Long-Wave Radar Can Take the Stealth From Stealth Technology
AbrasiveCat (999190) writes "In the continuing game of cat and mouse between offensive and defensive technologies of war, the technology of radar stealth may have been matched by new multiple frequency radar systems. U.S Naval Institute News reports the Chinese and Russians may be developing such systems. The present radar systems use high frequency waves for accurately locating an incoming target. Stealth aircraft are designed to adsorb or reflect these waves away from the receiver. It turns out longer wave radars can see the stealth aircraft. The longer wave radar lacks the precision of the high frequency radar, but when the two are combined, as the Russians, Chinese (and U.S.) are doing, you can produce accurate targeting radar. The F117 may have been in a golden age for stealth technology, it will be interesting to see if the F35 arrives too late to be effective against other countries with advanced radar systems."
A few months ago, 60 Minutes aired a series of interviews with Air Force personnel who were behind the F-35 program. All of them said more or less the same thing about the F-35: it doesn't matter if the F-35 is less powerful or doesn't handle as well as other jets, because it was built around radar superiority and being able to detect Russian and Chinese fighters before they could detect it.
If it's the case that the Russians and Chinese now have radar systems that remove that radar superiority, the F-35 now looks like even more of a gigantic waste of money.
Last sentence. Semicolon, not comma.
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Is Steath Technology a new thing?
Looks like they added some stealth technology to that "L"
We can just the nuke people who develop these Radars of Mass Destruction.
Longwave radar is not new,
http://en.wikipedia.org/wiki/Russian_Woodpecker
On modern weather radars every so called stealth plane is a sitting dug. ... hm, 1993? Or not so well known, as it is not relevant for a missile fight and the limited lock on capabilities of on board radar systems?
Well known since
Cost free eBook I read (by iBook/Kobo/Amazon/ObookO/Gutenberg etc.): "The Green Odyssey" by Philip Jose Farmer.
The F117 that was lost in the Balkans NATO mission in 1999 was shot down by an S-125 modified to use longer wavelenths than the RAM paint on the aircraft would absorb. The issue has been known since then and it's very likely that the F22 and F35 low observability design characteristics have taken this into account as much as physics and material science will allow.
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
Don't forget about passive radar systems.
Current stealth technology is mostly ineffective against it.
Articles like this have been around since the 1980s and have appeared on Slashdot before in regards to practically every stealth aircraft in existence including at least the F-117 and the B2.
Here's the kicker though: The long-wave radars that can sort of track stealth aircraft aren't able to track them with the precision needed to get a missile up there to shoot one down. If an adversary already knows that you are sending planes into a general geographic region, then the long-wave radar doesn't really tell them anything that they didn't know already.
Anyone in the military who has dealt with stealth technology will tell you that "stealth" is much more than a coating or wing shape that magically makes your airplane disappear. It's a whole strategy that uses technology + suitable tactics to make stealth work in practical situations. Stealth aircraft are not completely invisible and do not have to be completely invisible to be effective.
AntiFA: An abbreviation for Anti First Amendment.
Not only that, it's an active emitter, too. Easy-peasy to find and blow up.
And can't tell the difference between "adsorb" and "absorb."
Not impressive, but all too typical for the derpy degenerate version of Slashdot we see today, now that all the smart people left.
It will be interesting to see if the F35 arrives at all.
Stealth is at heart one of most top secret technologies.
I guarantee you, that people have been trying to improve it since before the Russians realized they could do the combo long/short radar.
The real question is, will the next generation stealth technology be defeated by this method, rather than the current generation.
That, is something we do not know and can not guess about.
excitingthingstodo.blogspot.com
I should say, former Eastern Block, that is. But, this is nothing new and has been known for some time now. They have these huge deployable radar arrays that operate in the VHF and UHF bands. Originally, it was due to their limited technology capability but then it was realized that there was specific advantages to using those bands. Notably, no one else is looking for radar in VHF and UHF so you could be being tracked and have no idea.
This is also how they took down a stealth fighter over Kosovo, they used 900MHz-band cell towers, tuned ground radar station to look for the return, and then manually guided the missiles until they were close enough (probably for the heat signature to become evident) to lock on.
