Ads 230 x 230

Monday, May 16, 2011

US NAVY Stealth Technology (Geometry and Water Curtain Technology)

Posted by: , 0 comments





The Sea Shadow, Stealthy Ship Testbed


Geometry Advantage




The Sea Shadow was developed under a combined Navy, Lockheed Martin Missiles and Space Company Program
-

-Sea Shadow, sporting 45º angle Face

Its purpose is to explore a variety of new technologies for surface ships, including ship control, structures, automation for reduced manning, seakeeping and signature control

.
ted, Radar Reflecting/Absorbing, Hull

USS Zumwalt (DD-21)
-

DD(X) Class Stealthy Multimission Destroyer,
-----




Partial List of Anti-Ship Cruise Missiles (ASCM)
USA
AGM-84 Harpoon / Harpoon Block II

France
Exocet AM39 / SM39 / MM40 / BC40
AS 15 TT

India/Russia
Brahmos (PJ10)

Russia
SS-N-27 Klub
SS-N-25 Switchblade
SS-N-22 Sunburn
SS-N-19 Shipwreck

China
C-701

Germany
AS.34 Kormoran 1/2

EU
Polyphem

Norway
Penguin
NSM

Britain
Sea Skua

Sweden
RBS 15 Mk3

Italy
Otomat Mk2

Israel
Gabriel III

.


The Adaptive Water Curtain Technology (AWCT) is intended to deflect and scatter enemy radar waves thus reducing the ship’s radar cross section (RCS). It consists of highly conductive sea water sprayed in a fashion that effectively creates an angled radar reflective curtain around the ship

To reduce the ship’s remaining RCS, the water curtain can be "modulated" such that the returns appear as "Sea Clutter." This could be done by determining the surrounding Sea State--either locally, or from satellite Sea State data, i.e., deriving the Sea Clutter Spectrum; and applying the appropriate coefficients to the modulating process for optimum mimicry

This technology can reduce a surface ship's vulerability to Radar cross-section (RCS), Infrared signature (IR), and Visual signature reduction.

.
-Water Curtain Modulation-
Nozzle Control for 'Sea State' Mimicry

To reduce the ship’s remaining RCS, the water curtain can be "modulated" such that the returns appear as "Sea Clutter." This is done by determining the surrounding Sea State--either locally, or from satellite Sea State data, i.e., deriving the Sea Clutter Spectrum and applying the appropriate coefficients to the modulating process for optimum mimicry


Active Water Curtain Technology AWCT

The Adaptive Water Curtain Technology (AWCT) is intended to deflect and scatter enemy radar waves thus reducing the ship’s radar cross section (RCS). It consists of highly conductive sea water sprayed in a fashion that effectively creates an angled radar reflective curtain around the ship.

Water, especially sea water, is highly electrically conductive and if the water droplets are compact enough, RADAR waves will be reflected just as if the surface were metal. Also, streams of sea water will absorb as well scatter radar energy.

The system is adaptive, that is, it monitors each ‘water stream landing zone,’ and by adjusting the appropriate nozzle/monitor/pump combination (including azimuth, elevation, water pressure, spread, modulation, pulsing, etc.), compensates for wind speed and direction - loading

Active Windowing,
Rapid Modulation of Pump Nozzles-

Creating Dynamic Openings in the Water Curtain
Useful when synchronized with Radar and other Sensors.

-
Radar Evasion by Shaped Water Curtain-

----------Full Water Curtain----------------------------Stepped/Folded (Fresnel lens)
Arleigh Burke DDG-51 using some Shaped Water Curtains-

Active Water Curtain Technology-

Array of Powerful Water Pump outlets creating Water Curtain


Illustration of Sea Clutter overlaid by Detection Threshold-

Targets Detected above the Clutter
Linear Nozzle Array-

-Omnidirectional Nozzle Array-
.
Linear Nozzle Array
Array shown with one section in up, or operational, position.
The external "central feeder pipe" is an indication of the "add on" nature of the AWCT.
.
End View Diagram
Array shown with one section in up, or operational, position.



===============+++======+++===========


Slideshow

 
صفحات مبعــثرة كسرت حاجز الصمـت لتحكي
متعة الحياة أن تعمل عملا لم يسبقك إليه أحد ولم يتوقعه الآخرون.................. Its just another way to unlock ur potential representing my internists with other. By sniffing the web u might see several info.,instructions and details. here i collect similar and simplify them to u, cutting out from my time, efforts even i create my unique posts