secondary radar - Definition. Was ist secondary radar
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Was (wer) ist secondary radar - definition

TYPE OF RADAR SYSTEM USED IN AIR TRAFFIC CONTROL
Secondary radar; Secondary Surveillance Radar; Monopulse SSR
  • Secondary surveillance radar antenna ''(flat rectangle, top)''  mounted on an ASR-9 primary airport surveillance radar antenna ''(curved rectangle, bottom)''.
  • Original SSR antenna providing a narrow horizontal beam and a wide vertical beam
  • Regions of weak signal due to ground reflection
  • Independent secondary surveillance radar (ISSR), designation YMT, north of Chibougamau, Quebec, Canada
  • Mode A and C interrogation format
  • Mode A and C reply format
  • Mode A/C/S All-Call interrogation
  • Mode S interrogation, short and long
  • Mode S reply, short and long
  • SSR antenna of [[Deutsche Flugsicherung]] at Neubrandenburg, in Mecklenburg/Western Pomerania
  • Sum and Control antenna beams
  • Antenna main beam with difference beam
  • Transponder in a private aircraft squawking 2000
  • Comparison of the vertical beam shapes of the old and new antennas

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).
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
(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

Secondary surveillance radar

Secondary surveillance radar (SSR) is a radar system used in air traffic control (ATC), that unlike primary radar systems that measure the bearing and distance of targets using the detected reflections of radio signals, relies on targets equipped with a radar transponder, that reply to each interrogation signal by transmitting encoded data such as an identity code, the aircraft's altitude and further information depending on its chosen mode. SSR is based on the military identification friend or foe (IFF) technology originally developed during World War II, therefore the two systems are still compatible. Monopulse secondary surveillance radar (MSSR), Mode S, TCAS and ADS-B are similar modern methods of secondary surveillance.