Live data from Hacker News

Czech Passive Radar Detecting B-2 at 150 miles (2015)

defence-blog.com

71–80 of 125 posts

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#71
A lot of countries posses radar that can detect stealth aircraft in a certain area, but cannot be used to create a fire solution or even narrowing it down to an area more than a couple square miles.

I believe as a design tradeoff, these planes are much more "invisible" (lower radar cross section) at tracking and targeting radar wavelengths, which must use much smaller frequencies.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#72

What's the mission and purpose of the B-2 these days? It's a penetrating strategic bomber. The justification for it was that it could strike mobile Soviet ICBM launchers. It was never going to be any good for that. What's it for now? Has it ever been used against a sophisticated enemy (i.e. not people who are literally living in caves)?

It's combat debut was during the Kosovo War, which was clearly _not_ people who are literally living in caves, during which the F-117 suffered its only combat loss, shot down by anti-aircraft missiles, successfully tracked by the radar.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#73
Who wrote that article? It reads like Chinese that was put through a bad version of google translate.

I mean really who uses 'cum' in an official article (even though it's not in an NSFW context and technically used correctly). It's a word that has fallen into disuse because its 'other' use has taken over its association entirely :) You won't find this in a serious publication.

And this "Distance reconnaissance: 400 km with 20 m wrong; Number of goals can stick to 200 targets simultaneously."

Whatever it is, this ain't English.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#74
post #55

Earlier quoted context omitted.

Could the adversary still just send cannon equipped fighters to the general that would locate the stealth bomber visually and shoot it to pieces ? Sure, could be rather hard to do in the night but once a stealth bomber is sighted visually, it is toast - B2 simply has no self defence weapons available at all. A stealth fighter could be better off if it can defend itself while still avoiding others getting a weapon loc…

There is no way a B2 will be deployed without at least a couple fighters escorting it.

If it has fighters escorting it then it is not invisible.... whole point of B2s is to be invisible to long range radars (due to plane geometry). F22 and F35 don’t have this capability.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#75
post #29

Earlier quoted context omitted.

It could happen: https://en.wikipedia.org/wiki/Chicken_gun

In that vein: cold-war era chicken-heated nuclear bomb (for area denial) https://en.wikipedia.org/wiki/Blue_Peacock#Chicken_power

Oh dear.... Never heard of this but I'm glad the cold war is over.

"Alright chaps, let's bury some 10 kiloton nuclear mines in Germany in case the Russians come.", From wikipedia: "deny occupation of the area to an enemy for an appreciable time due to contamination"

"It was judged that the risks posed by the nuclear fallout and the political aspects of preparing for destruction and contamination of allied territory were too high to justify. "

Ummmmmm yeah WOULD YOU THINK???

"One particularly remarkable proposal suggested that live chickens be included in the mechanism. The chickens would be sealed inside the casing, with a supply of food and water; they would remain alive for a week or so. Their body heat would, it seems, have been sufficient to keep the mine's components at a working temperature."

Ok...... Now I'm really wondering if the Soviets were the crazy ones.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#76
post #55
post #42

Many people fail to understand that there's a huge difference between detecting the presence of an aircraft and actually targeting it. Anti-aircraft weapons must be precisely targeted to have any chance of hitting. So a passive radar can be useful in limited circumstances for cueing other sensors but it can't accomplish much by itself.

Could the adversary still just send cannon equipped fighters to the general that would locate the stealth bomber visually and shoot it to pieces ? Sure, could be rather hard to do in the night but once a stealth bomber is sighted visually, it is toast - B2 simply has no self defence weapons available at all. A stealth fighter could be better off if it can defend itself while still avoiding others getting a weapon loc…

That's the type of tactic that mostly only works in movies. In the real world interception is very, very hard just due to geometry. Fighters have limited fuel supplies and don't move much faster than bombers. Any no country can afford to keep a lot of them in the air or even on alert status at any given time. So the circumstances have to line up pretty well to get an interceptor in the right place at the right time.

And even then, aircraft like the B-2 are difficult targets to actually hit. At high altitudes they are fairly maneuverable due to low wing loading.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#77

Who wrote that article? It reads like Chinese that was put through a bad version of google translate. I mean really who uses 'cum' in an official article (even though it's not in an NSFW context and technically used correctly). It's a word that has fallen into disuse because its 'other' use has taken over its association entirely :) You won't find this in a serious publication. And this "Distance reconnaissance: 400…

cum qa become remains in common use today.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#78

What's the mission and purpose of the B-2 these days? It's a penetrating strategic bomber. The justification for it was that it could strike mobile Soviet ICBM launchers. It was never going to be any good for that. What's it for now? Has it ever been used against a sophisticated enemy (i.e. not people who are literally living in caves)?

It's combat debut was during the Kosovo War, which was clearly _not_ people who are literally living in caves, during which the F-117 suffered its only combat loss, shot down by anti-aircraft missiles, successfully tracked by the radar.

OK, but what's it good for today? Kosovo was 20 years ago. If the B-2's role is to fly conventional missions, the MQ-9 can be armed with the same weapons that the B-2 carries.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#79
post #42

Many people fail to understand that there's a huge difference between detecting the presence of an aircraft and actually targeting it. Anti-aircraft weapons must be precisely targeted to have any chance of hitting. So a passive radar can be useful in limited circumstances for cueing other sensors but it can't accomplish much by itself.

Stealth bombers aren't going to dodge missiles. They need to reach their target before they are noticed at all. Otherwise the enemy will mount a response and intercept the bomber.

That is not realistic. In most circumstances the enemy won't have any defensive assets in the right place at the right time in order to generate an intercept.

It's sort of like if you're deer hunting and spot one through binoculars a mile from you moving away. You're going to have to get really lucky to take that deer.

Re: Czech Passive Radar Detecting B-2 at 150 miles (2015)

#80

Who wrote that article? It reads like Chinese that was put through a bad version of google translate. I mean really who uses 'cum' in an official article (even though it's not in an NSFW context and technically used correctly). It's a word that has fallen into disuse because its 'other' use has taken over its association entirely :) You won't find this in a serious publication. And this "Distance reconnaissance: 400…

cum qa become remains in common use today.

I really haven't seen it in that context for the last 15 years or so :) Maybe it's just me :)

But really the whole article reeks of Engrish, it's not just that.

Post reply on HN