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

fYear

2012

fDate

6-9 Aug. 2012

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/iWEM.2012.6320377

Filename

6320377