Accession Number : ADA306451

Title :   Analysis of Ionospheric Monitoring System (IMS) Total Electron Content (TEC) Data and Equatorial Phase-Scintillation Data.

Descriptive Note : Scientific rept. no. 1,

Corporate Author : NORTHWEST RESEARCH ASSOCIATES INC BELLEVUE WA

Personal Author(s) : Secan, James A. ; Andreasen, C. C. ; Fremouw, Edward J. ; Holland, Elizabeth ; Mazzella, Andrew

PDF Url : ADA306451

Report Date : 01 JUL 1995

Pagination or Media Count : 52

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 first 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), and (2) a study of the shape and behavior of the phase-scintillation power-density spectrum (PDS) over a scale-size range of 1Os to 1OOs 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 :   *ELECTRON DENSITY, *COMMUNICATION AND RADIO SYSTEMS, *IONOSPHERIC SCINTILLATION, *RADIO WAVES, COMMAND CONTROL COMMUNICATIONS, GLOBAL POSITIONING SYSTEM, COMMAND AND CONTROL SYSTEMS, NAVIGATION SATELLITES, SPECTRAL ENERGY DISTRIBUTION, NOISE REDUCTION.

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE