title: Manchester code telemetry system for well logging using quasi-parallel inductive-capacitive resonance.
abstract: In this paper, a quasi-parallel inductive-capacitive (LC) resonance method is proposed to improve the recovery of MIL-STD-1553 Manchester code with several frequency components from attenuated, distorted, and drifted signal for data telemetry in well logging, and corresponding telemetry system is developed. Required resonant frequency and quality factor are derived, and the quasi-parallel LC resonant circuit is established at the receiving end of the logging cable to suppress the low-pass filtering effect caused by the distributed capacitance of the cable and provide balanced pass for all the three frequency components of the Manchester code. The performance of the method for various encoding frequencies and cable lengths at different bit energy to noise density ratios (Eb/No) have been evaluated in the simulation. A 5 km single-core cable used in on-site well logging and various encoding frequencies were employed to verify the proposed telemetry system in the experiment. Results obtained demonstrate that the telemetry system is feasible and effective to improve the code recovery in terms of anti-attenuation, anti-distortion, and anti-drift performances, decrease the bit error rate, and increase the reachable transmission rate and distance greatly.
authors.affiliation: Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrument Science and Opto-electronic Engineering, Beihang University, Beijing 100191, China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Xu
authors.affiliation: Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrument Science and Opto-electronic Engineering, Beihang University, Beijing 100191, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Chen
authors.affiliation: Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrument Science and Opto-electronic Engineering, Beihang University, Beijing 100191, China.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Cao
authors.affiliation: Production Logging Institute, Daqing Logging and Testing Services Company, Daqing 163453, China.
authors.forename: Xingbin
authors.initials: X
authors.lastname: Liu
authors.affiliation: Production Logging Institute, Daqing Logging and Testing Services Company, Daqing 163453, China.
authors.forename: Jinhai
authors.initials: J
authors.lastname: Hu