this post was submitted on 03 Jan 2024
1059 points (98.2% liked)

World News

39032 readers
2283 users here now

A community for discussing events around the World

Rules:

Similarly, if you see posts along these lines, do not engage. Report them, block them, and live a happier life than they do. We see too many slapfights that boil down to "Mom! He's bugging me!" and "I'm not touching you!" Going forward, slapfights will result in removed comments and temp bans to cool off.

We ask that the users report any comment or post that violate the rules, to use critical thinking when reading, posting or commenting. Users that post off-topic spam, advocate violence, have multiple comments or posts removed, weaponize reports or violate the code of conduct will be banned.

All posts and comments will be reviewed on a case-by-case basis. This means that some content that violates the rules may be allowed, while other content that does not violate the rules may be removed. The moderators retain the right to remove any content and ban users.


Lemmy World Partners

News !news@lemmy.world

Politics !politics@lemmy.world

World Politics !globalpolitics@lemmy.world


Recommendations

For Firefox users, there is media bias / propaganda / fact check plugin.

https://addons.mozilla.org/en-US/firefox/addon/media-bias-fact-check/

founded 1 year ago
MODERATORS
 

Ukraine plinking a Russian GPS-jammer with a GPS-guided bomb. Ukrainian drones blowing up Russian drone-jammers. Ukraine’s cruise missiles striking Russian air-defense sites whose missions include, you guessed it, shooting down cruise missiles.

Russia’s 23-month wider war on Ukraine has seen a lot of ironic, darkly-hilarious clashes. The latest was also one of the quickest between setup and punchline.

On Tuesday morning, Russian media announced the deployment, to Ukraine, of Russian forces’ latest high-tech counterbattery radar. A few hours later in southern Ukraine, the Ukrainians blew it up ... with artillery rockets.

The irony deepens. In theory, a Russian Yastreb-AV radar would help to protect Russian troops from Ukraine’s American-made High-Mobility Artillery Rocket Systems launchers—its HIMARS. Now guess what the Ukrainians used to destroy that first Yastreb-AV.

That’s right: HIMARS.

you are viewing a single comment's thread
view the rest of the comments
[–] tpyo@lemmy.world 7 points 10 months ago (3 children)

This was an interesting conversation to follow, but I got lost on the acronyms. Could you expand those please? TIA (thanks in advance)!

[–] Passerby6497@lemmy.world 4 points 10 months ago

Just taking some guesses based on a minute of googling:

digital AESAs

digital active electronically scanned array (AESA)

LPD operation

Low Probability of Detection operations

[–] Socsa@sh.itjust.works 2 points 10 months ago

So normal radar is like a lightbulb. You can tell where it is from any direction. The right kind of AESA is like a laser. You have to more or less be right in the path to detect it, and you have to detect it to locate it.

[–] Rednax@lemmy.world 1 points 10 months ago

You can look up what the acronym AESA means without unstanding it.

Take two speakers that are next to each other. If they emit a tone of the same frequency, the sound will "add up" and be louder in some directions, and cancel out to some degree in others.

A phased array radar uses the same concept, but now on electro magnectic waves, instead of sound waves. And with much more than just 2 emitters. By carefully choosing the phase of the signal in each emitter, itnis possible to both choose a single direction that receives the strongest signal, and to tighten the spread around that direction (creating a pencil beam). This is what the dish is for in standard radars.

If these phases can be fully controlled electronically, you can steer where you are looking, and swap between wide and narrow search beams in an instant. However, that is not a trivial thing to produce. So cheaper phased array radars use mechanical systems, or partial electronic steering (example: only horizontal steering).