Post on 05-Jan-2016
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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….