Accession Number : AD0286300

Title :   RESEARCH STUDIES RELATED TO MAPPING, GEODESY AND POSITION DETERMINATION

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

Personal Author(s) : BROWN,R.S. ; GRAVITT,J.C.

Report Date : 19 DEC 1961

Pagination or Media Count : 1

Abstract : The study of tropospheric wave propagation is concerned with (a) reliability of estimates of accuracy of the distance in geodetic measurements where corrections are made from a knowledge of only end-point atmospheric refractive index values, and (b) solutions of the one-dimensional wave equation for wave propagation in a medium with periodic permittivity variations. The statistical character of the atmospheric refractive index is discussed and estimates of the accuracy of distance correction factors derived. The wave equation for tropospheric wave propagation is compared with Mathieu's equation and solutions derived in terms of both series and Floquet-form solutions. The effect of atmospheric turbulence on the angular deviations and velocity fluctuations of an optical beam are described. These studies are used as a basis for the design of a laboratory experiment to study the accuracy of the theory in predicting angular and velocity fluctuations of a light beam in geodetic position measurements. An experiment is described for determining the feasibility of more effective utilization of end-point refractive index parameters in geodetic distance measurements and correction procedures. (Author)

Descriptors :   *GEODESICS, *MAPPING, CORRECTIONS, DIFFERENCE EQUATIONS, ELECTROMAGNETIC WAVE REFLECTIONS, IONOSPHERIC PROPAGATION, REFRACTIVE INDEX, WAVE PROPAGATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE