2002 Technical Papers

An Expanded Approach to Spherical Near-Field Uncertainty Analysis

Author: Doren W. Hess
Publication: AMTA 2002
Copyright Owner: NSI-MI Technologies

We at MI Technologies have employed the Hansen error analysis developed at the Technical University of Denmark (TUD), as a starting point for new system layouts. Here I expand it in two ways: the approach to mechanical errors, and the approach to system design.

I offer an alternative approach to the analysis of mechanical uncertainties. This alternative approach is based upon an earlier treatment of spherical coordinate positioning analysis for far-field ranges. The result is an appropriate extension of the TUD uncertainty analysis.

Also, the TUD error analysis restricts its attention to three categories of errors: mechanical inaccuracies and receiver inaccuracies and truncation effects. An error analysis for a spherical measurement system should desirably contain entries equivalent to the 18-term NIST table for planar near-field. In this paper, I offer such an extended tabulation for spherical measurements.



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