I really hope this was all factored into the design of these multi-billion money pit of an aircraft.
and you sure aren't going to fit long-wave radar into a missile warhead
so stealth will still help in a fight, but long-wave radar systems will spot the aircraft (at least in general terms), so it removes the 'sneak attack' factor.
This actually seems like a good thing to me.
The sneak attack factor, even if never used, is destabilizing (which is why there's an agreement between the US and Russia to keep missile subs well clear of each other's shores, and why missiles in cuba were such a concern)
the F117 ushered in the stealth era (after flight surface control tech caught up with Ufimtsev's paper)
Yeah, private and public concerns have been trying really hard to push the idea that anything OTA below ~100 MHz is useless because it allows worldwide infrastructure-free transmission - and that's a threat to business and censorship. Ofcom (the UK telecoms regulator) has been shown to deliberately mislead about equipment which does not comply with HF emissions limits, allowing it to be sold even while other countries have used the same EU standards to outlaw equipment.
But HF and lower still remain the most interesting and useful set of frequencies for anything more than satellite/short range point-to-point, both for communication and detection. The Woodpecker was annoying, as were the old Soviet jammers if you lived near enough the curtain - but neither is anything like as frustrating as what's happening to the bands today! Let's hope this technology will bring a new-found respect for lower frequencies.
it was proven to be detectable by radar before the gulf war started and it rarely went on a mission by itself. most of the missions it flew were part of large groups including jamming aircraft. it was believed that the F117 would never survive on a mission by itself because stealth was always about having a slight edge and not total domination
The limiting factor was the computational power to asses all the targets since birds, bugs and everything else shows up as a hit.
Never heard of proofreading?
The lowest frequency you could use to track a target should be on the order of one that results in the target being 1/2 wavelength. Given the F35 is 16 meters long, that works out to about 10 Mhz. I highly doubt there is an effective way to absorb/deflect a radar pulse at such a low frequency (and depth of penetration) in an aircraft.
I've known this since the 1980s... I highly doubt that I'm in any way unique. I expect there are a number of spread spectrum 30-50 Mhz radars out there, just for catching "stealth" targets.
The F35 is a joke of an airplane.
It's a wishlist of everything compiled by senior brass, and structured in such a way as to foist off the R&D costs onto partner nations.
The F35 is, and always was, a terrible idea, overly ambitious, and a plan to put everything possible into an aircraft.
It's a giant sink hole of money which the US sucked other countries into considering as an option. And now they've all got massive sunk costs, and no viable aircraft.
Meanwhile, the F35 has been largely rendered obsolete by drones and UAVs.
It's a huge put into which money has been dumped, with no real results, and no actual outcome in sight.
In countries who signed onto this, this is largely viewed as a large swindle perpetuated by Americans and their defense industry to get other people to fund their pie in the sky wishlist.
The F35 is already too damned late, overpriced, and nor really something people should be pursuing. I'm surprised most countries have't told the F35 program to go jump off a pier and go find an actual plane which exists and can be flown today.
Lost at C:>. Found at C.
...it's a POS that is out-performed by the latest Hornets. It is a general use aircraft that is best at nothing. Of the new stuff, only the F-22 is worth bothering with as it's generally agile, but even then it's out-performed by the latest Sukhois...
Hundreds of billions of dollars, and it's obsolete and useless before it even gets out the hangar.
I do not fail; I succeed at finding out what does not work.
That stealth technology is vulnerable to long-wave radar is old, old news. I believe that the Aussies' Jindalee (JORN) radar has shown this a long time. Also, back in the 90s, the Russians claimed that there is no stealth for wavelengths longer than 30 cm (1 GHz) AFAIR.
Now the obvious problem is that it's not easy to make a compact radar for a long wavelength but if you can steer a missile close enough with a cumbersome radar then other sensors on the missile might finish the job off. Other sensor technologies are not exactly standing still.
At the same time, it seems that a lot of aircraft performance (and ship aesthetics) are being traded-off for stealth capabilities. I hope I will not have to see how this pans out. Or pay, as a tax payer, for the dumpling aircraft: I'm looking at you, F-35.
By the way, stealth craft are apparently also vulnerable to bistatic radar geometries.
The F117 may have been in a golden age for stealth technology, it will be interesting to see if the F35 arrives to late to be effective against other countries with advanced radar systems."
Is it just me or "to late to be" sounds odd?
