Accession Number : ADA264156


Title :   An Investigation of Methods for Improving Models of Ionospheric Plasma- Density Irregularities and Radio-Frequency Scintillation


Descriptive Note : Technical rept.,


Corporate Author : NORTHWEST RESEARCH ASSOCIATES INC BELLEVUE WA


Personal Author(s) : Secan, James A ; Bussey, Robert M ; Fremouw, Edward J ; Reinleitner, Lee A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264156.pdf


Report Date : 01 Mar 1993


Pagination or Media Count : 58


Abstract : Many modern military systems used for communications, command and control, navigation, and surveillance depend on reliable and relatively noise- free transmission of radiowave signals through the earth's ionosphere. Small- scale irregularities in the ionospheric density can cause severe distortion, known as radiowave scintillation, of both the amplitude and phase of these signals. The WBMOD computer program can be used to estimate these effects on a wide range of systems. The objective of this study is to investigate improvements to the WBMOD model based on extensive data sets covering both the equatorial and high-latitude regimes. This report summarizes the work completed during the first year, which includes construction of the modeling database, development of a new format for the internal representation of the irregularity strength, and development of new models for the diurnal, latitudinal, seasonal, and longitudinal variations in the equatorial region.... Ionosphere, Ionospheric scintillation, Radiowave scintillation.


Descriptors :   *COMMUNICATION AND RADIO SYSTEMS , *IONOSPHERIC SCINTILLATION , *RADIO WAVES , COMPUTER PROGRAMS , DATA BASES , COMMAND CONTROL COMMUNICATIONS , EQUATORIAL REGIONS , IONOSPHERE , AMPLITUDE , DISTORTION , LATITUDE , SCINTILLATION , ATMOSPHERIC DENSITY , ATMOSPHERE MODELS , RADIO INTERFERENCE , RADIOFREQUENCY , SURVEILLANCE , HIGH LATITUDES , RADIO SIGNALS , NOISE , DENSITY , MODELS , PLASMAS(PHYSICS) , NAVIGATION


Subject Categories : Atmospheric Physics
      Radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE