radar screen - ορισμός. Τι είναι το radar screen
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  3. radar screen

Τι (ποιος) είναι radar screen - ορισμός

VISUAL DISPLAY OF A RADAR SIGNAL
A-display; A-scope; B-scope; J-scope; C-scope; Range Height Indicator; HR-scope
  • An airport surveillance radar display
  • C-scope display. The target is above and to the right of the radar, but the range is not displayed.
  • Chain Home is the canonical A-scope system. This image shows several target "blips" at ranges between 15 and 30 miles from the station. The large blip on the far left is the leftover signal from the radar's own transmitter; targets in this area could not be seen. The signal is inverted to make measurement simpler.
  • The L-scope was basically two A-scopes placed side by side and rotated vertically. By comparing the signal strength from two antennas, the rough direction of the blip could be determined. In this case there are two blips, a large one roughly centred and a smaller one far to the right.
  • Oscilloscope attached to two sine-wave voltage sources, producing a circle pattern on the display.
  • A Beta Scan display.
  • E-scope on the left and B-scope on the right. The E-scope shows two blips at slightly different altitudes, the top one being slightly closer as well. The B-scope shows three blips, the closest being head on, a second just to its right and slightly longer range, and a third near the right edge of the scanning pattern.
  • This image shows a modern PPI display in use, with the islands and ground surrounding the ship in green. The current direction of the radar can be seen as the dotted line pointing northwest.

Radar display         
A radar display is an electronic device to present radar data to the operator. The radar system transmits pulses or continuous waves of electromagnetic radiation, a small portion of which backscatter off targets (intended or otherwise) and return to the radar system.
https://en.wikipedia.org/wiki/Radar_display
radar         
  • 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]]
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
n. early-warning radar
radar         
  • 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]]
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
¦ noun a system for detecting the presence, direction, and speed of aircraft, ships, etc., by sending out pulses of radio waves which are reflected off the object back to the source.
Origin
1940s: from ra(dio) d(etection) a(nd) r(anging).

Βικιπαίδεια

Radar display

A radar display is an electronic device to present radar data to the operator. The radar system transmits pulses or continuous waves of electromagnetic radiation, a small portion of which backscatter off targets (intended or otherwise) and return to the radar system. The receiver converts all received electromagnetic radiation into a continuous electronic analog signal of varying (or oscillating) voltage that can be converted then to a screen display.

Modern systems typically use some sort of raster scan display to produce a map-like image. Early in radar development, however, numerous circumstances made such displays difficult to produce. People ultimately developed several different display types.

https://en.wikipedia.org/wiki/Radar display
Παραδείγματα από το σώμα κειμένου για radar screen
1. He should have "pushed harder to get it onto General Franks‘s radar screen, to get it onto Secretary Rumsfeld‘s radar screen," he said.
2. But Obama was not really on Clinton‘s radar screen.
3. Republicans who could land on his radar screen include Sen.
4. "Katrina arrived, and Niger just disappeared from the radar screen.
5. Saudi Arabia remained on the global diplomatic radar screen.
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