On modern weather radars every so called stealth plane is a sitting dug. ... hm, 1993? Or not so well known, as it is not relevant for a missile fight and the limited lock on capabilities of on board radar systems?
Well known since
And the reason they show up on weather radars is because they are traveling with their luneburg lenses attached :)
Actual facts are that 1st gen stealth was picked up by a powerful 'long wave radar' at most 60km away. This distance is significant because you can expect next gen stealth to improve on this, and a bunch of the weapons that the F-35 carries can be lobbed either slightly inside or well outside of that range.
Ferrite and microfiber carbon attenuation never really promised a radar-low cross-section. It promised deflection and heat conversion.
Result was a temporary loss of acquisition range.
Now we have long wave but there was always multiband standing wave transform detection, 1250 nm laser plasma silhouette, multiband adsorption isolation and about 30 other techniques for finding the 'black dot'.
This was always a sales gimmick, not an actual solution.
A Wild Weasel and a properly tuned HARM missile from the 1970's might work fine. But in this case a GPS guided JDAM or two would be about all you need once you could get the location fixed.
"File to fit, pound to insert, paint to match" - Aircraft Maintenance 101
The S-125 wasn't modified for anything - but you have to get past the propaganda pieces and find the facts. The man who was the battery commander said there were no modifications against stealth.
What happened was simple: This was a mobile SAM site, and NATO had not located it. Further, those F-117s were flying the same routes over and over due to UN requirements, IIRC.
That F-117 flew too close to the site, the site picked it up and shot it down. It was detected at around 30km. Considering the long-wave P-18 radar which was operating non-stop because HARMs can't harm it (ha ha) - they can't home in on long wavelength radars - I'd say the F-117 did it's 'stealth' job quite well. The P-18 has a nominal range of 300km or so against fighters.
Going off of memory, so don't quote me on the numbers.
TL;DR: The F-117 shoot down over the Balkans actually revealed that stealth works as designed ... detection range for F-117 was 1/10th that of other fighters. With a long-wave radar.
ibid.
Except for one notable case, when has a large conflict started a "sneak attack"? Even Pearl Harbor wasn't really all that sneaky looking back... But you are correct, the ability to launch attacks with no warning is a problem, I just don't think it's as bad as you might think.
I would note that missile subs DO roam close to the advisories shores from time to time. A Russian sub spent a few months in the Gulf of Mexico last year according to Moscow, and I'm sure we returned the favor. We've been doing this to varying degrees for decades and although it doesn't look stable, it's apparently worked so far.
"File to fit, pound to insert, paint to match" - Aircraft Maintenance 101
The british sent to tornados (I think, so be in the 80's) to intercept a F114 because it left a hole in normal radar background.
Cellular Mobile Phone tower can also be used detect stealth airplanes for the see reason.
An example of a current Russian system for targeting 'stealth' can be found here ..
http://www.ausairpower.net/APA-Nebo-SVU-Analysis.html
it is an integrated system with VHF L-Band and S-Band components.
I mean what if nobody sees it when they do flyovers at the start of football games?
I'm surprised that F-35 critics have latched onto this DARPA paper written in 1985 that talks about using higher order harmonics to get accuracy out of long wave radar. To them it could be gospel for arguing against any stealth aircraft. http://tinyurl.com/Darpa-longw...
I don't want to do a sig now
Not entirely accurate, knowing that the plane location accurate to the cm 30 seconds does you some good but your JDAM is going to need another method once it gets closer to the target, gps alone wouldn't do, you would need visual recognition. Drone technology meets JDAM, problem is that you sacrifice maneuverability for speed.
I think stealth just arranges for reflections not to be bounced back at the transmitters. If you have a lot of receivers located in other places you'll still see the bounce. Sweden has a system like this.
Knowing an aircraft is present is one thing, being able to shoot it down is quite another matter. You can't use these low-frequency radars in fighter aircraft or missiles, because the antenna size would be too large. So you have to use a ground station to guide your fighters to an intercept point, and get close enough to use either IR missiles or get close enough for HF radar to work. But by then your non-stealthy fighter will be far inside the detection range of the F-35 and will have gotten a couple of missiles up its ass.
that the sort that can detect anything needs to be big and impossible to hide, particularly during operation. This means they are vulnerable to a strike from a hypersonic missile. i.e. The all seeing eye can't see much if you poke a stick in it.
