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STEALTH TECHNOLOGY: A REVEALING An investigative study on stealth technology.

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A REVEALING An investigative study on stealth technology. EEE Dept. GEC, Thrissur EEE Dept. GEC, Thrissur What is it? RADAR to detect position of objects. – PowerPoint PPT presentation

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Title: STEALTH TECHNOLOGY: A REVEALING An investigative study on stealth technology.


1
STEALTH TECHNOLOGY A REVEALING An investigative
study on stealth technology.
2
What is it?
  • RADAR to detect position of objects.
  • Counter measures 1. ECM ( e.g. chaff cartridges)
    2. Non ECM
  • Avoiding detection and innovating deception .
  • RCS reductions, acoustics, thermal and other EM
    emissions

3
Examples
  • F 117
  • B-2 Bomber
  • F-22 Raptor( From YF 23 Platform)
  • SR-71 Black bird
  • HMS Helsingborg

4
How is it achieved.
  • Absorbs radar waves or deflects to other
    directions.
  • Minimizes heat and other emissions from engine
    and other spots.
  • Makes difficult to detect except closely.

5
Vehicle shape and structure
  • Smooth edges maximum radio wave reflectors.
  • The size of a target's image on radar is measured
    by RCS (s )
  • For a square flat plate of 1m2 area, s13982 m2
    at 10 Ghz

6
Vehicle structure (contd..)
  • Mainly plan form alignment.
  • The leading edges of wing and tail surfaces set
    at same angles.

7
Vehicle structure (contd..)
  • Use of re-entrant triangles behind skin.
  • Distinctive serrations used in external
    airframes.
  • Propulsion subsystem shaping.
  • Now in research is fluidic nozzles for thrust
    vectoring.

8
Radar Absorbing Materials (RAM)
  • RAMs often as paints used to absorb RADAR
    signals.
  • Iron ball paint, ferrite in polymer matrix used.
  • The cockpit canopy coated with thin layer of
    indium tin oxide .

9
RAMs (contd..)
  • Small cell foams painted or loaded with absorbing
    ink.
  • MAGRAM
  • R- Card
  • Absorbing honeycomb
  • Transparent RAM

10
Other fields
  • Reducing RCS alone not enough.
  • More difficulty is reducing the IR signature.
  • Interest is near IR region. (shorter than 10 µm)

11
IR Emission
  • Major IR emission sources.
  • 1. Tailpipe region
  • 2. Turbojets have EGTs of 1000oC
  • 3. Exhaust gas plume
  • 4. Hot engine parts
  • 5. Aircraft skin (frictional heating)
  • 6. Reflected and reemitted sunlight.

12
IR Reduction
  • Using surface paints
  • Non circular tail pipe
  • Emissions from hot parts screened by airframe.
  • The plume mixed with cool air.

13
IR Reduction (contd)
  • IR best transmitted 2.5, 4 and 10 micron bands.
  • IR outside window absorbed by CO2
  • Passive IR target acquisition systems more used.

14
Electromagnetic emissions
  • EM emissions other than IR .
  • The greatest source is RADAR itself.
  • Shutting down RADAR a solution having negative
    effects.
  • Radio /radar altimeters and Doppler navigation
    systems.

15
EM emissions (contd)
  • Use of inertial navigation , laser or millimetric
    wave system
  • Other EM emissions
  • 1. Radio communication
  • 2. ECM exploited (passive listening)
  • 3. Composite materials radiating switching
    transients
  • Passive sensors (LPI radar in F-22 ), LOS
    communication, inertial navigation are used.

16
Acoustics
  • Most important for submarine ground vehicles.
  • Rubber mountings, AIP system, slow turning
    propellers etc.

Visibility
  • Matte paint, gray paint in disruptive


    schemes , yehudi lights
    ( active camouflage).

17
How to counter.
  • Background of stealth craft than craft shall be
    searched for.
  • High flying aircraft with SLAR, FLIR etc are
    used.
  • Same method advantageously used using satellite.

18
Stealth counter (contd.)
  • Uninterrupted radio waves from stars mapped.
  • Failure or fainter image suggests probability of
    stealthy craft.
  • Advantages of using lethal SAMs and remain
    undetected.
  • Low frequency radar nullifies stealth from shape.

19
Stealth counter (contd.)
  • Disadvantages of LFR
  • 1. Wavelength unavailability
  • 2. Inaccuracy
  • 3. Size
  • 1. Bistatic radars and
  • 2. Using reflections from civilian radio
    transmitters.
  • gives better detection.

20
Conclusion.
  • Stealth technology developed a lot.
  • Investment needed is very high.
  • High chance of low cost gain.
  • A lot learned about signature reduction and
    absorption.
  • Useful for other projects.
  • Success yet to be proved extensively.

21
Thank You.....!
For the time spared
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