AGNINAYAN S PATIL 1AP07EC004 ECE Stealth Technology AGNINAYAN S PATIL 1AP07EC004 ECE

AGENDA Introduction Evolution Characteristics Design process Drawbacks Counter stealth Applications Examples Conclusion

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.

“How to make things invisible” DESIGN PROCESS

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

RCS of metal sphere 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 are Active cancellation Passive cancellation Plasma 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 vehicles Military 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

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

Thank You….