Some Studies in Filtering of Atmospheric Turbulence.
Abstract
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 Hanning. 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 Hanning 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. Keywords include: Crossing Frequency; Filter; Atmospheric Turbulence; Spectral Density Function.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA154042
Entities
People
- C. K. Lee
Organizations
- Naval Postgraduate School