The insane engineering of the F-35 AESA radars!

We use the announcement of the APG-85 to replace the APG-81 as an excuse to dive a bit deeper into AESA radars and their properties.
Enjoy!
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[@BasedF-15Pilot]

I'm an F-15C pilot. Believe it or not, the APG-63v3 radars are significantly better for air to air missions than the APG-81 1. more TRMs and 2. no air to ground TRMs. Multi-role radars hamstring the air to air effectiveness of detecting and tracking. Size real estate (# of TRMs) is also a big factor, as you covered in your video. These advantages routinely allow jets with the biggest radars to shoot down opponents before opponents were even aware they were in danger, as AIM-120 doesn't alert the other jet's RWR until it goes pitbull. This is one of the biggest reasons for the push for data links, allowing smaller jets to get information from AWACS or larger jets. There is a reason why Owls have huge eyes. Bigger is better. Bigger airframes also have more space for cooling. We also maneuver better in the cons (thin air above 30k feet) because big wings catch and hold more air. F-16 and F-35 skate around like a hot knife through butter up high.

[@Millennium7HistoryTech]

Thanks for pointing out!

[@atlet1]

In clear sky, all missiles give themselves off to modern missiles warning systems, the moment they are fired. The numbers of TRM is not the only parameter that decide output of radio power. Aperture and output power/TRS is equaly important. Can you eplain in detail how this number affect the capability of the radar, please?

[@piotrd.4850]

I believe that one version of F-15 radar could be datalinked with other radar to increase aperture?

[@Youtubeuser1aa]

🤫 no more talking please

[@carisi2k11]

Except the F15 keeps getting smashed by the F35 and F22 in war games because it is unable to detect it with it's radar.

[@ronbridegroom8428]

As an engineer involved in the design and production of the APG-65 Radar (flat plate antenna) I am really appreciating you great explanation of AESA antennas.

[@mobius7089]

How much does a mechanical scan radar like the -65 increase RCS when it's moving?

[@craigwroth9352]

Wow, I am an electronics engineer and I learnt something. A+++ technical video. So I think this should be part of the training for real pilots.

[@DominikPinkas]

it probably very much IS

[@housemana]

learnt?

[@GSteel-rh9iu]

@@housemana That is correct.

[@salahidin]

When knowledge meets discernment.

[@arthurwilliamson]

Another excellent video. Thank-you for sharing your knowledge with us.

[@MostlyPennyCat]

There was a paper with a subsequent practical implementation for active self-interference cancellation, allowing simultaneous transmit and receive on the same antenna. Uses similar techniques to noise cancelling earphones. No doubt this is already in the latest radars.

[@hphp31416]

EM cancelling system would eventually allow for fully stealth designs like cloaking technology from star treak

[@paristo]

@@hphp31416 en.m.wikipedia.org/wiki/Plasma_stealth That is one most hyped features that Su-57 was claimed to have when the fighter was revealed and it was mythical by its features. As who would be able to do that, they could effectively become transparent to RF spectrum.

[@j.d.604]

@@paristo The SU-57 has the ability to do what exactly?

[@MostlyPennyCat]

No this is just a technology to allow a transmitter and receiver to simultaneously transmit and receive on their shared antenna. It has nothing to do with stealth.

[@ftboomer1]

AESA can also be a communication antenna. Great video. Thank you!

[@valenrn8657]

StarLink has AESA based communication dish.

[@chadbernard2641]

Great episode, I enjoy the longer ones much more. So much more knowledge to be gained from these kind of in depth episodes.

[@amzalkamel3009]

The next step on fighter radars is digital beamforming which was impossible until recently due to size and weight constraints but electronics miniaturization has done it's thing...though I wanted to see your take on the APG-85 like you said in the title, but it maybe for the next video

[@amzalkamel3009]

@@gags730 I'm no expert on the subject but I will refer you to this video which is great kzbin.info/www/bejne/pmjdiHV8ZrWSeNU

[@amzalkamel3009]

@Gags you're welcome buddy :)

[@MostlyPennyCat]

Digital beam forming was present in WiFi 802.11n, at least a decade old. PESA uses beamforming, either in the analogue or digital domain. It's the bit where you change the phase to change direction of the beam without moving the antenna.

