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How accurate is an inter-continental nuclear bomb/missile from us.

Just a thought... From the land and the ones in Trident Submarine.

How accurate is GPS in detecting the position of your car?
Take that, plus some advanced military technology and you got your answer.

+- a few yards. Probably better than that.

quote:

Originally posted by Meat187 How accurate is GPS in detecting the position of your car? Take that, plus some advanced military technology and you got your answer.

Winning response, pretty much.

CEP on Trident D5 is about ~100m at max range (11,300Km).

That means that 50% of its warheads will fall within ~100m of its target.

Considering that the ones with the W88 warheads have a yield of 475Kt thats pretty much over kill.

Trident actually doesn't use GPS. It uses INS+Star Sighting (the guidance system has a camera that basically knows what the stars should look like at points in its trajectory, and it then adjusts the flight path till it matches the stars, sort of like TERCOM in the Tomahawk).

There has been tests with GPS systems, but they are not deployed. INS+Star Sighting is usually a more reliable choice because GPS can be jammed, destroyed, etc.

What really is the kicker is that these missiles are launched from Submarines, moving platforms, and can hit that accurately.

Actually another interesting thing is that most people think JDAM (the guidance kits attached to older iron "dumb" bombs) is GPS guided.

It is actually INS (inertial) guided with GPS updates to increase accuracy.

JDAM can be dropped and hit roughly with the same accuracy with or without GPS.

Oh, didn't see you asked about land too. Minuteman III is pretty much as accurate as the Trident D5.

quote:

Originally posted by Joss Weatherby (the guidance system has a camera that basically knows what the stars should look like at points in its trajectory, and it then adjusts the flight path till it matches the stars

Seriously?

quote:

Originally posted by Sushipunk Seriously?

Yes.

http://www.evaluationengineering.co...tem-part-1.html

quote:

Although the preceding capability provides considerable navigation accuracy, additional accuracy is achieved through a stellar sighting performed midway through flight. Using a charge coupled device (CCD) mounted on the stable member, the system sights a star and performs a navigation update to remove any uncertainty in the system�s initial conditions and thereby further increasing the accuracy of the overall system.

As Nou said, there are a lot of different systems:

http://en.wikipedia.org/wiki/Missile_guidance

You can be extremely accurate, but when throwing a nuke robustness is obviously more important than hitting within a few meters of your target.

GPS is obviously not used from submarines because there's no signal down there.

Nuclear weapons do not have to be accurate...

Actually just realized what I think the term "spinning up" means when they go through the launch procedures in a submarines. I assume this period is the subs INS navigation system initializing and "spinning up" the gyros in the guidance systems on the missiles. This, I assume, is pretty much the same as initializing the INS system on aircraft, and takes a few minutes.

INS is pretty awesome, its amazing how accurate these systems can be with absolutely no outside help.

quote:

Originally posted by VDub Nuclear weapons do not have to be accurate...

Actually, they do. Busting silos, which is what Trident would be best at, does require accuracy.

The Soviets made up for this issue with numbers. They planned to put 2-3 warheads down per silo, ground bursts, in the 700 to 1000 kiloton range. There are a lot of Silos in Montana, North Dakota, South Dakota, Colorado, and Wyoming... and there used to be a lot more back then (including in Arizona, Arkansas, and a few other states).

quote:

Originally posted by Joss Weatherby INS is pretty awesome, its amazing how accurate these systems can be with absolutely no outside help.

Fun fact: one of the most accurate and robust navigation system known to mankind is actually the homing pigeon.
I find that even more amazing. Something that eats bread thrown by old people in parks beats all the fancy science.

quote:

Originally posted by Meat187 Fun fact: one of the most accurate and robust navigation system known to mankind is actually the homing pigeon. I find that even more amazing. Something that eats bread thrown by old people in parks beats all the fancy science.

So you're proposing that they build a little pigeon cockpit in these missiles???

quote:

Originally posted by Meat187 Fun fact: one of the most accurate and robust navigation system known to mankind is actually the homing pigeon. I find that even more amazing. Something that eats bread thrown by old people in parks beats all the fancy science.

Yea, I read a long time ago that some birds are able to sense magnetic north, like they actually... "see" north and have constant reference point in that direction at all times. I guess they are able to figure out how to translate places on the globe so they know they are traveling back to where they started from. Amazing.

quote:

Originally posted by VDub So you're proposing that they build a little pigeon cockpit in these missiles???

Actually.... http://en.wikipedia.org/wiki/Project_Pigeon

quote:

Originally posted by Joss Weatherby Actually.... http://en.wikipedia.org/wiki/Project_Pigeon

Haha!!!

Brilliant...

There's a new movie out on Netflix right now called "Shock & Awe". It features a ton of info on this subject, mostly regarding JDAMS and Tomahawk missiles and their guidance systems.

quote:

Originally posted by VDub Nuclear weapons do not have to be accurate...

True. When the Americans bombed Hiroshima, the bomb was supposed to hit Paris.

Just a minor mistake.

Explain me about the iraq war. They used all these lazer guided and DPS guided missles to bombard them. THe reports came back that over 80% of their missiles missed, but don't quote me on that. It's all but a memory.

Answer me this. How fast can a super power (China, GB, Russia, US) decide to annihilate someone, even if it's against the rules of war. Deploying their air force and navy.

5, 4, 3, 2, FFFFFFFFUUUUUUUUUUUUUUUUUUUU

quote:

Originally posted by knowhope Explain me about the iraq war. They used all these lazer guided and DPS guided missles to bombard them. THe reports came back that over 80% of their missiles missed, but don't quote me on that. It's all but a memory.

Where are you getting these numbers?

quote:

Originally posted by knowhope Answer me this. How fast can a super power (China, GB, Russia, US) decide to annihilate someone, even if it's against the rules of war. Deploying their air force and navy.

The US and Russia could destroy each other, and a good chunk of the rest of the world in about 40 minutes. Ten minutes to make the decision, ten to thirty for missiles to reach their targets.

All the other nuclear powers combined do not have enough warheads to do the same really.

China has less nuclear weapons than Israel by most accounts (~200 vs. ~400).

Two Ohio class ballistic missile subs could level enough destruction on China in 10 minutes to reach Dr. Herman Khan's definition of a country being "destroyed".

Like i said, don't quote me. I just remember a report from the news.

Well that answers everything on spot.

Thread complete!

lol bush with a codpiece

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