RADAR DISPLAY A, B, F-SCOPE DISPLAY

 A   SCOPE  DISPLAY

 

 

 

 

 

                                     FIG. A SCOPE DISPLAY

It is a popular display.

A-scope Display is the deflection modulation type display system.

It identifies the range of the target. A scope display operation is similar to that of an ordinary CRO.

Linear sawtooth voltage is applied to the horizontal deflection plates in synchronism with the transmitted pulse. Hence, the beam is produced to scan the CRT screen horizontally.

The demodulated echo signal is obtained from the receiver & the demodulated echo signal is applied to the vertical deflection plate to cause vertical deflection from the horizontal line.

If the echo signal is absent then Display is a simple horizontal line.

1st blips due to transmitted pulse.

In addition to this blips are corresponding to:

1. GROUND CLUTTER:

Echos signal from a various fixed object near Transmitter & from the ground.

1. Grass noise.

Constant Amplitude & continuous receiver noise.

3. Actual  target

The distance of the blips from the reference blip gives the range of the corresponding target. 

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ADVANTAGE

1. Gain control for vertical deflection can be provided, which allow sensitivity to be increase for weak signal & reducing for strong ones. In the case of a strong echos signal, reducing the Amplitude of grass noise.

LIMITATION & APPLICATION

1.Distance of the target can determine & not it's direction as an antenna direction can be determined 

 

 B SCOPE DISPLAY

 

 

 FIG. B - SCOPE DISPLAY

 It is a modulated Display.

The horizontal axis represents the azimuth angle & the vertical axis represents display.

If two targets are at a constant cross range, they become visible at different separations at different ranges.

F - SCOPE DISPLAY

                                                

                                                      

                                     FIG. F- SCOPE DISPLAY 

 It is a rectangular display.

The vertical axis represents the elevation angle & the axis represents the azimuth angle. The target becomes visible as a centralized blip when the antenna looks at the target.