Some studies in filtering of atmospheric turbulence.
Lee, Cheong Koo
Healey, James V.
Bell, Richard W.
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This study/ assuming stationary Gaussian turbulence model, investigates the effect on the crossing frequency of different spectral functions: von Karman, Kaimal and Teunissen for the x and z directions with five filters: ideal band-pass, ideal low-pass, "quadratic-type", "sine-type" and the Banning. The filters have a much greater effect than the spectral functions. The estimated crossing frequency variation is as much as 50 percent among the quadratic-type, low-pass and sine-type filters. The Banning filtering predicts crossing^ rates up to thirty times, and the ideal one decade wide band-pass filtering predicts rates of eight times, higher than the ideal low-pass filtering. The variation, between the x and z direction, is less than 10 percent for the von Karman spectrum, and over 40 percent for the Teunissen one.
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