Radar Displays 2013

8/13/2019 Radar Displays 2013

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4. Displays

4.1 Cathode Ray Tubes4.2 Types of display4.3 Modern displays

Displays


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Displays

Displays are used to present in visual form the information contained in theradar echo signal, i.e. in a form suitable for operator interpretation andaction.

When the display is connected directly to the video output of the receiver,the information displayed is known as raw video. When the receiver videooutput is rst processed by Automatic Detection and Tracking (ADT)processing, the output is sometimes known as synthetic video.

Until recently displays were almost universally based on the cathode raytube (CRT), with long-persistence phosphor screens. These usually had tobe operated in a darkened room. There are still many of these in use.

There are several different types of display, according to the type of radarand scan employed..


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A-scope

C.R.O.

echo amplitude

time or range

The time-basedrive is very simple

The A scope was used for the earliest types of radar. It consists of adeection-modulated display, with vertical deection proportional to echostrength and horizontal coordinate proportional to range.


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Radar A Scope Display


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B-scope

range

- + bearing

Amplitude formsintensity orz-modulation

Raster time-basein the verticaldirection

Intensity-modulated rectangular display, with azimuth angle (bearing)indicated by horizontal coordinate and range by vertical coordinate.


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Radar B Scope Display

Range mark

Azimuth mark

Targets

Clutter


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Plan Position Indicator (PPI)

! R

amplitude is usedfor intensity orz-modulation

range is measured radiallyoutwards; bearing is thesame as the direction ofantenna look

Intensity-modulated circular display in which echoes are displayed in polarformat .


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IEEE Std 686-2008:


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Naval radar display


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Range Height Indicator (RHI)

altitude

range

elevation angle

amplitude - z-modulation

slant range(given by ct /2)

Intensity-modulated display with height (altitude) as the vertical axis andrange as the horizontal axis.


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Modern displays

A modern radar display is essentially the same as a computer display - so youcan do whatever you want !

different types of display

use color

add coastlines, ightcorridors

add alphanumericinformation for height, trackstatus, etc

BA03930,000'500kts


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Raymarine MarineBband Radar Display


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ATC workstation display

5nm Leader line

Different plot symbol denoting

10nm and 5nm separationminima.

History trails

Call sign

Flight

Level

Departure point

Flight PlanManipulation icons

Adaptable information FieldCurrently showing Climbrate


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ATC workstation display

Example ofconict alertdisplay (6,500 # apart vertically )

Radar Displays 2013

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