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| Weak signal processing technology of low frequency GPR based on Hilbert-Huang transform and its application to permafrost area gas hydrate exploration |
| BAI Da-Wei1, 2, 3, DU Bing-Rui1, 2, 3, ZHANG Peng-Hui1, 2, 3 |
1. Eelectromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources, Langfang 065000, China;
2.National Modern Geological Exploration Technology Research Center, Langfang 065000, China;
3. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China |
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Abstract As the low frequency ground penetrating radar acquisition time window is large, the influence of signal attenuation and dispersion on deep strata is very obvious, the real reflection signals are often accompanied by a lot of noise, and hence the low frequency GPR signal can be regarded as the typical non-stationary signal. The authors used the Hilbert-Huang transform method, which is very effective in non-steady signal processing, to study the weak signal processing method. This means can effectively filter the abrupt change part and noise in the signal, so as to detect and extract the deep weak signal. Using this method to explore the gas hydrate in permafrost zone, the authors successfully extracted the effective reflection signal of low frequency ground penetrating radar signals at the bottom of permafrost and its natural gas hydrate reservoir, thus obtaining good results.
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Received: 08 September 2017
Published: 20 December 2017
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