Triangle size effect in spaced antenna wind measurements

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Abstract
MF radar ionospheric drift measurements are usually performed by correlating signals from spaced antennas. It has long been noted that the speeds obtained tend to increase to a limiting value when the antenna spacing is increased, and noise was indicated as a likely factor. This paper takes the view that noise is the only significant factor, and, with the help of some simplifying assumptions, shows that elimination of the noise term also eliminates the speed discrepancy on experimental data from two receiving arrays, each with two available spacings.