RADAR - translation to arabic
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RADAR - translation to arabic

OBJECT DETECTION SYSTEM BASED ON RADIO WAVES
Radio detection and ranging; Airport radar; Radars; RADAR; Radio detecting and ranging; Radar illumination; Radio Detection and Ranging; Radar Homing and Warning; Radar station; Coherent processing interval; Radar system; Microwave radar; Fill pulse; Radar equation; Centimetric radar; Coherent Processing Interval; Radar distance measurement; Radar communication; Air search radar; Radar systems; Remote Radar Head; Applications of radar; Palmer Scan; Radar signal processing; Derax; Radar antenna design
  • 3D Doppler radar spectrum showing a [[Barker code]] of 13
  • A [[Chain Home]] tower in Great Baddow, Essex, United Kingdom
  • Change of [[wavelength]] caused by motion of the source
  • Experimental radar antenna, US [[Naval Research Laboratory]], Anacostia, D. C., from the late 1930s (photo taken in 1945)
  • AS-3263/SPS-49(V) antenna (US Navy)
  • echoes]] from a target cause ghosts to appear.
  • [[Phased array]]: Not all radar antennas must rotate to scan the sky.
  • Pulse-Doppler signal processing. The ''Range Sample'' axis represents individual samples taken in between each transmit pulse. The ''Range Interval'' axis represents each successive transmit pulse interval during which samples are taken. The Fast Fourier Transform process converts time-domain samples into frequency domain spectra. This is sometimes called the ''bed of nails''.
  • Echo heights above ground<br /><math>H=\left (\sqrt{r^{2}+(k_{e}a_{e})^{2}+2rk_{e}a_{e}sin(\theta _{e})} \right )-k_{e}a_{e}+h_{a}</math> <br />Where : <br />&nbsp;&nbsp;r : distance radar-target <br />ke : 4/3 <br />ae : Earth radius <br />θe : elevation angle above the radar horizon <br />ha : height of the feedhorn above ground
  • Slotted waveguide antenna
  • Radar components
  • Pulse radar: The round-trip time for the radar pulse to get to the target and return is measured. The distance is proportional to this time.
  • Commercial marine radar antenna. The rotating antenna radiates a vertical fan-shaped beam.
  • Surveillance radar antenna
  • Continuous wave (CW) radar. Using frequency modulation allows range to be extracted.
  • The first workable unit built by [[Robert Watson-Watt]] and his team
  • Memorial plaque commemorating Robert Watson-Watt and [[Arnold Wilkins]]

radar         
N
الرادار
radar         
اسْم : الرادار . جهاز لتحديد وجود شيء أو موقعه بواسطة أصداء الموجات اللاسلكية
RADARS         

ألاسم

رادار

Definition

radar
(radars)
Radar is a way of discovering the position or speed of objects such as aircraft or ships when they cannot be seen, by using radio signals.
N-VAR: oft N n

Wikipedia

Radar

Radar is a radiolocation system that uses radio waves to determine the distance (ranging), angle (azimuth), and radial velocity of objects relative to the site. It is used to detect and track aircraft, ships, spacecraft, guided missiles, and motor vehicles, and map weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radio waves (pulsed or continuous) from the transmitter reflect off the objects and return to the receiver, giving information about the objects' locations and speeds.

Radar was developed secretly for military use by several countries in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution. The term RADAR was coined in 1940 by the United States Navy as an acronym for radio detection and ranging. The term radar has since entered English and other languages as a common noun, losing all capitalization.

The modern uses of radar are highly diverse, including air and terrestrial traffic control, radar astronomy, air-defense systems, anti-missile systems, marine radars to locate landmarks and other ships, aircraft anti-collision systems, ocean surveillance systems, outer space surveillance and rendezvous systems, meteorological precipitation monitoring, altimetry and flight control systems, guided missile target locating systems, self-driving cars, and ground-penetrating radar for geological observations. Modern high tech radar systems use digital signal processing and machine learning and are capable of extracting useful information from very high noise levels.

Other systems similar to radar make use of other parts of the electromagnetic spectrum. One example is lidar, which uses predominantly infrared light from lasers rather than radio waves. With the emergence of driver-less vehicles, radar is expected to assist the automated platform to monitor its environment, thus preventing unwanted incidents.

Examples of use of RADAR
1. Navy Aegis BMD ship with SPY–1 radar; the Upgraded Early Warning Radar at Beale Air Force Base, Calif.; and the Sea–Based X–band radar.
2. CloudSat‘s Cloud–Profiling Radar is more than 1,000 times more sensitive than typical weather radar.
3. Anti–radar activists say the radar will make the Czech Republic a target and undermine its security.
4. Georgia said radar data proved Russian jets violated its airspace Monday and fired a missile aimed at a Georgian radar.
5. Bangalore, December 20: India has developed a surveillance central acquisition radar and is also working on a weapon locating radar, officials of electronics and radar development establishment (LRDE) and Bharat Electronics Limited (BEL) said today.