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[1]霍愛清,齊鳳,朱冰.井下接收信號的改進分層閾值降噪方法[J].測井技術,2019,43(01):92-96.[doi:10.16489/j.issn.1004-1338.2019.01.017]
 HUO Aiqing,QI Feng,ZHU Bing.Improved Layered Threshold Wavelet De-noising Method for Downhole Received Signal[J].WELL LOGGING TECHNOLOGY,2019,43(01):92-96.[doi:10.16489/j.issn.1004-1338.2019.01.017]
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井下接收信號的改進分層閾值降噪方法()
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《測井技術》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第43卷
期數:
2019年01期
頁碼:
92-96
欄目:
測井儀器
出版日期:
2019-04-20

文章信息/Info

Title:
Improved Layered Threshold Wavelet De-noising Method for Downhole Received Signal
文章編號:
1004-1338(2019)01-0092-05
作者:
霍愛清 齊鳳 朱冰
(西安石油大學, 陜西 西安 710000)
Author(s):
HUO Aiqing QI Feng ZHU Bing
(Xi'an Shiyou University, Xi'an, Shaanxi 710000, China)
關鍵詞:
井下信號 小波分析 全局閾值 分層閾值 閾值降噪
Keywords:
downhole signal wavelet analysis global threshold layered threshold threshold de-noising
分類號:
P631.84; TN911.72
DOI:
10.16489/j.issn.1004-1338.2019.01.017
文獻標志碼:
A
摘要:
針對旋轉導向鉆井中井下接收信號的噪聲干擾問題,提出一種在分層閾值基礎上改進閾值函數的消噪方法。分層閾值地改進保證了小波系數經閾值作用后的平滑過渡,克服了傳統閾值函數帶來的恒定偏差,同時具有很強的靈活性。選取不同小波進行了多尺度分解與重構實驗,得到Sym6小波基降噪結果最好,失真最小。采用全局閾值、分層閾值和改進分層閾值等不同降噪算法對井下接收信號實現了降噪處理,同時特別研究了小波分解層數對降噪效果的影響,對比分析了降噪后的信噪比、均方根誤差和相關系數。實驗結果表明,采用Sym6小波4層改進的分層閾值法取得了最佳的降噪效果。
Abstract:
In order to solve the problem of noise interference of downhole receiving signal in rotary steerable drilling an improved noise-eliminating method by using threshold function was proposed in this paper on the basis of layered threshold. The improved layered threshold function ensured the smooth transition of the wavelet coefficients after the threshold overcome the constant deviation caused by the traditional threshold function and has a strong flexibility. The multi-scale decomposition and reconstruction experiments of different wavelet were carried out and the results show that Sym6 wavelet basis de-noising has the best effect of noise reduction and the least distortion. In addition the influence of the number of wavelet decomposition layers on the noise reduction effect was also studied in this paper and the signal-to-noise ratio mean square root error and correlation coefficient after noise reduction were compared and analyzed. The experimental results show that the optimal de-noising effect is achieved by using 4 layers of improved layered threshold method of Sym6 wavelet.

參考文獻/References:

奇迹觉醒刷怪最强职业 www.gtarc.icu
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備注/Memo

備注/Memo:
基金項目: 陜西省教育廳重點實驗室科研計劃項目“鉆井工程的VR沉浸場景動態仿真系統研究”(17JS108); 西安石油大學研究生創新基金項目“井下接收信號的小波降噪方法研究”(YCS17212054)
第一作者: 霍愛清,女,1966年生,教授,從事智能導向鉆井控制、井下通信及信號處理研究。E-mail:[email protected]
更新日期/Last Update: 2019-04-20