Military Forum for Russian and Global Defence Issues
BTW Mindstorm can you tell me why the RV from ICBM are so slow once they enter into the atmosphere ?
What speed it is in few km above the earth and isnt it easy to intercept such slow RV ?
), the perspective illusion that generate this false impression of .....slow speed 
....is the same in play when you see a very distant aircraft traveling ,apparently, of few meters at second in the air 
BTW Mindstorm can you tell me why the RV from ICBM are so slow once they enter into the atmosphere ? Austin Thu Jan 31, 2013 2:55 pm
ahmedfire wrote:Very fast , Between 7.5 and 9.5 km/s depending on atmospheric entry angle and certain individual boost phase parameters,
That's why the best idea is to destroy the missile during boost phase when it was still quite slow.
many ABM systems ,S-500 as example is ABM and LEO ASAT system .
Anas Ali wrote:ahmedfire wrote:Very fast , Between 7.5 and 9.5 km/s depending on atmospheric entry angle and certain individual boost phase parameters,
That's why the best idea is to destroy the missile during boost phase when it was still quite slow.
many ABM systems ,S-500 as example is ABM and LEO ASAT system .
what is LEO ASAT ?
Anas Ali wrote:
what is the speed of the RV'S (reentry vehicle) and what is the RCS of it ?
is there away to defend against a RV ?
marcinko wrote:I mean you have mobile Topol M - is this assigned a particular target - say Chicago or NORAD - and it has most data preloaded and it`s ready to launch ?
Is there a fluid way to select which missile gets what target ?
Morpheus Eberhardt wrote:The missile itself calculates the trajectories for each reentry vehicle.
jhelb wrote:Morpheus Eberhardt wrote:The missile itself calculates the trajectories for each reentry vehicle.
Can you expand on this please.
GarryB wrote:Think of it as artillery... which is also ballistic.
It needs to know its current position and orientation and the location of the target and from that it can calculate the direction and angle it needs to direct the shell to make it impact on the target.
Obviously with ICBMs there are other aspects to consider like the earth rotation during the period of flight as well as the effects of side winds at launch and reentry, but most errors can be compensated for by having a manouvering warhead...
As far as I'm aware, all ICBMs and SLBMs have inertial guidance systems as a backup, if not the primary targeting system. Knocking out satnav arrays will reduce accuracy, but the warhead can always be dialed up to compensate with a larger explosion.jhelb wrote:Garry, hypothetical situation, but suppose after a Russian ICBM/SLBM is launched,somehow the US/NATO manages to cut off the GLONASS signals that the missile is receiving. How will the missile then zero in on the target?
jhelb wrote:Garry, hypothetical situation, but suppose after a Russian ICBM/SLBM is launched,somehow the US/NATO manages to cut off the GLONASS signals that the missile is receiving. How will the missile then zero in on the target?
artjomh wrote:Astro-intertial correction.
Ballistic missiles literally navigate by stars.
Also, remember that ballistic missiles are not like cruise missiles, they have a pretty short powered flight. You "aim" a ballistic missile during its boost phase, and after it reaches apogee, it corrects its orientation with small maneuvering verniers using astrocorrection. After which it does not "fly" in a same sense that a plane flies. It just falls on target like an artillery shell.
GarryB wrote:Can I add that as artjomh points out with the short flight time... a modern ring laser gyro uses a very very long fibre optic cable with a laser beam flowing through it to measure movement. Modern examples are so sensitive they can measure the effect of the earths rotation while sitting still on a table.
artjomh wrote:The peace dividend produced as a result of the end of the Cold War meant that many programs were cancelled as money was funnelled away from military programmes (e.g. Fast Hawk).
Further attempts to create a US response to supersonic cruise missile threat (HyFly, JSSCM/SHOC, the RATTLRS programme, as well as LRASM-B) were also cancelled due to budget sequestrations.
jhelb wrote:artjomh wrote:The peace dividend produced as a result of the end of the Cold War meant that many programs were cancelled as money was funnelled away from military programmes (e.g. Fast Hawk).
Further attempts to create a US response to supersonic cruise missile threat (HyFly, JSSCM/SHOC, the RATTLRS programme, as well as LRASM-B) were also cancelled due to budget sequestrations.
Artjomh, during the days of the Cold War (or for that matter,even now) was it possible for USSR or NATO to determine if an incoming ICBM/SLBM is carrying a nuclear warhead or a conventional(non-nuclear) warhead? Thanks.
artjomh wrote:No, of course not.
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