[@studytime2570]

@@amzalkamel3009 well your reply isnt visible. Did yt remove it for some reason🤔

[@michaelrenper796]

@@gags730 Well, in 5G you have maybe a dozen antennas to control and the target is moving around at a few meters per second if at all. In a jet you control about a 1000 antennaes (the pictures seem to show such a module count) and the beams have to be adjusted perhaps a 100 times per second ....

[@davidkillens8143]

Thank you very much. I know I can never be an expert on this field, but this one video has expanded my knowledge of radars by a quantum level. I will have to watch this video a few times to digest everything and come to a basic understanding, but it will be worth the time and effort. Once again, thank you for this video. I have a folder in my bookmarks named "Science and Understanding", and this one video now resides there.

[@byloyuripka9624]

a "quantam" level... does that mean an unimaginably minute amount?? 🤣

[@anirecapped.]

@@byloyuripka9624 I think he meant to say a quantum leap.

[@555mimas555]

It was absolutely splendid presentation Mill 7! One of my favorites on your entire channel.

[@pancho5765]

This is one of the best channels I have ever seen! you’ve been a big help! thank you so much and keep it simple.

[@phelansa23]

I love the way you present very complex information in a way anybody can understand. Great video. Thank you.

[@scaling_slav]

Excellent video, I'm in no way an expert, just like to know more about fighterjet technology, and I understood everything here, which is a sign of your superb skill to transfer the knowledge. Thank you

[@charleschidsey2831]

Great presentation! I would like to acknowledge the time and effort involved in producing content such as that found in this video. Above and beyond that, may I compliment you on your delivery which, on such a technical subject, remains fluid, comprehensible and, at times, humorous. Again, great work my friend!

[@NonEuclideanTacoCannon]

GaN is pretty exciting stuff. For example, the old motor controller on my electric motorcycle was standard silicon, it was heavy and about the size of a tissue box. It overheated and died. New one features GaN components. It's 1/4 the size and weight, with an extra 1000 watts output. Similarly, my new phone charger block is the size of a standard iPhone charger, but charges at 65 watts.

[@LRRPFco52]

Do you really have a GaN component electric motor controller in your motorcycle? What type of motorcycle is it and was this advertised, or a modification made?

[@cannonfodder4376]

A simply superb explanation of radar technology. Summed it up in 17 minutes and in a way even dumb old me could understand. Wonderful video.

[@jacobbaumgardner3406]

It occurred to me. When you mentioned several antennas around the aircraft, now with modules we’re no longer limited to having a single emitting region on the nose. We could place them wherever we wish on the aircraft, say on the wing roots of the belly, tail, or fuselage. Not just small radars but almost engrained into the machine. Similar to the F-35’s current RWR which is baked into the skin, but it’s just modules all over the jet providing images all over. Now there are probably limitations, but who knows.

[@kilianortmann9979]

Not just on one aircraft, if the relative position of the planes in a flight is known, that radars could work together, similar to Very Long Baseline radio telescopes.

[@vickydroid]

Interesting though, I was thinking about this but wondered if there might be dynamic issues to consider in the normal movement of the components relative to the different arrays. So whether a nose mounted and wing mounted arrays would be greater than the sum of its parts, notwithstand that the structural duties of the wing leading edges might not lend itself to arrays mounted behind them if optimisation for it's transparency to radar cannot be balanced. A longer base distance could some localised depth perception to the aircraft

[@aramisone7198]

The SU57 is supposed to have two small radars on each side of the cockpit and the one in the nose then small on the wings and one in the back.

[@hb1338]

@@kilianortmann9979 No. The relative positions of the different aircraft vary too much and too rapidly for a multi-aircraft array to be feasible.

[@hb1338]

@@aramisone7198 The radars are all separate sets and their antennas are dispersed about the aircraft in order to prevent them from interfering with each other.

[@oddy1637]

As always, didn't get disappointed since it is the best channel covering these topics.

