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Demodulation of acoustic telemetry binary phase shift keying signal based on high-order Duffing system |
| Bing-Nan Yan(燕并男)1,2, Chong-Xin Liu(刘崇新)1, Jun-Kang Ni(倪骏康)1, Liang Zhao(赵亮)3 |
1 School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2 College of Electrical Engineering，School of Xi'an Shiyou University, Xi'an 710065, China;
3 Xi'an Thermal Power Research Institute Co. Ltd, Block A, Boyuan Science & Technology Building, Xi'an 710054, China |
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Abstract In order to grasp the downhole situation immediately, logging while drilling (LWD) technology is adopted. One of the LWD technologies, called acoustic telemetry, can be successfully applied to modern drilling. It is critical for acoustic telemetry technology that the signal is successfully transmitted to the ground. In this paper, binary phase shift keying (BPSK) is used to modulate carrier waves for the transmission and a new BPSK demodulation scheme based on Duffing chaos is investigated. Firstly, a high-order system is given in order to enhance the signal detection capability and it is realized through building a virtual circuit using an electronic workbench (EWB). Secondly, a new BPSK demodulation scheme is proposed based on the intermittent chaos phenomena of the new Duffing system. Finally, a system variable crossing zero-point equidistance method is proposed to obtain the phase difference between the system and the BPSK signal. Then it is determined that the digital signal transmitted from the bottom of the well is ‘0’ or ‘1’. The simulation results show that the demodulation method is feasible.
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Received: 11 April 2016
Revised: 16 June 2016
Accepted manuscript online:
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PACS:
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05.45.-a
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(Nonlinear dynamics and chaos)
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05.40.-a
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(Fluctuation phenomena, random processes, noise, and Brownian motion)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51177117) and the National Key Science & Technology Special Projects, China (Grant No. 2011ZX05021-005). |
Corresponding Authors:
Bing-Nan Yan
E-mail: bnyan@xsyu.edu.cn
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Cite this article:
Bing-Nan Yan(燕并男), Chong-Xin Liu(刘崇新), Jun-Kang Ni(倪骏康), Liang Zhao(赵亮) Demodulation of acoustic telemetry binary phase shift keying signal based on high-order Duffing system 2016 Chin. Phys. B 25 100502
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