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A NOTE ON SELECTION OF AN ATMOSPHERIC REFRACTIVITY MODEL FOR RADAR RANGE-HEIGHT-ANGLE CHARTS
NAVAL RESEARCH LAB WASHINGTON DC
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Work during the past few years by Bauer et al. of MIT Lincoln Laboratory and Bean and Thayer of the NBS Central Radio Propagation Laboratory CRPL has established the superiority of a negative-exponential model of the atmospheric radio refractivity vs height function, compared to the linearly decreasing refractivity assumed by the well-known 43-earths-radius method, of accounting for ray bending. However, various values of the zero-altitude refractivity and the exponential constant may be used in the exponential model. For many purposes, such as plotting radar coverage on a range-height-chart, a standard assumption for the atmospheric refraction, corresponding to fixed values of these constants, is desirable. Various factors relevant to selection of such a standard are discussed. A chart and table of ray-path range-height values are presented.
APPROVED FOR PUBLIC RELEASE