Accession Number : AD0422333

Title :   A METHOD FOR PREDICTING APPARENT ELEVATION ANGLE FOR A TROPOSPHERIC TARGET FROM SPECIFIED VALUES OF GEOMETRICAL ELEVATION ANGLE AND HEIGHTF

Corporate Author : ARMY ELECTRONICS RESEARCH AND DEVELOPMENT ACTIVITY WHITE SANDS MISSILE RANGE N MEX

Personal Author(s) : Milnarich,Paul ,Jr.

Report Date : OCT 1963

Pagination or Media Count : 12

Abstract : A method is presented for calculating the apparent elevation angle to be expected for a tropospheric target for specified values of geometrical elevation angle and height. Assumptions are made that the troposphere is horizontally homogeneous and that the index of refraction decreases monotonically with height above a spherical earth. The method, which was devised as a tool for tracking system error analysis, allows for a direct prediction of apparent elevation angle for a given target position and for a direct application of the ray-tracing formula for computing the corresponding radio range. (Author)

Descriptors :   (*ATMOSPHERIC REFRACTION, TROPOSPHERE), (*RADIO WAVES, PROPAGATION), MATHEMATICAL MODELS, ANGLE OF ARRIVAL, REFRACTIVE INDEX, GEOMETRY, INEQUALITIES, RADAR TARGETS, OPTICAL TRACKING

Distribution Statement : APPROVED FOR PUBLIC RELEASE