Radar System and the Stealth Technology......Amit Kumar A72 G4001

8/2/2019 Radar System and the Stealth Technology......Amit Kumar A72 G4001

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RADAR

ITS HISTORY

PRINCIPLES

STEALTH TECHNOLOGYRCS- RADAR CROSS SECTION

MINIMIZING RCS

DISADVANTAGES AND FUTURE


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RADAR

RADAR (Radio Detection And Ranging) is a way todetect far off targets by transmitting a radio pulse in thedirection of the target and observing the reflection of thewave.


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HISTORICAL OVERVIEW

1865 :-The Scottish physicist James Clerk Maxwell developed hiselectro-magnetic light theory (Description of the electro-magnetic waves and her propagation)1940 :-Different radar equipment are developed in the USA,Russia, Germany, France and Japan.


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PRIMARY RADAR SET


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PRINCIPLES OF RADARECHO

1. Echo can be considered

as a wave bouncing offthe surface and coming

back to source.

2. This principle can beused to detect distance

of target .

DOPPLER SHIFT

1. This is second principle of

radar.

2. This can be used to detect the

speed of target approaching.


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DETERMINING RANGE WITHPULSE RADAR

c = 3 x 108m/sec

t is time to receive return

divide by 2 because pulse traveled to object and back

2

*tcRange


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DOPPLER SHIFT It is used to calculate

the velocity of detected

objects.


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DOPPLER FREQUENCYSHIFTS

Motion Away:

Echo Frequency Decreases

Motion Towards:

Echo Frequency Increases


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WHAT DO WE MEAN BY

STEALTH ?

STEALTH TECHNOLOGY


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RADAR CROSS SECTION(RCS)

O Radar Cross Section Is A

Measure Of How DetectableAn Object Is With A Radar.

O A Larger RCS Indicates That

An Object Is More EasilyDetected.


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RAS- RADAR ABSORBENT SURFACE

RAM- RADAR ABSORBENT MATERIAL


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MINIMIZING R.C.S.

GEOMETRIC DESIGN :1. Conventional aircraft use

round shape cone

2. The stealth aircraft is made up

of flat surface and very sharp

edges3. Radar signal heating the

stealth plane are scattered in

all directions by this.

RAS- RADAR ABSORBENT SURFACE


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MINIMIZING R.C.S.

RADAR ABSORBING MATERIAL:1. Metallic surfaces generally reflect the

radar signals.

2. There stealth aircraft should be coated

with radar absorbent materials.

3. Which deflect and absorbed incoming

radar waves and reduce the detectionrange.


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PLASMA STEALTH

Act ive s t ea l th t e chno logyAir c ra f t in j e c t s a p la sma inf r ont o f the a i r c r a f tI t c ove r s en t i r e body o f thef i ght e rAbsorb mos t o f thee l e c t r omagne t i c en e r gy o f

rada r waveExampl e : - MiG-35 ( supe rfu l c rum/ rapto r k i l l e r )


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AVOIDING IR SIGNATURE

Its like flying a plane with no engineDepends on the engine and where the engine

is placed in an aircraft

By placing engines deep into the fuselage


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VISUAL STEALTH

Low visibility is desirable for all military applications. Earlier stealth aircraft were painted black and thus

could be used during nights.

Now days an electro chromic polymer is beingdeveloped for daytime stealth.

These polymer sheets sense nature of the surrounding

and change there color accordingly.


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VISUAL STEALTH


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Stealth aircraft cannot fly as fast as conventional aircraft

Can carry limited amount of load

Providing missiles with RAM and RAS is an impossible by

the cost of these things.

Expensive B-2 cost [ $2 billion ] ,F-22 [$100 million ]

DISADVANTAGES OF STEALTH


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FUTURE OF STEALTH TECHNOLOGY Future of air combat.

Be incorporated in fighters and bombers but also in

ships, helicopters, tanks and transport planes.

In due course of time we can see many improvements in

the field of military aviation which would one-day even

make stealth technology obsolete


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Name: Amit KumarSec: G4001

Roll: A72

Reg.- 11011486

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Radar System and the Stealth Technology......Amit Kumar A72 G4001