Zooming Functional Method for Position Measurement in Enclosing Signal Field.

概要

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This paper describes a methodology for obtaining a higher precision for a position measurement in an enclosed signal field by introducing the concept of a zooming functional measurement. First, the way of thinking from a measurement equation to the zooming functional measurement was shown. This shows that there exists the effect of reducing the accidental errors in the case of intentionally changing the sensitivity but not changing the amount of noise in the active sensing system such as an enclosed signal field. Next, this method was applied to the position measurement by the enclosed signal field. New variable parameters that included both initial phases and brightness ratios were considered in the conventional lighting functions. The proper adjusting of these parameters makes it possible to get a desired sensitivity at intended positions. By using this operation, the zooming functional two-dimensional position measurement could be performed. Finally, these effects were experimentally confirmed by a measurement system with four linear LED arrays and a photo sensor. In the experiments, the setting sensitivity was changed from 1 to 16, and the results showed that the standard deviation at sensitivity 8 was 1/5 of that for 1. This fact revealed that the accidental error was reduced by this zooming function.
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