Accession Number:

ADA278568

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.

Report Date:

1993-11-01

Pagination or Media Count:

56.0

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 earths 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 second year, which include completion of the new models for the equatorial region and initial development of for the high latitude auroral and polar cap region. Ionosphere, Ionospheric density irregularities, Equatorial region radiowave scintillation, Modelling.

Descriptors:

• *RADIO SIGNALS
• *RADIO TRANSMISSION
• *IONOSPHERIC SCINTILLATION
• *RADIO WAVES
• COMPUTER PROGRAMS
• EQUATORIAL REGIONS
• GEOMAGNETISM
• IONOSPHERE
• DENSITY
• MODELS
• NAVIGATION
• SIGNALS
• NOISE
• AMPLITUDE
• DISTORTION
• HIGH LATITUDES
• POLAR CAP
• SURVEILLANCE
• RADIOFREQUENCY
• SCINTILLATION
• LATITUDE

Subject Categories:

• Radiofrequency Wave Propagation
• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE