I am sure that the F-35 to JAS rear comment was in thermal, not RF.

No surprise there as the F135 is HUGE 😉

Excellence can be obtained if you:
…care more than others think is wise;
…risk more than others think is safe;
…dream more than others think is practical;
…expect more than others think is possible.

Howard Schultz
Starbucks Chairman of the Board

There WILL BE unexpected Costs
There WILL BE unexpected Delays

What determines success is whether we wilt under the pressure or stand up, find a solution, and soldier on.

True.
English isn’t my native tongue, so I may have expressed myself somewhat clumsy. For all intents and purposes the carrier wave cease to perform its function and by that, I ment “disintegrate”.

Cheers, Cola

True…. While I do not know HOW the US radar LPI magic works, the point is that it does.

The only background X-band “noise” is generated by other X-band radars.

From other radars, reflections, drones, ECM, and decoys (MALD, etc).

Now, if the radio saturation is so high or the signal power is so low, that an RWR can’t pick up such low-power LPI signal, than radar’s receiving module won’t pick it up as well, since the signal will melt with background noise and no digital sharpening will do you any good, meaning, you can’t extract a code from within the pulse, because it has been disintegrated.

Ok, true i havn’t study radar technology, or any other military-specific science for that matter, but why is your receivers able to pick-up LPI while the other guys receivers can’t ? and with only the root of the energy at that.

Physics suggest the other guys receivers have the easier job, all things being equal.

The broadcasting radar can detect these signals because ti simply knows where to look. Since it sent the signal, it knows what freq and modulation to listen for.

Think of it this way: If you had to listen to the radio (all freqs) and wait for a 1 second beep, it will be easy if you know what freq it’s coming in on. the RWR does not know the freq and has to scan the entire band hoping to catch the beep as it changes channels.

The sending unit always has the easier job because it knows the freq of the pulse.

current LPI is conceived on a premise which overloads RWR, but not due physical (antenna) limits, but processing ones. Processing limits can be and are enhanced using more powerful computers and more refined filters (both hardware and software) and is a matter of time the LPI will no longer be LPI.

And by that time radar tech will advance further and LPI will be a generation ahead. Radar tech is always ahead of RWR tech.

Today, APG-81 (and btw, movie looks impressive :)) may well be LPI…tomorrow, we’ll see…

Um, no… APG-81 is LPI TODAY.

If we take his words for granted, then the all-singing all-dancing ALR-94 greatly lags behind TRUE detection of LPI capable-radars, even those with well-known characteristics, let alone something foreign. Assuming that in five-six years, every single major aircraft developer will have access to comparable/better technology, it raises a question – what is the ALR-94 good for?

Not going to happen. Where do you get 5-6 years? AESA LPI has been out for a long time and will continue to evolve it’s modes to stay ahead of the the RWR game.

While the ALR-94 is not so good re the F-22/35, it will work wonderfully in it’s intended role.

Here is a good writeup on LPI radars:

http://www.mar.mil.br/caaml/Revista/2007/Ingles/10-Pag40.pdf

LPI is a functioning part of the F-22 program, not a “concept”.

I think that part of you misconception comes from your perception that AESA = LPI. This is a wrong concept. I have not seen any docs that equate any European or Russian AESA with LPI (not even the APG-79 on the F-18E/F either).

Additionally, because the LPI signal is broken into hundreds of beams, the workload of the RWR is overloaded and cannot try and process all the low-strength beams.

The F-22 has been doing it for years without a problem against current gen RWRs.

LPI is not new, it has been flying on the F-22 for years and is better in the F-35.

The F-35’s APG-81 has newer T/R AESA modules and a better backend than the LPI AESA APG-77 of the F-22.

The F-35 will maintain it’s LPI modes throughout it’s engagement and will not have an increased risk of detection just because it’s getting a vector.

Look at this Youtube vid that shows the APG-81 doing a scan out to 80nm. Bear in mind how fast teach target’s full vector is determined and that this is with hardware from 3 years ago.

http://www.youtube.com/watch?v=CRkpFsXz9yk

Yikes…. time to pull up a chair, school is about to start.

Nah… IIRC the all aspect AIM-9L had a hard time to lock on Argentinas a/c in the Falklands, backside is the best spot to aim, and this is as true in areal warfare as in other aspects of life.

The F-35 will NEVER be carrying the 9L. The current Gen of AIM-9 is the 9x. The 9x uses and “Imaging Infrared” (IIR) seeker.

The older 9L only saw a blob that represented the heat source. The new generation of IIR seekers see different levels of heat as a b&w picture. Here is the picture of what the 9x sees.

This gives the 9x to attack from any angle and makes fooling it with a flare almost impossible.

Secondly i seriously doubt short range missiles are equipped or have any use of mid course updates.

The AIM-9x Blk2 has a datalink. Due to shrinking of circuity they were able to add it in without sacrificing any range from the Blk1 version.

I sincerely believe MALD and it’s followers will become a standard armament for any combat a/c.

The US is the only one who has MALD. A few things to remember:
1. MALD is slow and cannot keep up with the launching AC.
2. They are launched ahead of the attacking wave of fighters to act as decoys to lure away the defending fighters.
3. As soon as the enemy fighters get within IRST range, they will know they were fooled.
4. In order for anyone to try and use decoys against an advancing wave of F-35 will have to know that the F-35s are coming and from where. That, is not going to happen.

The first give-away will of course be made by RWR, like any other emitting a/c or ship.

The first giveaway will likely be the AIM-120Ds going active 5 seconds before impact since the F-35 is using a combo of off-board sensors, IRST, and a LPI AESA radar set for target aquisition.