[@sergarlantyrell7847]

I do find it amazing that the Eurofighter still uses a traditional (albeit flat panel) radar, and the AESA replacement won't be in service till 2030, 17 years after the rFench one.

[@MostlyPennyCat]

Fun fact: The SAMPSON AESA radar on the Type 45 air defence destroyer has three panel antennas AND rotates, making the scan speed the combined electronic _and_ rotational speed. For when even AESA isn't fast enough.

[@jonathanpfeffer3716]

Is there some reason for that? It seems unlikely that they would introduce additional mechanical complexity and thus maintenance and downtime on a radar unless they needed to, or if there was some benefit from it. What application would need even higher scan speeds than normal AESA radars already can produce? Hypersonics?

[@MostlyPennyCat]

@@jonathanpfeffer3716 First off, I made a mistake, it's two back to back rotating panels. An AESA panel can't see 180° of sky, so you either rotate the panel or rotate the ship. And the ability to see art high off angles is reduced, reducing your vision even more, so rotating is even more important. Aegis solves this problem with more than two panels, a more expensive solution. SAMPSON is designed to defeat supersonic sea skimmers, where fractions of a second is life, so scanning rate is life. Every fraction counts.

[@MostlyPennyCat]

@@jonathanpfeffer3716 This next part is speculation. You could have 3 or 4 panels that don't rotate. But maybe having radars overlap is a bad thing? Certainly is another problem to solve, filtering out each others transmissions. Whereas with two panels that can't ever interfere with each other. But with two panels, they _must _ rotate, otherwise you have native dead spots where the radar can't see, "shoot here to win"

[@jonathanpfeffer3716]

@@MostlyPennyCat Makes sense, that’s certainly an ingenious cost saving measure, although I doubt the improved scan rate would really come into play just given how (as the video describes) GN AESA radars are basically instant already. As to your speculation, the way you get multiple radars to not interfere with each other is just done by angling them correctly and using some fancy software to filter the side lobes out. That’s what American destroyers do.

[@Viking99ca]

Once again an extremely complex topic lucidly explained. Bravo and thank you.

[@andik.4235]

Thank god we are back on track learning something which will stand the test of time. The title was a bit misleading in that regard. Thanks for explaining radar technology for laymens like me.

[@brandonbarr2784]

The pilots in f35 don’t even call it a radar anymore since it does much more

[@post-humanentity8206]

I am a highscooler, that likes physics, but is not good at it. I did not understand anything, but I managed to convince myself i got the message. Video is 10/10.

[@garywatson]

AESA radars are cool. Would like more on this topic.

[@Millennium7HistoryTech]

Thank you very much! There is a little bit more to come, actually.

[@cliffordterry2133]

Always among the most informative videos to watch, and yet, entertaining as well. Thank You!

[@ryoder]

Many years ago I was in engineering college, and working alternate semesters as an "engineering coop" for a large US aerospace/defense company. I spent one semester term in the Attack Radar dept, assisting an engineer who was tasked with convincing USAF (or any other AF) to fund an AESA project which was currently being funded in-house. One day some of the engineers met with representive of a foreign customer, to give the pitch for AESA funding. (I was not in this meeting.) After the meeting, one of the engineers came back to our cubicle farm, frustrated as hell. It seems upon explaining how AESA worked, caused one of the foreign reps to immediately inquire about the possibility of LPI applications. And our engineers were forbidden to even discuss that aspect with foreign customers.

[@Millennium7HistoryTech]

Thanks for sharing

[@jpperrault3072]

Wow, i took some basic training as part of my job... And your 17 minutes video just informs/teaches better about the technology... You should offer classes

[@HesTNTonPMS]

GREAT job man ! Very valuable station you operate here sir !

[@PrimarchX]

It was a surprise. There must be significant capability improvements to warrant the change.

[@jpierce2l33t]

I love all of your videos, but the ones like this on technical topics are the reason I fell in love with this place. This is GREAT man, and please keep 'em coming! (Maybe EW next?! 🤣)

[@jgrenwod]

Big jump from the APN-59 I worked with quite some years ago.

[@MikoyanGurevichMiG21]

The best military aviation channel on KZbin.

