DITHER IN DIGITAL CORRELATION MEASUREMENTS

J. Lal-Jadziak

Abstract

An analysis of estimation errors of correlation measurements due to A/D conversion with a dither signal has been carried out. It has been shown that any random signal satisfying appropriate conditions can be used as dither. Gaussian noise, although not satisfying one of these conditions, may influence the improvement in the accuracy of digital measurement. It is also easier to generate than dither with rectangular or triangular envelope probability density function (PDF), and, moreover, it may occur in a system in a form of intrinsic noise described by the term 'self-dither'.<BR />Because the signal mean square value can be expressed by means of an autocorrelation function, the analysis carried out is also valid for the use in this important measurement.

Keywords

correlation measurement methods, A/D conversion with dither, normalized bias error

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IMEKO-WC-2000-UNC-P509.pdf

DOI

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