吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (6): 2128-2136.doi: 10.13229/j.cnki.jdxbgxb201606050

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Improved quadrature detection algorithm for controlled source electromagnetic detection

ZHOU Feng-dao1, 2, WANG Shuang1, HAN Si-yu1, XU Fei1, LIAN Shi-bo1, SUN Cai-tang1, 2   

  1. 1.College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China;
    2.National Geophysical Exploration Equipment Engineering Research Center, Changchun 130061, China
  • Received:2015-06-10 Online:2016-11-20 Published:2016-11-20

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Abstract: To overcome the deficiency of traditional quadrature detection algorithm in amplitude and phase extraction of controlled source electromagnetic detection with square-wave excitation source, an improved detection algorithm is proposed. The implementation process of the improved quadrature detection algorithm is analyzed, and the earth medium influence with high-pass properties is discussed. According to these characteristics, the matching low-pass filter and low sampling rate method are designed to ensure the detection precision of the improved algorithm. Experimental results indicate that the amplitude error of the improved algorithm is 0.01% ~ 0.72% compared with the sinusoidal-wave referenced quadrature detection, and the phase error is within 4°. The detection precision is improved at least one order of magnitude compared with the square-wave referenced quadrature detection algorithm. The improved detection algorithm is multiplication-free, in high real-time property, and is of low hardware requirement. Meanwhile, it can restrain the earth medium influence with high-pass properties. So the improved algorithm has good application prospect in controlled source electromagnetic detection.

Key words: information processing technology, controlled source electromagnetic detection, improved quadrature detection algorithm, earth medium with high-pass properties, low sampling rate

CLC Number: 

  • TH763
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