[@borissljukic1470]

Theoretically, if the radar beam is narrowed from 33° to 3° for the same distance, the signal strength is reduced by 19.6x.

[@tommarquez1980]

I can imagine the conversation between the scientists in charge of radar developing: “so… what are you up to, guys?” “Well… we’re working on a device that virtually creates some map like Call of Duty, but from a real airspace” “Mmm… sounds interesting” “it also can send moaning sounds to enemy radars!”

[@andresmartinezramos7513]

"Your budget is approved"

[@dirtyfnd]

Thank you so much for this. I have always been so curious how these systems work. You have provided such a clear and concise explanation that's easily digestible. You are a boss!

[@Desire123ification]

15:15 The Gripen E employs the most GaN of any aircraft, making it outstanding. (Excellent Video)

[@atlet1]

Currently Gripen E have GaAs in the nose AESA and the Gripen C is being upgrade to GaN nose ASEA plus the Avionics of Gripen E, and more powerful engine. Gripen E will be full GaN(and SiC) soon.

[@gustavb3673]

@@atlet1 The radar upgrade for Gripen C is to MK4 so it's not an AESA radar. There are some indications that Gripen E might get a completely new radar in the future, it could be the SAAB GaN based one but there is no real information about it yet.

[@LRRPFco52]

Incorrect. Gripen E will never have as many GaN TRMs in its nose and wingtips, even compared with a single AESA in the F-35. The US pioneered and controls the supply chain of GaN TRMs, which have gone into F/A-18A/C+, F/A-18E/F Block 3 with APG-79(V)4, and other programs not mentioned publicly. The US stacks TRMs closer to each other than any other nation’s Radar assembly companies, who are using a lot of licensed technology from Raytheon via Foreign Military Sales and technology sharing agreements. Old F/A-18s in USMC and RCAF service have a superior Radar than what is currently in any of the Gripens, including the Gripen E. The one area where the Gripen E has an advantage is the ability to rotate the AESA to provide side aspect continual tracking after offsetting abeam of airborne fighters in the BVR timeline. But since the Gripen’s Radome size is so small and the Leonardo Radar doesn’t have high TRM stacking density, its maximum detection and tracking ranges will be limited compared to a Hornet+ or Super Hornet Block 3, let alone anything 5th Gen even with GaA TRMs.

[@atlet1]

@@LRRPFco52 False! SAAB is the leading company in GaN tech and the whole supply chain is in Sweden. Only Gripen have GaN AESA, which are several times more powerful than GaAs. Even the range of wavelengts is bigger. The area of the nose antenna is approximately the same in Gripen as in F-35. The elements in the distributed aperture system in Gripen is approximately the samme as in F-35. This make Gripen AESA more powerful, especially in a tactical mening.

[@valenrn8657]

Some USMC F/A-18C have GaN AESA radar i.e. Raytheon APG-79(V)4.

[@billthomas635]

I knew all about RADAR 60 yrs ago. Thanks for the crash course.

[@ianmangham4570]

Even the starlink antenna is absolutely mind boggling and totally AWESOME 😮

[@JonMartinYXD]

It's too bad that even PESA is still so expensive. The US National Weather Service got to borrow a Navy PESA radar and test out the technology's potential for weather radars. The results were fantastic. Scans done in a hundredth of the time it takes traditional radars. Doppler capabilities built in so tornado warnings could be issued sooner. Of course it is still able to do its original job, so in addition to monitoring the weather it would also provide a near constant picture of the airspace around it for the FAA.

[@GabrielVitor-kq6uj]

Omg man!!! I just can't bring myself to adress precisely how much sheer unbiased knowledge you can put in such short videos!!! You're incredible sir!!! Seriously, please keep up with your awesome work!!! I love how you closely and deeply talked about lesser known or even misunderstood jets, (usually by american propagandas) like the Gripen and the Felon per instance! I really appreciate it sir!!! Thanks again for sharing your knowledge with us.

[@alleycatsphinx]

It's even more amazing how much he CANT put in. 😂

[@GabrielVitor-kq6uj]

@@alleycatsphinx LOL yeah

[@valenrn8657]

FYI, F-35 didn't skip the "active stealth" feature when coupled with passive stealth.

