Arithmetic versus geometric mean of target radar cross section

✍ Scribed by John S. Seybold; Kirk L. Weeks

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 503 KB
• Volume: 11
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19960405)11:5<265::aid-mop9>3.0.co;2-c

✦ Synopsis

This article proiides a discussion of the relationship between the geometric und arithmetic mean of a target radar cross section (RCS). A plot of /he expected difference between the geometric and arithmetic means of data sets from a log-normal probability densiy function (pdf) ijersus the standard deuiation of the data set is presented. This is folluwed by results jirom a subset of actual test data, which indicate that, for a T-72 (Russian tunk) measured at 35 GHz, the difference between these two computations may be less thun I dB. A larger data set of seileral different types of ground uehicles is then used to test the robustness of the transformation. These data showed a wider oariation between the two means, and the result ofthe transfornation shows deriations 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 derii'ation of the transformation between the two different means, when the data are log-nomal distributed and the standard deviation is known, is provided.