| The Segmented Waveguide Program for Long Wavelength Propagation Calculations |
APR 87 |
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| Authors:
J. A. Ferguson; F. P. Snyder; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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 | A computer which obtains waveguide mode solutions for very low frequencies and low frequencies (VLF/LF) is described. The program allows for multiple homogeneous segments to be specified, allowing for consideration of variations in the earth-ionosphere waveguide. Path geometry and geophysical parameters can be computed by the program. Ionospheric disturbances due to man- made or naturally events can also be modeled using the program. Keywords include: Longwave propagation, Wavelength mode, and ... |
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| Longwave Propagation - A Brief Review |
JUN 86 |
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| Authors:
F. P. Snyder; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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| This brief review of the state-of-knowledge of longwave electromagnetic propagation in the near-earth environment includes some discussions of commonly available computer models for this frequency regime. The frequency range considered in this report encompasses the ELF, the VLF, and the lower part of the LF band. Because longwave propagation is characterized by high stability in both amplitude and phase, and because these frequencies propagate to very great distances, longwave signals ... |
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| A Radar Sea Clutter Model for Atmospheric Ducting Conditions |
31 JUL 1984 |
41 pages |
| Authors:
F. P. Snyder; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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 | The Integrated Refractive Effects Prediction System (IREPS) should consider sea clutter effects under atmospheric ducting conditions. The IREPS, undergoing research and development at Naval Ocean Systems Center (NOSC), is intended to provide a shipboard environmental data processing and display capability to assess refractive effects of the lower atmosphere for naval EM systems. Although intended to be incorporated eventually as a part of the Tactical Environment Support System (TESS), the IREPS ... |
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| SUBFLR - An Algorithm for Calculating Surface-Based FLIR Detection Ranges |
25 JAN 1983 |
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| Authors:
H. G. Hughes; M. R. Paulson; F. P. Snyder; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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| A model is described for assessing the effects of scattering and absorption of infrared radiation by atmospheric aerosols and gases on the ranges at which surface targets can be detected against their natural backgrounds by a surface-based FLIR system. The equations from the model are implemented via a computer program which calculates detection range. |
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| Approximate VLF/LF Waveguide Mode Conversion Model. Computer Applications: FASTMC and BUMP. |
18 NOV 1980 |
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| Authors:
J. A. Ferguson; F. P. Snyder; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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| This document reviews vlf radio propagation theory, discusses transequatorial vlf propagation at night and during day-night transitions, and presents a vlf propagation model that includes consideration of inhomogeneities both in the vertical direction and along the propagation path. The model considers anisotropic effects (caused by the geomagnetic field). It is implemented into a FORTRAN computer program called FASTMC. This program allows for an arbitrarily oriented and elevated transmitting dipole antenna ... |
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