Plus this story is just a beat up from some guys who want extra funding to try something that will defeat even broadband radar, and it will for a while, until somebody works out how to use the actual atmosphere as a reflector that will silhouette even a totally absorbing surface.
We seem to be putting all our eggs into the Stealth Basket. The technique used should depend on the situation. If you expect the enemy only has traditional radar (smaller or 3rd-world countries), then stealth is very effective. However, for more modern militaries, the sacrifices in design given to stealth hobble you because the planes can be seen yet are slowed by their stealth design.
We may need a set of planes that lack stealth but are quick and nimble. Then again, perhaps that's the job of drones because they don't have to worry about human limits to G's and can potentially flip and roll like nobody's mother. (Just hope your radio signal is not jacked into.)
Table-ized A.I.
Send in the drones, both real and virtual. Overwhelm the adversary with inexpensive fake targets and spoof their radar returns. Let their SAM batteries blow their load on tin-plated paper mâché airplanes and let their interceptors chase ghosts. All the while... watching from far above, waiting for the real GO-time.
The latest generation of Radar is the Active Electronically scanned array. No more rotating antenna. The whole unit is about the size of a carton of milk. There are dozens to hundreds of small antennas. They operate on a wide range of frequencies (each can be different). The beamwidth is usually between 120 and 170 degrees. Its a low power solid state device (using MESFET's). Long waves aren't traditionally used, except for over the horizon and ground wave radars. If using RAM (radar absorbing material), low radar cross section and oblique reflection are no longer useful, we still have plasma generators. Plasma's disrupt em rays (like radar). The fun continues...
"Adsorb"? "To" instead "too"?
Succeeding generations are actually far better at fighting the last war than the next one. The necessity of dreadnoughts and battleships was a foregone conclusion until the development of the aircraft carrier. Similarly, if you are of the opinion that human pilots are currently more effective than missiles or automated aircraft, you ought to provide a little more in the way of reasoning, and to suggest that this is an immutable fact requires a wild stretch of the imagination.
For my part I would say that anyone claiming that a particular mode of warfare is obsolete is likely to be correct, especially if it pits expensive, highly trained, fragile and fallacious humans against the mass production of less intelligent weapons. I would further say with certainty that this century will see the last fighter pilots; you and I will outlive their careers.
For literal decades.
The first radar systems were actually long wave radar. If anything much longer wave then anything used today. They required massive antenna arrays and were used to spot German raids on the English coast.
The Russians learned about radar from those systems and while the US and English subsequently went with short wave radar systems, the Russians stuck with long wave radar systems. This is why their radar systems look so very different from ours. They're receiving a different type of return.
There are pros and cons. But the the long wave basically sees everything. The drawback is that the return is very noisy. You can combine long wave and short wave or just employ very good signals processing on the long wave to get a clean picture.
Stealthing an aircraft from long wave have never been accomplished.
This is very bad news for the airforce that has invested a lot in the concept of stealth.
Absent stealth we're back to the old paradigms of speed and altitude. A hypersonic bomber for example would be very difficult to intercept at least without a hypersonic interceptor missile. Add to that all this drone stuff...
And I think I have a better way here... Its crazy... but war is crazy. What about an extreme low altitude bomber drone. I'm talking about a drone that would fly super sonic or hypersonic about 20-50 feet above the ground.
Now, I know what you're saying, "how do you stop that thing from randomly crashing into something." By mapping the terrain from space with extreme precision. Then you work out an exact flight path through enemy territory. By all means have it fly at higher altitudes before the bombing run. But when its going to enter dangerous territory, have it fly as close to the deck as possible as fast as possible. Have it scream in so fast and so low that their radar can't see it and can't intercept it. The bomber would be making course corrections at the speed of a high speed computer. Possibly thousands of course corrections per second. Whatever is needed. The plane would obviously have a lot of momentum so changing course by any large degree of angle is not possible but tiny corrections all the time are possible. And the point of the mapping is to get a course that the drone can handle at that speed and altitude.
