United States Navy (USN) : News & Discussions


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www.twz.com

Secretive Long Range Attack Missile For Marine AH-1s Is Now Being Flight Tested

The Long Range Attack Missile, based on an unknown Air Force weapon, will help ensure Marine AH-1Zs stay relevant in future high-end fights.
www.twz.com www.twz.com

Specific details about the LRAM's capabilities are limited, but the Marine Crops has said in the past that it will have a maximum range of at least 150 nautical miles (just over 170 miles or nearly 278 kilometers) and will be capable of engaging moving land and sea targets.
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Some interesting information on HALO (I think). Some interesting information on HALO (I think). 3,000m/s @ 25km altitude, that be Mach 10 (a little over Mach 1 = 298m/s at that altitude), 1,700m/s at S/L, that's Mach 5 at impact, ouch.

https://twitter.com/x/status/1789668290979082632

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randomradio said:
Star navigation of the yesteryears.
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Nope, far more accurate internal systems. This was recently brought up on secret projects, commercial RLGs can provide the same or better accuracy than GPS for munitions like GMLRS and GL-SDB now, the use of GPS is just a legacy of the era they were fielded in.
 
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BMD said:
Nope, far more accurate internal systems. This was recently brought up on secret projects, commercial RLGs can provide the same or better accuracy than GPS for munitions like GMLRS and GL-SDB now, the use of GPS is just a legacy of the era they were fielded in.
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The idea is RLGs and FOGs provide inertial navigation, and any drift is corrected by an external reference system like GPS.

But if GPS fails, a third backup is required, and that's typically astrometry.

Even GPS satellites are caliberated with lunar data.
 
randomradio said:
The idea is RLGs and FOGs provide inertial navigation, and any drift is corrected by an external reference system like GPS.

But if GPS fails, a third backup is required, and that's typically astrometry.

Even GPS satellites are caliberated with lunar data.
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Nope. The RLGs themselves can deliver accuracy of 0.0035deg/hour, which over a 150km, <10 minute flight for GLSDB works out to <1.5m error and probably less than half that for GMLRS. It's probably be even cheaper than GPS too, and unjammable.

tan (0.0035deg/hr) x 150,000m x (10/60)hrs = 1.5m

A 2S7 is 10.5m long and 3.4m wide, 1.5m off centre is still a direct hit.


And that's just a crappy $1000 commercial system. Even more accurate systems were produced even 40 years ago, they were just prohibitively expensive back then.

en.wikipedia.org

Advanced Inertial Reference Sphere - Wikipedia

en.wikipedia.org en.wikipedia.org
drift less than 1.5×10−5 °/h
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^That equates to only 1.8m over a 14,000km, 30 minute flight!

These days, within the budget of a hypersonic missile, you could likely spec. a system with similar accuracy for $100k.
 
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