- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
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.
Radiant power incident per unit area upon a surface. Note: Irradiance is usually expressed in watts per square meter, but may also be expressed in joules per square meter. Deprecated synonym power density.
Industry:Telecommunications
Radiant power per unit solid angle, usually expressed in watts per steradian.
Industry:Telecommunications
Radiant power, in a given direction, per unit solid angle per unit of projected area of the source, as viewed from the given direction. Note: Radiance is usually expressed in watts per steradian per square meter.
Industry:Telecommunications
Radiation emitted when the internal energy of a quantum mechanical system drops from an excited level to a lower level without regard to the simultaneous presence of similar radiation. Note: Examples of spontaneous emission include radiation from an LED, and radiation from an injection laser below the lasing threshold.
Industry:Telecommunications
Radiation made up of oscillating electric and magnetic fields and propagated with the speed of light. Includes gamma radiation, X-rays, ultraviolet, visible, and infrared radiation, and radar and radio waves.
Industry:Telecommunications
Radiation that is incident upon a material and produces secondary emission from the material.
Industry:Telecommunications
Radiation, at the same or different wavelengths, i.e., frequencies, of energy received from an incident wave. 2. Undesirable radiation of signals locally generated in a radio receiver. Note: Radiation might cause interference or reveal the location of the device.
Industry:Telecommunications
Radio communication using a reception technique in which a resultant signal is obtained by combining signals (a) that originate from two or more independent sources that have been modulated with identical information-bearing signals and (b) that may vary in their transmission characteristics at any given instant. Note 1: Diversity transmission and reception are used to obtain reliability and signal improvement by overcoming the effects of fading, outages, and circuit failures. Note 2: When using diversity transmission and reception, the amount of received signal improvement depends on the independence of the fading characteristics of the signal as well as circuit outages and failures.
Industry:Telecommunications
Radio interference caused by the impact of charged particles against an antenna. Note: Precipitation static may occur in a receiver during certain weather conditions, such as snowstorms, hailstorms, rainstorms, dust storms, or combinations thereof.
Industry:Telecommunications
Radio noise caused by natural atmospheric processes, primarily lightning discharges in thunderstorms.
Industry:Telecommunications
