Indian nuclear submarines

[warrior monk]

A look at the three trajectories MET , Lofted and Depressed with their CEP probabilities .

 

[sayareakd]

K15 is wave maker and k4 wont be different, just bigger and long range one. It does up and down. Difficult to predict where it is going.

 

[HariPrasad-1]

You have to balance the variables in testing in depressed trajectory the lift and drag force , re-entry heating , burnout parameters etc Once the vehicle has reached its pre determined apogee which will be lower than minimum energy trajectory the RV (Re entry vehicle ) trajectory now depends upon gravity . Now there are two ways for depressing trajectory is to depress the trajectory early in boost phase by turning the missile through a larger angle . This difference in angle will be accentuated by the effect of gravity dependent bending the trajectories over the course of the flight this is known as symmetric . The other way is is to follow a standard MET trajectory until the missile reaches altitudes at which the atmosphere is rarefied then missile can then be turned to flatten the trajectory this is known as shaped trajectory. As far as K-15 is concerned it flied in a shaped trajectory like a hypersonic missile with apogee of 40 to 50 Kms extremely dangerous .
It cannot use MIRV in such low apogee shaped trajectory . I don't know about K-4 , when it will get MIRV then it will have to fly a symmetric gravity shaped trajectory with high burn out time for MIRV . Yes MIRV is tested in dummy warheads with same mass distribution and CG (Center of Gravity ) as the actual warhead .

Awesome very awesome. Pl elaborate more about RV which you claim that they are tested.

I think those MIRV might be powered one if larger geographical area is to be covered. Since they are not delivered from great height, they can not glide to a great distance like the MIRVs delivered from ballistic missiles.

Pl also enlighten is about symmetric gravity shaped trajectory with high burn out time.

Thanks in Advance.

 

[HariPrasad-1]

time to have ATV smiley like this

Sir,

I am unable to find my 2 threads.

1) LCA Tejas Vs Saab Gripen.
2) Invisible innovation and grass root changes in india.

Where are they?

 

[sayareakd]

Sir,

I am unable to find my 2 threads.

1) LCA Tejas Vs Saab Gripen.
2) Invisible innovation and grass root changes in india.

Where are they?

Sorry Hari, i am not tech guy here, this is just part time work.

 

[HariPrasad-1]

View attachment 8218View attachment 8218

A look at the three trajectories MET , Lofted and Depressed with their CEP probabilities .

We have struck near zero CEP in last test inspite of the trajectory being shaped. How is it possible to get such a high accuracy in this trajectory.

The reason may be its cruise missile like flight in terminal Phase.

What say?

 

[garg_bharat]

I think the test results are classified. The news report is unofficial. Near zero CEP may mean anything here.

I think there is no need to glorify a single weapon system. It is a good development; and I believe K4 is close to an operational role.

The sub and ships have become more important for nuclear second strike due to heavy space based surveillance. Land assets have become more vulnerable to first strike.

So yes, Arihant and similar boats will make a big difference.

 

[HariPrasad-1]

Sorry Hari, i am not tech guy here, this is just part time work.

Thanks,

TO whom should I ask?

 

[sayareakd]

We have struck near zero CEP in last test inspite of the trajectory being shaped. How is it possible to get such a high accuracy in this trajectory.

The reason may be its cruise missile like flight in terminal Phase.

What say?

hint: watch ISRO launches and look how it stay on course. :bounce:

Not that it has any connection with ISRO, just to show how they get course correction in real time.

 

[HariPrasad-1]

hint: watch ISRO launches and look how it stay on course. :bounce:

Last flight of GSLV was highly successful and satellite was inject in <50m on intended orbit . i.e Apogee and perigee.

 

[HariPrasad-1]

I think the test results are classified. The news report is unofficial. Near zero CEP may mean anything here.

I think there is no need to glorify a single weapon system. It is a good development; and I believe K4 is close to an operational role.

The sub and ships have become more important for nuclear second strike due to heavy space based surveillance. Land assets have become more vulnerable to first strike.

So yes, Arihant and similar boats will make a big difference.

No, I have heard of this near zero accuracy in K series numbers of time.

 

[Sakal Gharelu Ustad]

Sir,

I am unable to find my 2 threads.

1) LCA Tejas Vs Saab Gripen.
2) Invisible innovation and grass root changes in india.

Where are they?

@sayareakd

There was tech glitch and we lost threads and posts from one week.

 

[warrior monk]

I think those MIRV might be powered one if larger geographical area is to be covered. Since they are not delivered from great height, they can not glide to a great distance like the MIRVs delivered from ballistic missiles.

I don't know but I don't think they are going to increase the fuel mass to empty mass ratio of the boost glide control vehicle .

Pl also enlighten is about symmetric gravity shaped trajectory with high burn out time.

