- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
The propagation of radio waves by scattering as a result of irregularities or discontinuities in the physical properties of the troposphere. 2. A method of transhorizon communications using frequencies from approximately 350 MHz to approximately 8400 MHz. Note: The propagation mechanism is still not fully understood, though it includes several distinguishable but changeable mechanisms such as propagation by means of random reflections and scattering from irregularities in the dielectric gradient density of the troposphere, smooth-Earth diffraction, and diffraction over isolated obstacles (knife-edge diffraction. ) Synonym troposcatter.
Industry:Telecommunications
The propagation of radio waves by scattering as a result of irregularities or discontinuities in the ionization of the ionosphere. Synonym forward propagation ionospheric scatter.
Industry:Telecommunications
The propagation of radio waves by scattering as a result of irregularities or discontinuities in the ionization of the ionosphere. Synonym forward propagation ionospheric scatter.
Industry:Telecommunications
The production of oscillation in a circuit or device by impressing a stimulus (signal) for a period that is extremely short compared to the duration of the oscillation that it produces. Synonym shock excitation.
Industry:Telecommunications
The propagation distance from a coherent source to a point where an electromagnetic wave maintains a specified degree of coherence. Note 1: In long-distance transmission systems, the coherence length may be reduced by propagation factors such as dispersion, scattering, and diffraction. Note 2: In optical communications, the coherence length, L, is given approximately by L = 2/ (n,) where is the central wavelength of the source, n is the refractive index of the medium, and is the spectral width of the source. Note 3: Coherence length is usually applied to the optical regime.
Industry:Telecommunications
The progressive linking and testing of system components to merge their functional and technical characteristics into a comprehensive, interoperable system. Note: Integration of data systems allows data existing on disparate systems to be shared or accessed across functional or system boundaries.
Industry:Telecommunications
The progressive diminution with time of certain quantities characteristic of a phenomenon. 2. The progressive decay with time in the amplitude of the free oscillations in a circuit. 3. Energy dissipation mechanisms that reduce the amplification and broaden the vibratory response in the region of a resonance.
Industry:Telecommunications
The production, in a nonlinear element of a system, of frequencies corresponding to the sum and difference frequencies of the fundamentals and harmonics thereof that are transmitted through the element.
Industry:Telecommunications
The production, as a result of the absorption of photons, of a voltage difference across a pn junction. Note: The voltage difference is caused by the internal drift of holes and electrons.
Industry:Telecommunications
