Accession Number : ADA130431

Title :   The Need for an Expanded Definition of Glistening Surface,

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY

Personal Author(s) : Papa, Robert J ; Lennon, John F ; Taylor, Richard L

PDF Url : ADA130431

Report Date : Oct 1982

Pagination or Media Count : 44

Abstract : The first topic of this report is an analysis of the conditions under which the conventional definition of length of the glistening surface, as given by Beckmann and Spizzichino, is not valid. For a wide range of conditions, significant amounts of incoherent scattered power can be received from areas beyond the conventional length. A second topic is the investigation of the effect on angular tracking accuracy due to such scattering factors as shadowing, surface height distribution, standard deviation in surface height sigma, surface correlation length T, unevenness and inhomogeneity of the terrain, antenna heights, signal frequency and signal polarization. A number of interesting results have been observed. The amount of additional incoherent power not included under the conventional definition depends on the ratio sigma/T, except for the case where both transmitter and receiver are very close to the surface. Next, a Gaussian surface height distribution generally results in less diffuse scattering than an exponential one. The trends seen in the results for scattering from the glistening surface do not differ for horizontal or vertical polarization, for Gaussian or exponential surface height distribution, or for different signal frequencies in the S-band to L-band regions. In an absolute sense, the results for vertical polarization indicate that there would be greater angular tracking accuracy for that case than for horizontal polarization, a result of particular interest for radar applications. (Author)

Descriptors :   *INCOHERENT SCATTERING, *LIGHT SCATTERING, *MULTIPATH RADAR, ANTENNA RADIATION PATTERNS, MULTIPATH TRANSMISSION, PROBABILITY DENSITY FUNCTIONS, RADAR CROSS SECTIONS, SCATTERING CROSS SECTIONS, SURFACE ROUGHNESS, TERRAIN

Subject Categories : Active & Passive Radar Detection & Equipment
      Optics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE