Computer Science – Performance
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa22b..02g&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA22B-02
Computer Science
Performance
[2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities, [7900] Space Weather
Scientific paper
The electron density in the earth’s upper atmosphere is typically horizontally stratified and relatively uniform; however, a number of processes can cause structuring of the electron gas. While the physical mechanisms of the processes and instabilities involved in such events vary significantly, they produce relatively predictable effects on the propagation of electromagnetic waves determined by the scale sizes, amplitudes and geometries of the resulting density gradients and irregularities. These effects frequently cause undesirable impacts on modern space-based radio frequency systems, the extent of which depend on the specific design and function of a given system. Communication systems, for example, are affected primarily by fluctuations in signal amplitude associated with ionospheric scintillations caused by density irregularities of 1-km and smaller scale sizes, while GPS receivers, sensitive to both phase and amplitude variations, may exhibit degraded performance from both large-scale and small-scale gradients. Beginning with the physical environment, this talk will consider a number of known system effects and consider their significance in terms of overall impact to service and anticipated frequency of occurrence, as well as potential impact mitigation strategies that may include improved system design and/or better specification and forecasting of the space environment. The combination of all these factors determines the vulnerability of a given system to spatial variations in ionospheric density.
Basu Sarbani
Carrano Charles S.
Caton R. G.
Groves Keith M.
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