Pralay : New missile in development

[Olaf One-Brow]

How deep would subs need to be in order to communicate effectively with satellites?

Depends on what you're using to communicate with. VLF signals will only go down about 20m in water, so you're sub's downlink needs to be pretty damn close to the surface to receive signals from a VLF array. Any they can't transmit signals back due to size limitations.

I mean, good luck putting this on a submarine.

Rather then surface to near surface waters to receive signals, submarines will float a cable to that depth instead.

You generally aren't going to launch expendables, like a buoy (this one is an emergency beacon).

For UHF, those will penetrate greater distances and rather then VLF, UHF is generally used by satellites to communicate with submarines. Being hyper directional, only the recipient of the communications is going to receive it, so these types of satellite comms are very secure as well. Also they're encrypted.

ELF will go down hundreds of meters, but their arrays are massive and their wavelength 1/4 the diameter of Earth.

But how long is a typical radio buoy cable?

Could be meters. Could be kilometers. Same with your towed sonar cable.

How deep would subs need to be in order to communicate effectively with satellites? And does the transmission capabilities (in the required frequencies) exist with our present or future sats?

The SSIXS satellite system used by the USN is for communications with all USN assets, submarines included.

Currently a mix of FLTSATCOM

UFO

And their replacement MUOS are forming the USN's communications capability.

If India can talk to its ships, it can talk to its submarines using the same assets. VLF and UHF are still used, but ELF arrays are large and largely obsolete.

 

[Kinetic]

Depends on what you're using to communicate with. VLF signals will only go down about 20m in water, so you're sub's downlink needs to be pretty damn close to the surface to receive signals from a VLF array. Any they can't transmit signals back due to size limitations.

I mean, good luck putting this on a submarine.

Rather then surface to near surface waters to receive signals, submarines will float a cable to that depth instead.

You generally aren't going to launch expendables, like a buoy (this one is an emergency beacon).

For UHF, those will penetrate greater distances and rather then VLF, UHF is generally used by satellites to communicate with submarines. Being hyper directional, only the recipient of the communications is going to receive it, so these types of satellite comms are very secure as well. Also they're encrypted.

ELF will go down hundreds of meters, but their arrays are massive and their wavelength 1/4 the diameter of Earth.



Could be meters. Could be kilometers. Same with your towed sonar cable.



The SSIXS satellite system used by the USN is for communications with all USN assets, submarines included.

Currently a mix of FLTSATCOM


UFO



And their replacement MUOS are forming the USN's communications capability.

If India can talk to its ships, it can talk to its submarines using the same assets. VLF and UHF are still used, but ELF arrays are large and largely obsolete.

Indian Navy satellite GSAT-7 operating in UHF, S, C and Ku-bands can communicate with submarine.

GSAT-7 is an advanced communication satellite built by ISRO to provide wide range of service spectrum from low bit rate voice to high bit rate data communication. GSAT-7 Communication payload is designed to provide communication capabilities to users over a wide oceanic region including the Indian land-mass.
http://www.isro.gov.in/Spacecraft/gsat-7

 

[Indx-techs]

Pralay seems to be an advanced guided form off Shaurya as per this (and sorry for opening old thread.

 

[Surya 1]

200 MT? Thats like 4 times the Tsar Bomba.

200 kt is as far as India can scale up what she has in arsenal right now.

People says 350 and 2.5 MT also. When we tested H bomb in 1998, it was a scalled down version of 200 KT bomb and vajpayee had said that India had a capability to make big bomb way then. We have planned 1 MT and 3 MT bombs also.

 

[Nilgiri]

People says 350 and 2.5 MT also. When we tested H bomb in 1998, it was a scalled down version of 200 KT bomb and vajpayee had said that India had a capability to make big bomb way then. We have planned 1 MT and 3 MT bombs also.

200 kt serves the purpose quite well. Having 6 x 200 kt for example covers much more destructive area than one large 1.2 MT bomb.

 

[Surya 1]

200 kt serves the purpose quite well. Having 6 x 200 kt for example covers much more destructive area than one large 1.2 MT bomb.

Yes you are right but we need to have big bombs to work as deterrence. If china has targeted India with MT scale bomb (Looking highly doubtful looking at chinese BS nuclear technology), We must have equal or bigger scale bomb.