Accession Number : ADA325078

Title :   Observation, Analysis, and Modeling of Ionospheric Total Electron Content (TEC) and Scintillation Effects.

Descriptive Note : Scientific rept. no. 2,

Corporate Author : NORTHWEST RESEARCH ASSOCIATES INC BELLEVUE WA

Personal Author(s) : Andreasen, C. C. ; Mazzella, Andrew ; Fremouw, Edward J. ; Rao, G.S. ; Holland, Elizabeth

PDF Url : ADA325078

Report Date : JUL 1996

Pagination or Media Count : 64

Abstract : Many military systems used for communications, command and control, navigation, tracking, and surveillance depend on reliable and relatively noise free transmission of radiowave signals through the earth's ionosphere. These systems can be affected by both large scale features (> 1,000 km) and small scale structures (<few hundred km) in the ionosphere, often leading to degraded operations. This report documents the results of the second year of a three year investigation of various facets of this problem. Two study areas are reported on: (1) an investigation of methods for using signals from Global Positioning System (GPS) satellites to measure ionospheric Total Electron Content (TEC), including techniques for receiver calibrations, and (2) a study of the shape and behavior of the phase scintillation power density spectrum (PDS) over a scale size range of 10s to 100s of kilometers. The TEC studies are still on going; the phase PDS study found that the slope of the phase PDS at these scale sizes is steeper than those found in earlier studies at shorter scales.

Descriptors :   *GLOBAL POSITIONING SYSTEM, *ARTIFICIAL SATELLITES, *RADIO TRANSMISSION, *RADIO WAVES, *SCINTILLATION, IONOSPHERE, SHAPE, ELECTRONS, NAVIGATION, RECEIVERS, COMMAND AND CONTROL SYSTEMS, NOISE(SOUND).

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE