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- Title
基于非均匀采样的模拟退火随钻电磁波电阻率测井检波系统研究.
- Authors
姜明; 柯式镇; 吕世瑶; 李成远; 张文豪
- Abstract
Conventional demodulation systems of LWD electromagnetic resistivity logging use widely uniform sampling, and the measurements are usually processed using digital correlation or the digital phase sensitivity detector(DPSD) method. Consequently, the detection results are affected by the quantization error and the spectrum leakage in the sampling process. In this paper, an simulated annealing(SA) demodulation method based on nonuniform sampling is presented and a rapid detection circuit is designed. The detection results of the proposed method are compared with that of the DPSD methods with uniform sampling, and demonstrate that the former method has a strong frequency-selecting capacity, and the correlation with the quantization errors and the measurement errors brought by the spectrum leakage can both be suppressed effectively. This method is more suitable for demodulation systems of the LWD measurements in extreme environment.
- Subjects
SIMULATED annealing; DEMODULATION equipment; BOREHOLE logging; IRREGULAR sampling (Signal processing); OIL well logging
- Publication
Journal of China University of Petroleum, 2017, Vol 41, Issue 1, p78
- ISSN
1673-5005
- Publication type
Article
- DOI
10.3969/j.issn.1673-5005.2017.01.009