Calculation of errors in certain UHF measurements

1968 ◽  
Vol 11 (7) ◽  
pp. 902-905 ◽  
Author(s):  
A. I. Mekhannikov
Keyword(s):  
Uhf Measurements

Tristatic EISCAT-UHF measurements of the HF modified ionosphere for low background electron temperatures

1995 ◽  
Vol 100 (A6) ◽  
pp. 9717 ◽  
Author(s):  
A. Westman ◽  
T. B. Leyser ◽  
G. Wannberg ◽  
M. T. Rietveld
Keyword(s):  
Low Background ◽  
Uhf Measurements

Uhf measurements in functional-state diagnosis for human skin

1983 ◽  
Vol 17 (2) ◽  
pp. 53-55
Author(s):  
G. M. Buvin ◽  
Yu. V. Berlin ◽  
�. Z. Rabinovich ◽  
M. D. Usacheva ◽  
O. A. Yurina
Keyword(s):  
Human Skin ◽  
Functional State ◽  
State Diagnosis ◽  
Uhf Measurements

The Use of Concentric-Line Transformers in UHF Measurements

1955 ◽  
Vol PGI-4 (0) ◽  
pp. 91-101
Author(s):  
W. A. Harris ◽  
J. J. Thompson
Keyword(s):  
Uhf Measurements

Ultrawidebandwidth measurements of foliage transmission properties at UHF - Measurements system and results

1992 ◽  
Author(s):  
Dan R. Sheen ◽  
D. W. Kletzli, Jr. ◽  
N. P. Malinas ◽  
Terry B. Lewis ◽  
Juan F. Roman
Keyword(s):  
Transmission Properties ◽  
Uhf Measurements

scholarly journals Improving the Error of Time Differences of Arrival on Partial Discharges Measurement in Gas-Insulated Switchgear

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4078 ◽  
Author(s):  
Jun Jiang ◽  
Kai Wang ◽  
Chaohai Zhang ◽  
Min Chen ◽  
Hong Zheng ◽  
...  
Keyword(s):  
Fault Location ◽  
Cross Correlation ◽  
Minimum Energy ◽  
Threshold Value ◽  
Partial Discharges ◽  
Time Difference ◽  
Gas Insulated Switchgear ◽  
Minimum Energy Method ◽  
Precise Time ◽  
Uhf Measurements

Partial Discharge (PD) detection based on Ultra-High-Frequency (UHF) measurements in Gas-Insulated Switchgear (GIS) is often used for fault location based on extraction of Time Differences of Arrival (TDoA), and the core technique is to obtain the precise time difference of each UHF signal. Usually, TDoA extraction algorithms can be categorized as cross-correlation function method (CCF), minimum energy method (ME), and threshold value method (TV) are not qualified to analyze the time difference with high accuracy and efficiency, especially the complicated UHF PD signals in the field. In this paper, multiple tests were carried out based on the real GIS UHF signals. Three typical algorithms (CCF, ME, and TV) were used to extract and calculate the TDoA of UHF signals. Afterwards, depending on the disassembly of equipment, the accuracy and effective range of the algorithms are analyzed by means of error and variance. To minimize the error and the variance, an average method with the combination (CA) and portfolio of traditional algorithms is proposed and verified in different situations. The results demonstrate that the improved algorithm could increase the accuracy of time difference extraction, less than 4.0%.

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