Position Correction on Large Near-Field Scanners Using an Optical Tracking System
Author: Greg Hindman
Large scanners used for near-field antenna measurements require careful attention to the design and fabrication process to maintain probe position accuracy1. This paper discusses the design, implementation, and results of a novel optical probe position tracking system used by NSI on a number of large near-field scanners. This system provides measurement of the probe X, Y and Z position errors, and real-time on-the-fly position correction. The use of this correction can significantly enhance measurement accuracy, and can reduce the cost of building large near-field scanners.