For Radar we have terms and definitions in 8 topics. The topics are Climatology, Explosives, Ham Radio, Hunting, Nautical, Satellite Meteorology, Technology and Weather.

Radar (Climatology)

Acronym for RAdio Detection And Ranging; a radio device or system for locating an object by means of ultrahigh-frequency radio waves reflected from the object and received, observed, and analyzed by the receiving part of the device in such a way that characteristics (as distance and direction) of the object may be determined

Radar (Explosives)

Radar (radio detection and ranging), system or technique for detecting the position, motion, and nature of a remote object by means of radio waves reflected from its surface. Radar systems transmit pulses of electromagnetic waves by means of directional Antennas; some of the pulses are reflected by objects in the path of the beam. Reflections are received by the radar unit, processed electronically, and converted into images on a Cathode-Ray Tube. The distance of the object from the radar source is determined by measuring the time required for the radar signal to reach the target and return. The direction of the object with respect to the radar unit is determined from the direction in which the pulses were transmitted. In most units, the beam of pulses is continuously rotated at a constant speed, or it is scanned (swung back and forth) over a sector at a constant rate. The velocity of the object is sometimes determined by the Doppler Effect: if the object is approaching the radar unit, the frequency of the returned signal is greater than the frequency of the transmitted signal; if the object is receding, the returned frequency is less; and if the object is not moving relative to the radar unit, the frequency of the returned signal is the same as the frequency of the transmitted signal. Most radar units operate on microwave frequencies.

Radar (Ham Radio)

Radio detection and ranging.

Radar (Hunting)

An instrument for determining the distance and direction to an object by measuring the time needed for radio signals to travel from the instrument to the object and back, and by measuring the angle through which the instrument’s antenna has traveled.

Radar (Nautical)

An electronic instrument that uses radio waves to find the distance and location of other objects. Used to avoid collisions, particularly in times of poor visibility.

Radar (Satellite Meteorology)

An instrument used for detecting the presence and distance of objects, such as rain drops, by scattering radio energy.

Radar (Technology)

an acronym for "radio detection and ranging." ; usually operates in the ultra-high-frequency (UHF) or microwave part of the radio-frequency (RF) spectrum, and is used to detect the position and/or movement of objects

Radar (Weather)

Acronym for RAdio Detection And Ranging. An electronic instrument used to detect distant objects and measure their range by how they scatter or reflect radio energy. Precipitation and clouds are detected by measuring the strength of the electromagnetic signal reflected back. Related terms: Doppler radar and NEXRAD: View WALTER Radar Tutorial

Similar

Browse words that start with:

• Ra
• Rad
• Radar

Browse All Terms by First Letter

Term Search