PDF
Full
Outline
To address the issue of degraded signal quality in power system fiber optic transformers（FOTs）due to internal and external noise interferences in complex operational environments，a method for enhancing FOT measurement signals under time-frequency domain rotation is proposed.Quantitative calculations for thermal noise，shot noise，vibration noise，and attenuation noise are performed，and an improved wavelet transform is employed for multi-type noise filtering preprocessing.The short-time Fourier transform is combined with an adaptive rotation operator to decompose the signal's time-frequency domain，decoupling and separating the interference components from the effective components，while extracting amplitude-frequency parameters along the frequency axis to enhance the target features.A phase reconstruction algorithm is used to correct the propagation path delays，and the enhanced signal is output.Experimental results show that the harmonic amplitude multiples of the enhanced signal are significantly reduced to 0.06～0.18，far below the baseline value of 0.25 and other comparison methods.The signal amplitude is effectively increased to the range of[-0.5，1.5]V，with a total signal-to-noise ratio of 16.5dB.This method effectively improves the amplitude-frequency characteristic quality and noise resistance of optical fiber mutual inductor measurement signals with low distortion，meeting the precise measurement requirements of power systems，and providing an effective solution for signal processing in complex noise environments.
PDF
73
36
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
