Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 7    July 2021

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Energy distribution and effective components analysis of 2n sequence pseudo-random signal
Yang YANG1, Ji-shan HE2,3, Di-quan LI3

1. Geotechnical and Structural Engineering Research Center, Shandong University, Ji’nan 250061, China;
2. Institute of Urban Underground Space and Energy Studies, Chinese University of Hongkong, Shenzhen 518172, China;
3. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

Abstract:In order to extract usable harmonics from real 2n sequence pseudo-random data, a technical method is proposed. An equation for predicting the average amplitude of the main frequencies is proposed to guide the choice of signal type for different exploration tasks. By the threshold of the amplitude of the transmitted signal, a set of candidate frequencies are first selected. Then, by operating a spectrum envelope method at these candidate frequencies on received data, effective components in data are extracted. A frequency density calculation method is proposed based on a logical number summation method, to reasonably characterize the frequency density in different frequency bands. By applying this method to real data in Sichuan, China, with signal Type 13, 75 effective components are extracted, including both main frequencies and harmonics. The result suggests that the number of effective frequencies in the 2n sequence pseudo-random signal can be increased by extracting usable harmonics, without any additional fieldwork.

 

Key words: electromagnetic prospecting; 2n pseudo-random signal; energy conservation; harmonic extraction; frequency density

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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