Abstract
This article provides a discussion of the relationship between the geometric and arithmetic mean of a target radar cross section (RCS). A plot of the expected difference between the geometric and arithmetic means of data sets from a log-normal probability density function (pdf) versus the standard deviation of the data set is presented. This is followed by results from a subset of actual test data, which indicate that, for a T-72 (Russian tank) measured at 35 GHz, the difference between these two computations may be less than 1 dB. A larger data set of several different types of ground vehicles is then used to test the robustness of the transformation. These data showed a wider variation between the two means, and the result of the transformation shows deviations as large as 2 dB, suggesting that transformation of the means for data that are not truly log-normal can induce noticeable errors. A complete derivation of the transformation between the two different means, when the data are log-normal distributed and the standard deviation is known, is provided. © 1996 John Wiley & Sons, Inc.
Published Version
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