Gravity shaped is nothing but gravity turned trajectory where missile is turned in its early boost phase during the pitch maneuver guidance control in the open loop pre programmed phase and it accelerates to a pre programmed apogee balancing all the forces where the burn out occurs . Now DRDO is claiming very high CEP now this can occur where the closed loop guidance phase which controls the

1) Angle-of-attack
2) Flight path angle
3) Range angle
4 ) Missile axis orientation
5) Wind velocity vector
6 ) Inertial position vector of the missile
7 ) Earth rate vector
8) Co related velocity
etc etc
These can be controlled only when engine burn out has not happened . So for high CEP (It is in low double digits never near zero ) so the closed loop guidance control phase has to be in control for longer period of time to even have a modicum of good CEP . Here I an intelligently guessing they don't and won't reveal the parameters hell we don't even have a pic of K-4 .

We have struck near zero CEP in last test inspite of the trajectory being shaped. How is it possible to get such a high accuracy in this trajectory.

I think its an exaggeration that near zero CEP for a depressed trajectory flight profile . I don't know

The reason may be its cruise missile like flight in terminal Phase.

They did mention 3 d maneuver in K-4 which which suggests MaRV but I may be wrong so we should wait for more information.

 

[no smoking]

We have struck near zero CEP in last test inspite of the trajectory being shaped. How is it possible to get such a high accuracy in this trajectory.
The reason may be its cruise missile like flight in terminal Phase.
What say?

Generally, the CEP in this kind of test is always quite high. You are launching in a very familiar environment, all the things have been monitored day by day, from weather to gravity, magnetic, etc. Every external factor which may impair your CEP is minimized. At this stage, the quality of design is the major concern. The real CEP will be only found out in later operational stage.

 

[HariPrasad-1]

I don't know but I don't think they are going to increase the fuel mass to empty mass ratio of the boost glide control vehicle .



Gravity shaped is nothing but gravity turned trajectory where missile is turned in its early boost phase during the pitch maneuver guidance control in the open loop pre programmed phase and it accelerates to a pre programmed apogee balancing all the forces where the burn out occurs . Now DRDO is claiming very high CEP now this can occur where the closed loop guidance phase which controls the

1) Angle-of-attack
2) Flight path angle
3) Range angle
4 ) Missile axis orientation
5) Wind velocity vector
6 ) Inertial position vector of the missile
7 ) Earth rate vector
8) Co related velocity
etc etc
These can be controlled only when engine burn out has not happened . So for high CEP (It is in low double digits never near zero ) so the closed loop guidance control phase has to be in control for longer period of time to even have a modicum of good CEP . Here I an intelligently guessing they don't and won't reveal the parameters hell we don't even have a pic of K-4 .




I think its an exaggeration that near zero CEP for a depressed trajectory flight profile . I don't know



They did mention 3 d maneuver in K-4 which which suggests MaRV but I may be wrong so we should wait for more information.

Excellent analysis. Thank you for your elaborate answer.

 

[sayareakd]

Generally, the CEP in this kind of test is always quite high. You are launching in a very familiar environment, all the things have been monitored day by day, from weather to gravity, magnetic, etc. Every external factor which may impair your CEP is minimized. At this stage, the quality of design is the major concern. The real CEP will be only found out in later operational stage.

K series is all about control.

 

[Neeraj Mathur]

India Conducts Twin Secret Tests Of K-4 SLBM

India tested it's most ambitious weapon -- the K-4 submarine-launched long range ballistic missile -- twice last month. Top sources tell Livefist that the two tests, both conducted at less than ceiling range of 3,500 km were conducted at an undisclosed location in the south Bay of Bengal.

The two tests on March 7 and March 31 are understood to be the second and third tests of the K-4. The first test, the details of which remain shadowy, is understood to have beencarried out in March 2014. The K-4, a submarine-launched derivative of the Agni-III -- but a vastly different weapon, obviously -- was revealed first by my India Today colleague Sandeep Unnithan back in 2010. The lower range K-15 submarine-launched missile was launched in 2013.

The Indian government barely acknowledges the existence of the K-4, so nobody's expecting anything official from the DRDO or MoD on the lines of what they put out for literally every other weapon test, including the doddering Prithvis (that are up for a progressive phase out soon, but more on that later).

A big congratulations to the K-4 team!

http://www.livefistdefence.com/2016/04/india-conducts-twin-secret-tests-of-k-4.html

 

[sayareakd]

News is getting better and better.

India Today confirms that two K4 tests took place last month and both from ATV.

http://m.indiatoday.in/story/india-...lear-missile-developed-secretly/1/641609.html

 

[sayareakd]

This calls for celebration and old pic of wave gereration by chotia meiya long time back

 

[Superdefender]

News is getting better and better.

India Today confirms that two K4 tests took place last month and both from ATV.

http://m.indiatoday.in/story/india-...lear-missile-developed-secretly/1/641609.html

Yeah, I watched today at 1:30pm the special 15min. talks in Headlines Today while taking lunch. They were showing the lunch video of K-4 from underwater which takes place on 31st Mar. But unlike other SLBM, the video shows dual smoke release emits from K-4. I have not seen anything like that before.