Title :
Numerical simulation of Linear frequency modulation signal in Logging while drilling
Author :
Zhu, Ke-Bin ; Nie, Zai-Ping ; Sun, Xiang-yang
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China (UESTC), Chengdu, China
Abstract :
In this paper, the LFM signal as transmitted signal under noisy environment in LWD has been modeled numerically by using NMM and FFT. Based on the frequency spectrum of LFM signal, the NMM and FFT are used to calculate the received signals of receiving coils. Then, matched filter realize pulse compression of the received signals, and the peak signal to noise ratio (PSNR) is improved significantly. Well logging curves are obtained by making use of the amplitude ratio and the phase difference of two receiving coils in the peak point. The simulation results indicate that this method can strongly improve the SNR, especially for the correlated noise which is hardly restrained in single carrier signal.
Keywords :
drilling (geotechnical); geophysical signal processing; well logging; LFM signal frequency spectrum; linear frequency modulation signal; noisy environment; peak signal-to-noise ratio; well logging curves; Bandwidth; Matched filters; Periodic structures; Signal resolution; Signal to noise ratio; White noise; Pulse compression; linear frequency modulation (LFM) signal; logging while drill (LWD); peak signal to noise ratio (PSNR); phase measurement;
Conference_Titel :
Electromagnetics; Applications and Student Innovation (iWEM), 2012 IEEE International Workshop on
Conference_Location :
Chengdu, Sichuan
Print_ISBN :
978-1-4673-3000-8
Electronic_ISBN :
978-1-4673-2998-9
DOI :
10.1109/iWEM.2012.6320377
