Accession Number : AD0530416

Title :   A Review of Satellite Signal Scintillations - Observations and Research.

Descriptive Note : Technical rept.,

Corporate Author : ESL INC SUNNYVALE CALIF

Personal Author(s) : Stevens,Richard K.

Report Date : 16 NOV 1973

Pagination or Media Count : 115

Abstract : Naturally occurring ionospheric irregularities can significantly affect the performance of communication and navigation satellite systems. Both amplitude and phase fluctuations (scintillations) are produced by ionospheric irregularities at heights from 200 to 600 km. Scintillations are most frequently observed on paths traversing the ionosphere at high latitudes and near the geomagnetic equator, although at times they are also observed at mid-latitudes as well. This report summarizes the current state-of-knowledge concerning ionospheric scintillations in the natural environment. Section 2 introduces scintillation effects and discusses the magnitude and the character of the problem. Section 3 introduces the fields of investigation in scintillation research. Section 4 discusses the global occurrence of ionospheric scintillation and its correlation with other measurable geophysical parameters. Section 5 discusses the various models which have been proposed to characterize signal propagation through the disturbed ionospheric environment. Section 6 reviews the theoretical work describing the physical processes leading to inhomogeneities in the ionosphere.

Descriptors :   (*SATELLITE COMMUNICATIONS, VARIATIONS), (*IONOSPHERIC PROPAGATION, SCINTILLATION), (*IONOSPHERIC DISTURBANCES, TRAVELING WAVES), (*NAVIGATION SATELLITES, FADING(ELECTROMAGNETIC WAVES)), ACOUSTIC WAVES, IONOSPHERE, GRAVITY WAVES, ELECTRON DENSITY, PLASMA MEDIUM, MOUNTAINS, OCEANS, POLAR REGIONS, EQUATORIAL REGIONS, DIURNAL VARIATIONS (U) VERY HIGH FREQUENCY, ULTRAHIGH FREQUENCY, SUPERHIGH FREQUENCY

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE