Pending Publication Date: 2021-11-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology

At present, RSSI positioning, which has been studied more, is mostly based on fingerprint positioning technology, which needs to establish a feature information database about geographical location information and received signal strength, which is difficult to deploy on site, and the post-maintenance cost in the field implementation is relatively high
In addition, PD positioning technology based on the relationship between signal amplitude attenuation characteristics and propagation distance has also been widely studied. The main reason for limiting this positioning method is that the relationship between propagation distance and signal attenuation cannot be accurately measured.
The free-space propagation model is a straight-line propagation model of the signal between the signal source and the receiver in an ideal environment. The two-line ground reflection model considers the influence of two different propagation media, the earth and the air, on signal transmission. Both models are There are large usage restrictions and cannot be applied in the field

Method used

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  • Electromagnetic wave signal amplitude attenuation and propagation distance relation curve fitting method
  • Electromagnetic wave signal amplitude attenuation and propagation distance relation curve fitting method
  • Electromagnetic wave signal amplitude attenuation and propagation distance relation curve fitting method

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Embodiment Construction

[0045] In order to better understand the technical solution of the present invention, the following will be described in detail through specific examples:

[0046] A method for fitting the relationship curve of electromagnetic wave signal amplitude attenuation and propagation distance, comprising the following steps:

[0047] Step 1: In the signal outlier elimination step, the distribution of the collected signal data is regarded as a Gaussian distribution, and the probability density distribution conforms to N~(μ,σ 2 ), remove outliers in the data that are distributed outside the variance of 2 times the mean value;

[0048] Step 2 filtering step, using the Kalman filter algorithm to filter, including two stages of prediction and update;

[0049] The state equation and observation equation of the system are introduced into the prediction stage, such as the formula

[0050] x(k)=Ax(k-1)+Bu(k)+w(k) (1)

[0051] z(k)=Hx(k)+v(k) (2)

[0052] Among them, formula (1) is the differ...

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Abstract

The invention discloses an electromagnetic wave signal amplitude attenuation and propagation distance relation curve fitting method, which comprises the steps of step 1, signal abnormal value elimination: regarding the distribution of acquired signal data as Gaussian distribution, and eliminating abnormal values distributed outside the twice variance of an average value in the data when the probability density distribution meets N-(mu, sigma2); step 2, filtering by adopting a Kalman filtering algorithm; and step 3, fitting by adopting a semi-parameter regression model. Through the filtering method of the time acquisition sequence, the authenticity of the ultrahigh frequency receiving signal strength is improved, and on the basis, the fitting precision is improved by adopting the nonparametric regression model.

Description

technical field [0001] The invention relates to a fitting method for the relationship curve between electromagnetic wave signal amplitude attenuation and propagation distance used in the field of substation partial discharge monitoring. Background technique [0002] The whole station spatial positioning technology of the substation refers to using only one set of discharge monitoring equipment to complete the monitoring of the partial discharge of the power equipment in the entire substation. At present, the Time of Arrival (TOA) or Time Difference of Arrival (TDOA) method widely used has extremely high high-speed synchronization requirements for the sampling system (GHz sampling frequency and ns-level synchronization accuracy), and the hardware cost Expensive and difficult to apply in the field. Recently, a spatial partial discharge localization method based on UHF signal received signal strength indicator (RSSI) was proposed. At present, RSSI positioning, which has been ...

Claims

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Application Information

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IPC IPC(8): G01R23/12
CPCG01R23/12
Inventor 徐友刚陈敬德沈晓峰马韬韬陆敏安黄晨宏吴继健方祺顾华肖远兵曹基南任堂正黄冠王辉张红燕郑真黄一楠李建宁
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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