Analog-to-digital conversion and harmonics due to the angularpositioning error in magnetic field measurement

摘要

Analog-to-digital conversion pertaining to the rotating coil-basedmagnetic field measurement systems requires an angular positioning as asample-timing reference, which inherently introduces unwanted harmonicsdue to the positioning jitter. We have adopted two practical models forthe positioning jitter: a random positioning and a systematicpositioning errors. For each positioning error, we analyzed themagnitude of the harmonics. Further, we have introduced a positioningcorrection scheme to reduce the unwanted harmonics, and analyzed thereduced magnitude to show its significance or the multipole measurementsystem design