Stealth Technology

AGNINAYAN S PATIL

1AP07EC004

ECE

AGENDAIntroductionEvolutionCharacteristicsDesign processDrawbacksCounter stealthApplicationsExamplesConclusion

WHAT IS STEALTH TECHNOLOGY ?

Stealth is a technique of making an object invisible.

Stealth is an important technology used in military operations.

Stealth is also known as LO(low observable) technology

EVOLUTION

From earliest days deception has been used to gain advantage over the enemy.

Early combat aircraft in WW- I used camouflage to make visual detection difficult.

Advent RADAR in late 1930’s and during WW-II enabled early detection of aircraft .

In 1940’s a unique way with low RADAR cross section strategic bombers developed.

In late 50’s and 60’s came LO planes with compromised performance .

STEALTH CHARACTERISTICS

Airframe shaped for low radar cross section.

Use of radar absorbent materials(RAM).

Minimized infrared signature.

Reduced engine noise.Reduced visual

signature.

DESIGN PROCESS“How to make things invisible”

RADAR CROSS SECTION

RCS of a target is a measure of its size as seen by the radar.

It’s a complex function of the geometric cross section of the target.

RCS is a characteristics of the target not the radar.

RCS of a metal plate

2

224

ba

Large RCS but decreases rapidly as the incident angle deviates from the normal

RCS of metal sphere

2r

Small RCS but independent of the incident angle.

Aircraft high RCS area

Designed low observability areas

Comparative RCS

Radar Absorbing Material(RAM)

Nanostructural composite materials absorbing radar waves without reflecting.

RAM reduces the radar cross section making the object appear smaller.

The other techniques areActive cancellation Passive cancellationPlasma stealth

DRAWBACKS

Poor aerodynamic properties.Requires high end electronic instruments and

software's.High maintenance cost.Limited amount of ordnance.

Counter Stealth Technology

Obtain stronger RADAR returns employing sophisticated algorithm.

VHF and UHF radars

High frequency over the horizon radars(OTHRs).

BI-static and multi-static radar technology.

APPLICATIONS

Used in wind farms.Civil aviation and launch

vehiclesMilitary applications.

LOCKHEED MARTIN F-22A• Wing Span 44.5 ft

• Length 62 ft 1 in

• Wing area 830 sq. ft.

• Top Speed Mach 2+

• Range 800 Nm

• Altitude 65,000 ft

• Air Superiority

• Low Observable

B-2 SPIRIT

Adaptive water curtain technology

CONCLUSION

“The future is bright, the future is stealth….”

Thank You….