[@valenrn8657]

From "Out Of The Shadows: RNLAF experiences with the F-35A" via Combat Aircraft Magazine May 2018 F-35A Block 3F used its "active stealth" feature to hide the Blue team's friendly F-16A against the Red team's F-16A MLU.

[@EbonySeraphim]

0:45 - that, my friends, is a screenshot from Digital Combat Simulator (DCS). It’s the F-15C from Flaming Cliffs 3.

[@RobertoPietrafesa]

A masterpiece video on AESA radars basic meanings. Thank you, gentleman.

[@evilpandakillabzonattkoccu4879]

I LOVE tis channel! I've been obsessed with aircraft since I was kid and this channel keeps that obsession alive! Thanks for posting such in depth information!

[@sirdamianmental]

Outstanding thanks I worked on OTH radars in a different life but I nearly understood some of that ! A credit to your ability to explain mind melting concepts to the less mentally agile.

[@imd-in67]

I'm greatful for the video, I was just waiting for it 📹♥️

[@jackyjackerson825]

i see aesa i click

[@Dasycottus]

I feel like i might actually understand like 0.1% of this now... That means your explanation was pretty outstanding

[@batuhanvoid5849]

very good explanation...

[@ELMS]

Me, scrolling my feed: “Boring, will watch later, not interesting…Oh! Millennium 7*! Must watch immediately (after I leave a thumbs up)”

[@jfrorn]

Awesome information, expertly explained, thank you!

[@michaeldenesyk3195]

Bravo! Great presentation and masters class on what is out there!

[@Tango246]

You're an electrical engineer? My grandfather was one for Bell labs. I miss him.

[@sleepyancient6655]

Wait, it came out of the blue? What? How was I aware of this a couple months ago? Seriously, I should not know anything before this channel.

[@markusoswe]

Brilliant. Your videos keeps getting better.

[@user-pw8ks8mq1d]

Kept hearing AESA-AESA. Let's check it out. In Greece, we already turnt our first 6 F16s into block 70-72 with AESA Radars. The most modern F16s worldwide, which makes them effectively Gen 4,5. 80 more to follow. The rest 75 will remain block 50-52Adv. (Gen 4). Incidentally, we also receive the latest HARM (Anti-Radar) and Harpoon (Anti-Ship) missiles for them. We also received Rafale aircrafts with AESA Radars as well, same case with latest block 3 Exocet missiles and Anti-Air Meteor which supposedly on paper guarantees one shot one kill. They also carry our semi-strategic SCALP missiles. Last but not least, our order of F35s has been approved by US Congress and the process finished. Unfortunately, they will be here 2027-8 due to high demand. Our Mirage 2000-5 are also upgraded. Pretty sure we'll be OK Airfoce-wise. Ours will only be matched with Israel's in the wider region. Thanks for new Kits for our F16s, US guys. Always allies.

[@Logarithm906]

9:40 "no radar can emit and receive at the same time" Bistatic, FMCW, radar altimeters, and $5 automatic door openers above every public building's entrance since the 80s: Am I a joke to you? :P

[@Millennium7HistoryTech]

I had been waiting for this comment since I published the video! It took 4 days...congratulation for bring first!

[@alvaropenen2118]

That was a great class of Radars, thanks for publishing.

[@ew3612]

very interesting video. Im going to rewatch it tomorrow but I will have a note pad to help me remember it.

[@kathrynck]

Or you can keep the larger cooling system, and pump more power through the GaN... Also, when using it for jamming, the new advantages with narrow beam propagation give not just more range to radar, but more potency to jamming. And all without needing to put a lead-lined bib on the pilot ;) (for those who were wondering, the main difference between APG-81 and APG-85 is going from GaAs to GaN, and adding 3 new EW modes)

[@j.f.fisher5318]

Nice. I'm betting that's why there's a move from speculation on AESA radars being used as DEWs to the possibility being part of the USAF NGAD.

[@kathrynck]

@@j.f.fisher5318 Looking over my DC uno cards, I'm gonna play "I don't seem to recall". It's a much stronger card than "I'm not at liberty to say" or "I don't have that information in front of me right now", as it gives unlimited plausible deniability for one turn.

