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- W2088976253 abstract "The spatial height distance autocovariance function for the central portion of the visible side of the lunar surface can be approximated by the cosine transform of the lunar return power delay spectrum, and is shown to have an exponential rather than the commonly assumed gaussian form. As many commonly occurring rough terrains also have an exponential autocovariance, it is therefore stated that the lunar surface features are in this sense similar to those of the earth. The experimental lunar echo return is then fitted to the theoretical radar scattering cross section per unit area calculated using exponential autocovariance function, exp (-|r|/B). This is shown to result in one possible set of statistical constants B/L and s/L of 1.0 and 0.1, respectively, for 56 per cent of the central lunar area where s is the standard deviation of heights and L is the wavelength used. The result is statistically interpreted to indicate that the standard deviation, and the average size (along the surface) of the lunar surface irregularities (small scale) may be of the order of 6.82 centimeters, whereas its average slope may be of the order of one in ten, which compares favorably well with the results of the acoustic simulation of moon echoes, and with other results reported so far." @default.
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- W2088976253 date "1964-03-01" @default.
- W2088976253 modified "2023-10-17" @default.
- W2088976253 title "Statistical radar estimate of the lunar surface roughness" @default.
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- W2088976253 doi "https://doi.org/10.1016/0016-0032(64)90477-6" @default.
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