Just explain mean what is LPI in reality? Not just the definition but how it work in reality! LOL

Just a book for begineers in ECM

Courtesy from US navy.

 

Page  5-8.3 :

 

In addition to agile frequency and PRI parameters, the future threat will be composed of a number of high-PRF
pulsed Doppler, burst-frequency, CW, pulse-compression, agile-beam, and LPI radars, which use pseudo-noise waveforms.
This conglomeration of radar types will cause a high signal density which must be segmented into a manageable data stream
by the use of both frequency and spatial filtering in the RWR. While frequency and PRI are good parameters for sorting
present-day non-agile emitters, they are poor or useless parameters for sorting agile emitters.
Angle of arrival is generally regarded as the best initial sorting parameter because it cannot be varied by the emitter from pulse to pulse.

See Page 5-8.5 :
 

Search LPI in

And you will see that several system are able to discriminate LPI radars and all are ESM measurement system with interferometric detectors to cancell spatial ambiguity.

Whatever US, french, israelis, Swedish ...

Now you insult me also because you are a stupid american redneck with no brain between hears and without a decent engineering degree to understand.

The more I stay here and the more I see dumbass instead of people with decent brain and ability to discuss and who have really work in engineering field.

I could post dozen of technical links, even from the DoD, you would not read it and understand them.

Angle of arrival is generally regarded as the best initial sorting parameter because it cannot be varied by the emitter from pulse to pulse.

Indeed

Phase interferometer DF systems are utilized when accurate angle-of-arrival information is required.

 

Here a example of a US patent:

 

BACKGROUND OF THE INVENTION

Various reconnaissance systems are used to intercept radar signals and decipher some of their critical characteristics and angles of arrival. A microwave intercept receiver may be used for just this purpose. In particular reconnaissance applications in areas such as Electronic Warfare (EW) the receiver is designed to fulfill roles such as radar warning, electronic support measures (ESM), and Electronic Intelligence (ELINT). In most conventional approaches, the intercept receiver is designed to perform two functions The first function is to measure the signal characteristics of the intercepted signal, and the second is to determine its angle of arrival (AOA) for the purpose of direction finding (DF) and location of the radar source.

With the proliferation of radar systems and the increasing number of radars employing complex waveform modulation, it is difficult to differentiate and sort the intercepted radar signals using just the coarse conventional parameters. Typically these coarse parameters include AOA, carrier frequency, pulse width (PW), pulse repetition interval (PRI), and scan pattern. Since many radars have similar conventional parameters, ambiguity may occur in both the sorting and identification processes.

One type of receiver that may be used to precisely measure the conventional parameters as well as the intrapulse modulation for both sorting and identification purposes is the intrapulse receiver.

However, the use of Low Probability of Intercept (LPI) radars with low peak power has introduced a further requirement for modem intercept receivers, requiring them to have a much higher sensitivity in order to detect these LPI radar signals. Until recently, almost all radars were designed to transmit short duration pulses with a high peak power. This type of signal is easy to detect using relatively simple, traditional EW intercept receivers making the attacker (radar source) vulnerable to either antiradiation missiles or Electronic Counter Measures (ECM). However, by using LPI techniques it is possible to design a LPI radar that is effective against traditional EW intercept receivers. One of the most important LPI techniques is the use of phase or frequency waveform coding to provide transmitting duty cycles approaching one. This technique can result in drastic reductions in peak transmitted power while maintai

   Thats a Terrible thing to say about a man - if word like that got round work may start to take me seriously

LOL, behold the power of Google.

 

If you think only those five airplanes have RF interferometers, you need to google some more ;)

 

And if you think a tactical aircraft sized platform can single ship geolocate fast enough to not only detect an LPI signal but then modulate it for deception and retrotransmit it in real time, all before you show up on the other guy's scope, you paid too much for your PhD.  You can eventually figure out something saw you, and you may eventually figure out what it is if the profile it's showing is in your library, and you may be able to do something about it if the range is right.  But you will not make yourself invisible to it.

 

For the "3D numeric stealth" thing, if that's all you meant, then it's another case of you finding out about a capability and mistaking it for something unique.  But I guess it's good you learned something in the process.

 

Like I said, Spectra is a nice system that tries to give the aircrew the most SA it can about surface to air threats so that you can see them before they can kill you.  And it's got a nice modern jammer.  It couples real nicely with the French tendency to fly super low and fast to hit point targets.  But you're all kinds of confused if you think that makes it anything out of the ordinary in air to air, or makes it able to fly around care free in a SAM threat environment.

One five five echo

But you will not make yourself invisible to it.