[@Marcellogo]

Note there are also Hybrid PESA RADAR (Bars, Irbis and so on..) i.e.radars that has an emitter/receivers module for each antennas but still has a single TWT for generating radio waves. This allow almost all the advanced features of a an AESA radar but to keep a lighter and steerable antenna (that however didn't need to scan constantly like a mechanical one but can be pointed sideways so allowing a complete FOW) Only thing it cannot do is emitting at two different frequencies or direction or modes at the same time so it is a little less flexible and a little less capable for what it came to low probability of intercept mode.

[@princesofthepower3690]

Irbis has 2 TWT’s and thus 2 transmitters. The advantages of AESA is mainly reliability and jamming. But AESA has the potential to have greater bandwidth but is hampered by this due to beam steering technology.

[@michaelrunnels7660]

If stealth is considered to be a necessary characteristic of fifth generation fighters, then the AESA radar is required in fifth generation fighters because it's the only radar that is stealthy. All other radars broadcast their presence like a flashlight.

[@LeonAust]

X band has a hard time targeting stealth

[@bigman23DOTS]

Upgrades are just part of operating fighter aircraft The Australian hornets then super hornets were constantly being upgraded to keep them relevant

[@alleycatsphinx]

It's amazing that no one has thought to make the entire outer surface of the plane an aesa radar. 👽

[@shi01]

You have to cool these elements, similar to a cpu. So this is really not an option.

[@alleycatsphinx]

@@shi01 well, maybe not for a traditional jet.. but perhaps if you could pulse plasma all over the surface of a zeppelin you could create a different sort of craft.

[@pompeymonkey3271]

Huygens would have loved this technology!

[@julianmorrisco]

Where have I heard this before? Audio! I am a retired audio engineer and not long before I retired the combination of arrayed monitors (speakers in caninets) and digital signal processing (DSP) was revolutionising mainly audio reproduction but also capture. Have you seen those large stacks of ‘speakers’ at a rock concert? Often flown (as in suspended) and curved slightly in a convex way pointing towards the audience? Same principles as laid out here. Phase delays, originally using analogue delay circuits but more recently DSP applied to individual drivers (speakers) enabled sound to be focussed where it is wanted. And calculated use of short digital delays also enabled stacks to be placed anywhere as the signal could be delayed taking into account the speed of sound to synchronise the sound waves throughout a venue. It tickles me that all these different fields converge into the meta field of signal processing. Whether it’s a digitised audio signal or radar radio waves, the principles are the same. Visible light is kinda it’s own thing because the wavelengths are so small. Quantum and other effects apparently screw up the processing algorithms that work fine for audio and radar wavelengths but most of this works, with exceptions and reservations even with uncorrelated (I.e. - NOT Laser) light.

[@flantc]

Good video. A few points. AESA/PESA are often still movable due to the mentioned scan angle limit. I'm sure you are aware of this but I don't recall it being discussed. You covered many of the additional capabilities of AESA systems. As an extension of the passive capabilities, AESA systems could be synchronized with external emitters and passively generate high fidelity data. You touched on heat rejection. This is one of the primary problems facing modern military aircraft. You may consider doing an video just on this topic as AESA radars are just the tip of the proverbial iceburg.

[@LeonAust]

Australian CEAFAR has 5 faces with AESA fcr

[@Turboy65]

Consider this possibility: Whether or not the APG-85 has some very special capabilities I may speculate about, a future version probably WILL. So what is an AESA radar system? In short, it's a very powerful and flexible RF transmitter/receiver system with enormous bandwidth and a very broad operating frequency range. It can be precisely controlled digitally to generate virtually any arbitrary waveform with appropriate software. Or to receive virtually any arbitrary waveform, if it has the software for it. It can be thought of as a highly capable transceiver with enormous bandwith capacity, under full digital control. What it can do is subject to the imagination and programming skills of the design engineering team that builds it. Not just radar. Assume it's a far more general purpose transceiver. Or it CAN be. Software determines capability. Imagine that it could function as a high power airborne wifi access point. And much more. It could even have capabilities that overlap into the ECM role.