Then you fire the drone off like a missile. It travels to the start of the run, drops to the attack attitude, goes super sonic or hypersonic, it will be close enough to the ground that ground effect turbulence might be a factor and that would be something the guidance system would have to deal with, it would drop its bomb which would be one a short delayed fuse, and then it would continue to race along until it got out of enemy territory. Where upon it would pull up to a safer altitude, possibly slow down, and head for a friendly airfield for refueling and maintenance.
The above is my crazy solution to the problem. To those that say "but what about peace"... I have no problem with that. But that isn't the issue here. The issue is how to do fight and win when peace fails. Having something like the above weapon actually makes peace more likely and sustainable because hostile forces understand that if they do something nasty you can hurt them.
Nothing is as likely to make hostiles attack us as the belief that they can get away with it.
I've decided to stop wasting my time responding to AC trolls/sockpuppets... so if you want a response from me... login.
This has been a known Achilles heel for stealth technology since it first came out.
Take a cheap Furuno surface search radar play around with the main frequency and the pulse repetition frequency, and not by a lot, and all of the sudden things that never painted before suddenly appear.
This is one of the main principles of mine detection sonar. You can make fairly large changes in the output frequency to really tune the thing once you know the relative size and shape of the target you are searching for. Torpedo's do the same thing. The search on a relatively low frequency then when the algorithm thinks it has something it switches to frequencies typically 10 to 20 times higher for high resolution aiming. The exact same principles could be applied. AWACS could search and much lower frequencies then vector fighters in with the ability to not change the frequencies a lot, but lower them down to just above the thresholds for the very small antennas. Close enough and no matter how the target is shaped you will get a return.
Hey KID! Yeah you, get the fuck off my lawn!
No. while long wave radars are capable of detecting the presence of stealth aircraft they can NOT be used to target or guide munitions to the aircraft, you need shorter band (e.g., X-band) radar to actually guide a missile to a fast moving target like a fighter jet. X-band radar is effectively mitigated by the low-observability features of the F-35 and F-22.
Additionally, long wave radars are really easy to jam with modern jammers because the wavelengths are so long; the jamming equipment can recognize the radar waveform (and generate a canceling wave) much faster than the radar transmitter can adjust its waveform.
Finally, long wave radar installations need to be BIG. This means they will be fixed, easy to find and easy to neutralize with low risk strike assets like cruise missiles.
I remember in the early 2000s hams were tracking stealth aircraft in the Nellis pattern by listening to the multipath bounce off them from local rock stations (rock works better than NPR due to the fact that the carrier is more consistently modulated). The state of there art for passive multistatic radar has improved a lot since then with those little SDR dongles being available. Sync the clocks and fine tracking of stealth aircraft is dead easy.
The lastest thing is negative index metamaterials. Reduction of backscatter and absorption is the 1980s.
http://www.metamaterials.duke....
In GOD we trust, all others we monitor.
When flying in civilian airspace they have to have their mode C (altitude reporting) capable transponder turned on, so of course they'll show up on radar. You can't have hardly radar-visible aircraft flying around busy civilian airplanes.
as long as US and China have technological balance, they will behave reasonably, since no side will have exagerated fear.
All you need isd to have enough accuracy to know you are within range of the warhead, which then explode and send shrapnel in a circle.
Hey, this is not news! Of course, if you want to absorb waves with dampening material, you'd have to have a depth of the material of around a quarter of the wave length. This is know in acoustics as well as RF engineering.
So the news would be that some parties are developing radar systems with combined low- and high frequency excitation.
At least at this point, both Russia and China have rock-solid finances, while the U.S. let themselves be bankrupted by all sorts of corrupt actors: New York finance, weapons makers, medical industry vultures.
So, reality does not support your argument.
I recently used a low-end Chinese-made oscilloscope for some CAN work and it worked quite nicely. They might not be able to compete with the highest-end HP or Tektronix scope, but sure as hell they know their shit where it matters.
The ugly chicken also brings Mig21-class aerodynamics on the table.
Actually, the latest ground-based Radars and the latest electronics/sensors and missiles put into Mig21s would probably be more than sufficient to defend airspace against U.S. intrusion.
I worked on an AN-FPS35 radar in the 70's. It used 430 Mhz (UHF) not microwaves. A nifty touch was it used frequency agility for anti-jamming and pulse compression to attain high Pav while maintaining high target resolution. I bet this thing could nail stealth easy.