India makes headway with ELF (Extremely Low-Frequency) site construction

[CarbonD]

India makes headway with ELF site construction
By James Hardy

3/4/2013

Imagery taken by DigitalGlobe in January 2013 provides an update on the construction of India's new Extremely Low-Frequency (ELF) facility in the south of the country.

The construction began in March 2012, when Admiral Nirmal Verma, chief of the naval staff of the Indian Navy (IN), laid the cornerstone for the ELF facility near the village of Vijaya Narayanam, about 23 km north of the Kudankulam Nuclear Power Plant in Tamil Nadu. It is co-located with the IN's Very Low-Frequency (VLF) communications station, which transmits at 18.2 kHz.

The ELF station, which is believed to be being built by Indian firm Larsen & Toubro, will have nuclear-hardened bunkers and is expected to be commissioned in 2015. Russia is closely associated with the research and development for the facility, which is expected to be similar to Russia's own ELF transmitter at the ZEVS facility near Murmansk.

ELF transmission is used to communicate very brief commands to submerged submarines. Such transmissions can travel thousands of miles and through extended depths of seawater. ELF transmissions are generally initiated during circumstances in which conventional communications channels have been disrupted or destroyed.

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India makes headway with ELF site construction


Seems like India going for is Cold War era options.
these types of systems were used by the US and Russia and only they are the only two cou tries who use it as of today

 

[IndoUS]

More or less geared toward keeping the nuclear sub. in constant contact in case of an emergency.

 

[OrionHunter]

There's a huge problem in sub surface communications. Unfortunately it is just a one way street. A submerged sub can receive ELF transmissions but cannot transmit. And there's no voice communication due to narrow band widths. Due to the limited bandwidth, information can only be transmitted to the sub very slowly, on the order of a few characters per minute.

 

[rashtriya.rifles]

And peeps around said Arihant hasn't started it's defensive patrols

 

[Capt.Popeye]

More or less geared toward keeping the nuclear sub. in constant contact in case of an emergency.

And to pass the necessary commands during emergent times.

@OrionHunter, it is not exactly one way street. The submerged sub can transmit via a trailing antenna. Another means via Sat is also being worked on.

 

[OrionHunter]

And to pass the necessary commands during emergent times.

@OrionHunter, it is not exactly one way street. The submerged sub can transmit via a trailing antenna. Another means via Sat is also being worked on.

ELF [Extremely Low Frequency 30 Hz - 300 Hz 10,000 Km - 1,000 Km wavelength] is the only band that can penetrate hundreds of meters below the surface of the ocean. This band is used to send short coded "phonetic letter spelled out" (PLSO) messages to deeply submerged submarines that are trailing long antenna wires. The communication is only one way, therefore it is used primarily for prearranged signals or to direct the submarine to come closer to the surface for faster communications.

The US Navy is investing in new and previously demonstrated techniques for communicating with submarines at speed and depth for coordinated ASW operations. These techniques most commonly use either trailing wires or towed buoys for submarine communications, which impose limitations on the submarine's maneuverability and stealth, and therefore negatively impact the submarine's ability to fully conduct ASW operations.

Both missile and attack submarines in the U.S. Navy can receive messages via very low frequency radio waves, which can be picked up by a trailing wire antenna while they operate submerged. But they cannot transmit at these frequencies. The subs would need to transmit at normal frequencies through floating buoys which are above the surface.


However, an airborne laser which could penetrate shallow water would permit submarine communications without the restrictions of floating wires or buoys. But that's still some way into the future.

 

[Nisha]

Isn't there a new breakthru involving quantum codes?




First-ever secure quantum code transmitted through air




Quantum Cryptography: Privacy Through Uncertainty




Scientists Set New 'Quantum Teleportation' Record | News & Opinion | PCMag.com




I know or heard of CHina conducting similar research but I wonder if India has even looked into such research? It would great to know if India is conducting such research.

Oh yeah, another point, why the hell does our govt announce everything to the world? The premise of hardened bunkers, secret location, etc gets lost when we announce and leak such critical developments to the media. Come on......

 

[ptltejas]

only few countries succeeds to make ELF. when India do it some European countries who had failed jealous on us.

 

[MST]

There's a huge problem in sub surface communications. Unfortunately it is just a one way street. A submerged sub can receive ELF transmissions but cannot transmit. And there's no voice communication due to narrow band widths. Due to the limited bandwidth, information can only be transmitted to the sub very slowly, on the order of a few characters per minute.

But the only transmission we need to make on that channel is "Fire the Nukes"
I think for 3 words it should be fine.

 

[Nisha]

Any idea if India has done any research on quantum transportation?