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High Powered Microwaves Against Ships

HPM EMP

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#1 Josh

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Posted 11 October 2017 - 1727 PM

How effective would an HPM emitter be against a ship? On the one hand, I assume any radio or radar receivers would readily absorb HPM if it was within the antenna's bandwidth. On the other hand I'd expect the hull to largely shield anything inside the ship. Its also not clear to me what bandwidths HPMs operate at and whether they can be tuned to specific frequencies. I assume so, with limitations on power and size of the antenna?

#2 Josh

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Posted 11 October 2017 - 1728 PM

Also for civilian ships - I assume a non-metallic hull wouldn't offer much protection, while a metal super structure might?

#3 TTK Ciar

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Posted 13 October 2017 - 0038 AM

I wasted years of my youth racing dinghies (thistle class), and the fiberglass hulls were invisible to coast guard radar. I'd expect them to be transparent to microwaves as well.

#4 DougRichards

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Posted 13 October 2017 - 0408 AM

I wasted years of my youth racing dinghies (thistle class), and the fiberglass hulls were invisible to coast guard radar. I'd expect them to be transparent to microwaves as well.

 

But the crews may get cooked.............

 

Seriously...  wouldn't the inverse square rule come into effect?  Unless some kind of 'laser' microwave was developed: (hey, Star Trek: phaser perhaps?)



#5 Markus Becker

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Posted 13 October 2017 - 0536 AM

You mean the "death ray" looses power rapidly over distance?

#6 Josh

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Posted 13 October 2017 - 0824 AM

I wasted years of my youth racing dinghies (thistle class), and the fiberglass hulls were invisible to coast guard radar. I'd expect them to be transparent to microwaves as well.

 
But the crews may get cooked.............
 
Seriously...  wouldn't the inverse square rule come into effect?  Unless some kind of 'laser' microwave was developed: (hey, Star Trek: phaser perhaps?)


I was thinking of a missile mounted emitter like the CHAMP demonstrator.

Edited by Josh, 13 October 2017 - 0825 AM.


#7 Charles

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Posted 13 October 2017 - 1018 AM

The highest powered emitters used at sea are those used to guide missiles onto their targets. Lighting up another not so friendly nations naval vessel is seriously frowned upon (was in my day); unless you intend to launch missiles at them. Akin to pointing a loaded gun at someone, not very polite. 

Can these emitters do you harm?, yes they can. Standing too close (a few meters of the emitter) can lead to potential medical issues.

 

Actual frequencies etc I do not have to hand.

 

Charles



#8 JWB

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Posted 13 October 2017 - 1121 AM

http://hyperphysics....se/ems1.html#c1



#9 JWB

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Posted 13 October 2017 - 1123 AM

http://hyperphysics....se/mod3.html#c1



#10 TTK Ciar

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Posted 13 October 2017 - 2128 PM

Seriously...  wouldn't the inverse square rule come into effect?  Unless some kind of 'laser' microwave was developed


Yes, waveguides collimate microwaves quite effectively, which is how radar and wireless power transmission are possible in the first place.

Edited by TTK Ciar, 13 October 2017 - 2129 PM.


#11 DB

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Posted 15 October 2017 - 1210 PM

A "laser " microwave emitter came first - the MASER.

 

What sort of effect are you looking for, Josh? RF interference is quite possible, but warships should have adequate screening for data and discrete signals.

 

Composites can, of course, be screened by embedding metallic meshes

 

Cooking the crew seems unlikely. I understand that headaches and drowsiness come first if that's happening.



#12 Josh

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Posted 16 October 2017 - 0826 AM

CHAMP successfully cripled desktop computers (a much more fragile target to be sure). I was specifically wondering if a naval ship would suffer permanent damage to its radar receiver/emitter or possibly loss of radios or navigation.

Edited by Josh, 16 October 2017 - 0826 AM.


#13 sunday

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Posted 22 October 2017 - 0624 AM

Interesting thread on reddit

https://www.reddit.c...radar_kill_you/



#14 Mr King

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Posted 22 October 2017 - 1008 AM

I wish I could find it, there was an article linked on reddit to an aerospace blog discussing speculation that the US had deployed microwave weapons from aircraft against targets in places like Libya and Syria.  






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