Accession Number : ADA266314


Title :   A Ray Trace Model for Propagation Loss


Descriptive Note : Final rept.


Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA


Personal Author(s) : Hattan, C P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266314.pdf


Report Date : Feb 1993


Pagination or Media Count : 65


Abstract : This study was conducted to determine the feasibility of replacing the optical-region propagation model currently assessing the effect of lower atmosphere refraction on electromagnetic (EM) system performance within the Engineer's Refractive Effects Prediction System (EREPS) with a complete ray trace model. The ray trace model uses a full ray trace solution to describe the propagation environment. It is implemented in a Microsoft QuickBASIC program intended for IBM-compatible personal computers. The ray trace model can determine propagation loss under certain conditions, but it resolves ray paths with increasing difficulty when the EM system frequency rises, and it produces large divergence factors. Since attempts to eliminate fluctuations in the ray trace divergence factors have failed, the study's results argue that the ray trace model is not suitable for EREPS.


Descriptors :   *OPTICAL PROPERTIES , *RAY TRACING , *TRANSMISSION LOSS , *ATMOSPHERIC REFRACTION , COMPUTER PROGRAMS , MODELS , PATHS , WAVE PROPAGATION , ELECTROMAGNETIC WAVE REFLECTIONS , RECEIVERS , TRANSMITTERS , LOSSES , EVAPORATION


Subject Categories : Atmospheric Physics
      Optics
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE