Russian vs Western Stealth Technology

Babloo Singh

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Unless you have Vympel R-37 or Novator K-100
I believe it doesn't matter... neither the aircraft firing it not the missile can track beyond 200 KMs... only thing is the AWACS needs to shut it's radar and run :biggrin2:
 

asianobserve

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No. The latest anti-stealth radars are VHF/UHF radars which are generally working between 30MHz to 3000MHz. As today's stealth technology is working best against center meter radar wave, its RCS will be downgrade significantly. However, comparing to those X or S radars, VHF/UHF have a terrible precise problem which is not good enough to guide missile to attack. In some research, the deviation could be as large as 100 meters. So the way that VHF/UHF radar works is to detect stealth plane earlier, provide more early warning time for own stealth plane.
As I mentioned above, the Americans actually already commissioned years ago a true anti-stealth AWACS in the form of E-2D Advance Hawkeye. E-2D uses Lockheed Martin's APY-9 UHF radar coupled to massive computing power to be able to lock on to targets beyond 555kms.

In fact, E-2D radar has already been tested in one of the longest over the horizon successful engagement of a target using SM-6 missile.

http://nationalinterest.org/blog/th...le-just-broke-important-military-record-17907

How the E-2D hybrid radar works:

HYBRID APPROACH

The hybrid design approach for the E-2D radar perhaps typifies how Northrop matched the technology available at contract signing in 2002 and the needs of the mission.

Although mechanically scanned arrays are growing obsolete, technology does not yet exist for a UHF-band (300MHz to 1GHz) electronically scanned array (UESA) to fit within the size and weight limits aboard the Hawkeye airframe. At the time Northrop launched the programme, it was reported that a UESA system would require 27 transmit modules to achieve 360e_SDgr coverage.

Northrop has installed a combination of radar systems in a variable speed rotodome. There is a mechanically scanned L-3 Communications Randtron ADS-18 antenna that sweeps in 360e_SDgr for all radio frequency emissions. In addition, the 18-channel Lockheed Martin APY-9 electronically scanned array scans for airborne objects across an arc up to 90e_SDgr wide.

The rotodome is designed to spin at three different speeds, completing a full revolution either every 10s, 12s or 15s. The crew also has the option to stop the rotodome. This allows the radar to focus all the energy provided by the E-2D's twin 170kVa generators, which can each surge to 225kVa for up to 3h, into a targeted area. Concentrating the beam allows the radar to either find smaller targets closer-in, or pick up larger targets at far greater ranges.

It is this unique combination of mechanical and electronic scanning that allows the E-2D to more than double the range of the previous APS-145 radar on the E-2C. Neither Northrop nor navy officials disclose the range of the APY-9, but it is listed as beyond 300nm (555km) and appears only constrained by the distance to the horizon at the E-2D's mission altitude of 25,000ft.

Complementing the more capable transmitter, Northrop also added digital, low-noise receivers to improve the sensitivity of a more diverse set of radar targets. With more power, a more capable transmitter and digital receivers, the E-2D would need a far more capable back-end processor to filter through a huge increase in signal noise or clutter.

"As you increase the power, [radar] clutter goes up as much as targets," says Culmo, adding the overland mission is a particular challenge. "If you don't do something to cancel the clutter better, you get nothing from increasing the [radar system's] power."
https://www.flightglobal.com/news/a...may-not-look-pretty-but-packs-big-new-344539/
Northrop Grumman and Lockheed Martin appear to have overcome the traditional limitations of UHF-band radars in the APY-9 by applying a combination of advanced electronic scanning capability together with enormous digital computing power in the form of space/time adaptive processing.

The Navy would not directly address the issue, but service officials did say the APY-9 provides a massive increase in performance over the E-2C Hawkeye 2000’s radar.

“The E-2D APY-9 radar provides a significantly enhanced airborne early warning and situational awareness capability against all air targets including threat aircraft and cruise missiles,” said Naval Air Systems Command spokesman Rob Koon in an emailed statement to USNI News.
https://news.usni.org/2014/06/09/u-s-navys-secret-counter-stealth-weapon-hiding-plain-sight
Under the NIFC-CA ‘From the Air’ (FTA) construct, the APY-9 radar can act as a sensor to cue Raytheon AIM-120 AMRAAM air-to-air missiles for Boeing F/A-18E/F Super Hornets fighters via the Link-16 datalink.

Additionally, the APY-9 also acts as a sensor to guide Standard SM-6 missiles launched from Aegis cruisers and destroyers against targets located beyond the ships’ SPY-1 radars’ horizon via the Cooperative Engagement Capability datalink under the NIFC-CA ‘From the Sea’ (FTS) construct. And thus far, all live-fire NIFC-CA missile shots have been successful.
 

pmaitra

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Can AWACS with long wavelength radar help????

They can obviously lock on and guide missiles to the stealthy target.

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Long wavelength radars cannot provide enough precision to guide missiles.
My understanding is that long wavelength scatters less and therefore should be able to offer better precision over short wavelength. Why would long wavelength not provide enough precision?
 

asianobserve

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What is the Space-Time Adoptive Processing (STAP) used in E2-D:

This is a technique that uses algorithms to isolate clutter and either intentional (jamming) or unintentional interference. The algorithms separate moving targets from static noise, allowing the radar to "see" clearly even amid dense clutter and high power levels.
 

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