Advanced System Summary and Modern MWD Developments - Measurement While Drilling Signal Analysis, Optimization and Design - page 291

10.2 MWD Signal Processing Research in China
MWD research in China is active, openly pursued and published. Because
the program is key to the country's national agenda, it is well funded. These
factors provide an atmosphere conducive to and fostering innovation and,
importantly, supporting the training of engineers and researchers capable of
improving and extending old and new ideas. In the lead author's opinion, the
enthusiasm with which these efforts is pursued is unmatched anywhere else.
The record is clear: a significant body of original research, pursued by both
government and national oil companies, exists, focusing on modern MWD
issues in signal processing, hardware design and environment characterization.
And it is growing rapidly. In the “screen shots” presented below, we have
captured representative research, all available publicly, reflecting a diversity of
work related to topics in this topic, e.g., wind tunnel simulation, phase-shift-
keying, adaptive filtering, reflection deconvolution, echo removal, turbine
design, torque and so on. Copies of these papers are available from the authors.
Figure 10.2.1. Signal processing, PSK methods (CNPC).