[@arbelico2]

Wow ... . I would like to make a suggestion about a series of chapters on electronic warfare : intelligence , jamming , decoys , countermeasures , etc. . Thanks for your time .

[@hb1338]

Very little of the really interesting stuff in EW technology is anywhere near the public domain, and rightly so.

[@arbelico2]

@@hb1338 True but I have seen some articles and videos from a Spanish channel "portierramaryaire" that are interesting. But I think this channel can offer something "more" and "more synthesized". Thank you .

[@NesconProductions]

Excellent material covered here as always! I'd be curious to hear more about the detection capabilities of different IRST systems currently being fielded 🤔. Having a highly refined / integrated IRST system has the potential advantage of keeping radar systems in passive modes (thus minimizing return signatures). Allows for firing of BVR air to air missiles without having to 'illuminate' the target. Best wishes!

[@g412bb]

Current gen (semi) active missiles don't need guidance from the source so no need for "illumination" . Just to be able to detect the targets is where the game is at then launch and steer the missile in a general direction until the missiles guidance system takes over. This can be done with passive systems like AESA in passive mode or IRST. The analogy with how submarines operate is also more and more applying to air warfare these days. Also more likely the detection will be done by platforms like ground radar / AWACs and maybe even SAR equipped satellites. Much harder to hide an aircraft than a submarine from those.

[@larcrivereagle5559]

Don't forget you still need ranging information, not just direction

[@sgt.grinch3299]

Thank you. Very good explanation.

[@sirbum1918]

The next Radar system "SHIT" (So Hot It's Terrifying) will be unbelievable!

[@perelfberg7415]

Super interesting to see the dispersion of the recevers all around the gripen!! Did not know it had such coverage. I remember when you did a video of the Su-57 you mentioned long pannels on the sides or of it was the wings that potentially would be in the L-band but you were wondering abit if it was true. Are they built with the same type of elements as the one you described now but with a different geometrical shape or do they build on different technologie? Is it just the size of the plate that limite what band ot can send in or are there other factors? Have ypu heard any thing more about the "L-band" on the -57 Thanks for a super video!

[@gustavb3673]

Gripen E is full of sensors of different types, it has 50 antennas for a sphereic all around coverage.

[@nateb1804]

Great info dump on an obscure topic!

[@StewartEntertainment]

Fantastic video! I’ve been watching your stuff for a while, but now you got a new sub! Keep up the great work!!

[@jimmycummings8164]

Thanks for the explanation.

[@happysalesguy]

Wow, that was really interesting! Thank you.

[@crimestoppers1877]

Fascinating but now I have a few questions: 1) Does this AESA radar require that each aircraft knows every second EXACTLY where it is located in relationship to the earth AND and each one of its friendly aircraft? 2) What happens if the defending systems use VHF or HF radars that are widely distributed outside of the conflict areas? If the defending system is always transmitting ( broadcast radio, TV, mobile phone towers) at RF wavelengths related to the physical sizes of the aircraft, the FACT of the intrusion could be detected along with some relatively accurate location and altitude information?

[@davinhunt7558]

Ive enjoyed watching the quality of your vids and information increase!

[@ivanzlatar2445]

This is one of my FAVORITE videos from you @millenuim ... THANK YOU ! JAM PACKED WITH INFORMATION !

[@realomon]

Same principal as modern medical ultrasound systems and their active matrix transducers, but with sound waves instead of electromagnetic ones.

[@elpepelucho]

from one nerd to another, you're awesome!

[@maximilliancunningham6091]

Excellent !

