Propagation considerations for emerging satellite communications applications

Article Abstract:

The effects of rain and other propagation concerns for new satellite communications applications are examined. Among these areas are very small aperture terminal (VSAT) systems using low operating margins and/or low elevation angles, traditional communications applications operating with inclined geosynchronous orbits, and mobile and personal communications applications using networks of low earth orbit (LEO) satellites. All of these applications rely on small communications terminals with inherent small link margins; the performance of these terminals will be affected by atmospheric propagation impairments much more than larger, higher-margin systems. Rain attenuation will remain a problem, but cloud attenuation, scintillation, and gaseous attenuation will also be greater potential impairments. The operational parameters of low-margin, low-elevation-angle, inclined geosynchronous, and LEO systems are studied.

Industrial research, Earth stations, Satellite communications, Telecommunications, Technical, Research and Development, Performance Measurement, Communications Technology, Scientific Research, Signal Attenuation, Signal Propagation, Very Small Aperture Terminals

---

Ray-mode analysis of complex resonances of an open cavity

Article Abstract:

A generalized wavefront-resonance, partial-resonance method undergoes a modal expansion to enable the association of partial, internal high-Q frequencies with waveguide modes to enable the parameterization of the global scattering behavior of objects whose shape is an arbitrary-length enclosure with one open end and parallel, thin walls. A hybrid form of ray-mode coupling is used to construct a global resonance equation, the solution of which generates the resonant frequencies for the complex, composite object. Global resonances are affected by different components of the object, so the frequencies can be analyzed to obtain structural information about the object. Development, underlying equations, and application of the ray-mode analysis technique are described.

Algorithms, Algorithm, Tomography, Electromagnetic radiation, Object Recognition, Data Analysis, Scene Analysis, technical

---

Similar abstracts:

• Abstracts: The quasiparticle view of wave propagation. Propagation considerations in satellite communication systems
• Abstracts: Time generation and distribution. Survey of telecommunications applications of quantum electronics -- progress with optical fiber communications
• Abstracts: Propagation research in Europe using the OLYMPUS satellite. Ray methods for modal fields in general closed and open propagation environments

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.