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Telecommunications - An electrical connection to earth through an earth-electrode subsystem. 2. In an electrical circuit, a common return path that usually (a) is connected to an earth-electrode subsystem and (b) is extended throughout a facility via a facility ground system consisting of the signal reference subsystem, the fault protection subsystem, and the lightning protection subsystem. 3. In an electrical circuit, a common return path that (a) may not necessarily be connected to earth and (b) is the zero voltage reference level for the equipment or system.
ATIS - Cite This Source - This Definition - Browse Related Terms: bridged ringing, bridging connection, hunting, leg, Link, off-hook, on-hook
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Telecommunications - The dissipation of rf energy by the earth.
ATIS - Cite This Source - This Definition - Browse Related Terms: Earth, earth ground, equipotential ground plane, ground current, ground loop, ground potential, ground start, ground window, integrated ground plane, isolated ground plane, neutral ground, signal reference subsystem, zone of influence
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Defense - The ground-based sensor and weapon systems of BMD.
DoD Missile Defense Agency - Cite This Source - This Definition - Browse Related Terms: FROG, G/G, GB, GBDL, GBEV, GBLD, GBS, GCI, GEDI, GIP, GLCM, GLP, GLS, GND, SGLS, Tomahawk, UGS
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Defense - Designed to infuse advanced technology and promote competitive environment for GBI.
DoD Missile Defense Agency - Cite This Source - This Definition - Browse Related Terms: ADLT, AIP, AIST, AIT, ARCT, ASTP, AT, ATI, ATIM, ATP, ATV, SMATH
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Defense - A task-able, modular, multi-function, phased-array radar that provides surveillance, tracking and engagement planning data in post-boost, midcourse, and terminal flight phases within its capabilities. It also provides target discrimination, in-flight target updates (IFTUs), and target object maps (TOMs) to interceptor vehicles. See THAAD. (USSPACECOM)
DoD Missile Defense Agency - Cite This Source - This Definition - Browse Related Terms: Battle Space, Layered Defense, LMC, MCG, Midcourse Guidance, SAFEGUARD, Terminal Phase, Terminal Phase Interceptor
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Defense - A fast-response rocket-launched sensor, which can support the SDS midcourse sensor suite by employing multiple Long Wavelength Infrared (LWIR) wavebands and a visible waveband sensor to provide tracking and discrimination of potentially lethal targets. 122
DoD Missile Defense Agency - Cite This Source - This Definition - Browse Related Terms: Boost Surveillance and Tracking System (BSTS), Brilliant Eyes (BE), Brilliant Eyes Probe (BEP), BSTS, Midcourse Space Experiment (MSX), MSTS, SAT, SATKA, SMTS, Space and Missile Tracking System (SMTS), Space-Based Surveillance and Tracking System (SSTS), SSTS, STEP
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Telecommunications - The electrical parameters of earth, such as conductivity, permittivity, and magnetic permeability. Note 1: The values of these parameters vary with the local chemical composition and density of the earth. Note 2: For a propagating electromagnetic wave, such as a surface wave propagating along the surface of the Earth, these parameters vary with frequency and direction.
ATIS - Cite This Source - This Definition - Browse Related Terms: characteristic impedance (Zo), height gain, intermediate-field region, Isotropic, mode, plane wave, refractive index (η, n), transmission coefficient, trapped electromagnetic wave, wave impedance
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Telecommunications - In the presence of an electrical fault, the current that flows in the protective ground wire of a power distribution system.
ATIS - Cite This Source - This Definition - Browse Related Terms: Earth, earth ground, equipotential ground plane, ground absorption, ground loop, ground potential, ground start, ground window, integrated ground plane, isolated ground plane, neutral ground, signal reference subsystem, zone of influence
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Weather - In hydrologic terms, ice that has run aground or is contact with the ground underneath it
NOAA National Weather Service - Cite This Source - This Definition - Browse Related Terms: Arctic sea smoke, Brackish Ice, Brash Ice, Clear Ice, Corn Snow Ice, Deformed Ice, Dendrites, Diffuse Ice, Drifting Ice, Flooded Ice, Hummocked Ice, Ice Age, Ice Boom, Ice Nucleus, Ice Shove, Ice Storm, Icing, Pancake Ice, Pressure Ice, Ridge Ice, Rime Ice, Rotten Ice, RVI, Sea Ice, Severe Icing
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Water - An electrical device designed to protect people (not equipment) from electrical shock. The GFCI is a very sensitive device that can detect ground leakage currents as low as 5 milliamperes. The GFCI can be provided as part of a receptacle or as part of a circuit breaker. When the GFCI detects a ground leakage current, it either deenergizes the receptacle or trips the circuit breaker. Whether the GRCI is part of a receptacle or part of a circuit breaker, it will have a TEST button. Pressing the TEST button will operate the GFCI device and deenergize the circuit. The receptacle will have a RESET button and the circuit breaker is manually reset by hand.
Bureau of Reclamation - Cite This Source - This Definition - Browse Related Terms: Brownout, circuit, Circuit breaker, Circuit mile, Coulomb, Electromotive force (EMF), hertz (Hz), Interlock, Jogging, power factor, Substation, Switching station, Transformer
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Weather - (abbrev. GF) Fog produced over the land by the cooling of the lower atmosphere as it comes in contact with the ground. Also known as radiation fog, and in parts of California as tule fog.
NOAA National Weather Service - Cite This Source - This Definition - Browse Related Terms: Aerosol, Dense Fog Advisory, Evaporation-mixing Fog, Freezing Fog, GF, Ice Fog, Nieve Penitente, Radiation Fog, Rain Induced Fog, Shallow Fog, Steam Fog, Tule Fog, Upslope Fog
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Telecommunications - In an electrical system, an unwanted current that flows in a conductor connecting two points that are nominally at the same potential, i.e., ground, but are actually at different potentials. Note 1: For example, the electrical potential at different points on the surface of the Earth can vary by hundreds of volts, primarily from the influence of the solar wind. Such an occurrence can be hazardous, e.g., to personnel working on long grounded conductors such as metallic telecommunications cable pairs. Note 2: A ground loop can also exist in a floating ground system, i.e., one not connected to an Earth ground, if the conductors that constitute the ground system have a relatively high resistance, or have, flowing through them, high currents that produce a significant voltage ("Iâ¢R") drop. Note 3: Ground loops can be detrimental to the operation of the electrical system.
ATIS - Cite This Source - This Definition - Browse Related Terms: Earth, earth ground, equipotential ground plane, ground absorption, ground current, ground potential, ground start, ground window, integrated ground plane, isolated ground plane, neutral ground, signal reference subsystem, zone of influence