[@iglooone7165]

Perfect pitch, great video as usual. 🎯👍🇫🇷

[@patrickchase5614]

Maybe worth noting that GaAs AESA radars had significant limitations in terms of peak output power, which is in turn needed to burn through jamming. This wasn't a "deal breaker" for fighter-sized platforms where the total power was limited by the platform, but it explains why terrestrial PESA radars such as Patriot's MPQ-65 and Aegis' SPY-1 remained PESA until the advent of GaN MICs allowed similar power levels in an AESA. At about 11:20 you describe AESA radars as being able to "instantaneously" search the entire volume, but that's really only true when low S/N (and therefore short detection range) is acceptable. For maximum-range search and similar cases where very high S/N and therefore high power on target is needed, the resulting dwell time is more of a constraint than the mechanical scanning rate of a conventional radar or the phase-shifter settling time in a PESA. Where AESAs really excel is in their ability to efficiently _track_ very large numbers of targets while maintaining periodic scanning, and also their ability to maintain near-continuous coverage with low power for things like short-range horizon search. The most modern AESAs (ones that do beamforming and doppler processing in a single pass rather than sequentially) also excel in their ability to receive "from all directions at once" (i.e. they can use the signals from the MICs to concurrently synthesize receive beams along many axes), which is a key enabler for multistatic radars, wherein the direction of the return can't be predicted. It will be interesting to see if the Chinese continue with their Luneberg lens LF radars (which intrinsically provide a similar capability, and are undoubtedly multistatic) going forward. I disagree that the beam can be "very very narrow". AESA sets are constrained by diffraction just like every other antenna, and the best mechanically-scanned antennae were already quite close to that limit. The beam-width is ultimately determined by Rayleigh either way. I would argue that the fundamental enabler of an LPI radar isn't so much the ability to emit on "any frequency" as the ability to emit on arbitrary broadband frequency "fingerprints", which are extremely difficult to detect unless known a priori. There is a very fundamental similarity between CDMA cellular systems and LPI radars in this regard. wrt having the radar emit multiple beams concurrently, my understanding is that doing so is fundamentally problematic wrt monopulse processing (which you didn't address but which is a "must" for good angular resolution).

[@Millennium7HistoryTech]

Thanks for the explanation.

[@vickydroid]

Bravo completely distracted me from my chores...just to date me I remember GAs Photo Diodes becoming a thing after Silicon PDs, now I'm wondering what wonders of SA can be achieved with these things on something the size of the Mig31 or indeed the NGAD Fighter

[@syedimranshah4721]

It is not strictly an AESA related question but the radars of maritime strike aircrafts. Study reveals that anti-ship mission needed specialized radars. The most famous is French Agave radar (and Anemone radar) which was used with Exocet missile onboard Dassault Super Etendard and Mirage-5 aircrafts. These special radars were not good at air to air modes. Did the Marineflieger Tornado aircraft had a different radar than that of Tornado IDS, for using Kormoran anti-ship missile? It would be the same for UK marine Tornado versus Tornado GR4 of the RAF.

[@LukasAzzolini]

Beautiful explanation as always! Rooting for 100K subs in 2023 👏🏻

[@Millennium7HistoryTech]

Fingers crossed!

[@silentone11111111]

Great deep dive. Wonderful vid 😮

[@wd4005]

I have to say thank you. I have never been able to explain low probability of intercept very clearly but that short explanation I will now be light years ahead and can explain it in a very simple yet accurate manner. P.S. I love your videos they definitely help my teaching.

[@Kaizzer]

Super interesting!

[@ptsdon]

This is a very educational video on advanced radar for me. I am familiar with 5G advanced antenna systems. I read that these newer beam-forming and beam-steering antenna systems were developed from advanced radar technology. Now I have a much better idea as to why that is the case.

[@pareshprajapati7916]

Thank you sir 🇮🇳

[@atlet1]

Tank you! Can we see a clip about the Wegetail and Global eye soon? I miss information of the higher frequency span in the GaN tech and even the possibility to place more avionics directly in the element. I even want to know more about what properties are effected by the numbers of elements in an AESA and how distributed aperture of AESA's are effecting the radar performance.

[@keirfarnum6811]

Well Infantry Fighting Vehicle you! 👍🏻

[@hb1338]

There is plenty of information in the scientific and engineering journals relating to the design and construction of phased arrays, about fifty years worth.

[@jeffzanin5503]

Another excellent video on a very interestng topic.

[@veritypickle8471]

Thankings. Have interactions.

[@faf9144]

thanx a lot man serious and impresive data

[@teashea1]

most excellent - as always -------- ps. more robot

[@Intellistan]

Wonderful