Creative New

Via deagel , raytheon

Raytheon Company (NYSE: RTN) demonstrated the ability to communicate in real time with a submerged submarine at classified speeds and depths.
This capability, which addresses one of the most significant shortfalls in submarine communications, was exhibited for the United Kingdom’s Royal Navy during an at-sea trial of Raytheon’s Deep Siren Tactical Paging (DSTP) system.

The U.K. Ministry of Defence reported that Deep Siren demonstrated “the first step toward a transformational capability that will change the way we operate submarines in the future.”

The evaluation, which took place during the U.K. Royal Navy’s TAURUS 09 deployment, follows U.S. Navy testing conducted in 2008 that culminated with a successful military utility assessment.

Raytheon is also currently working on airborne certification of Deep Siren, which will allow the system’s buoys to be deployed via aircraft.

“The Deep Siren system is a vital command and control communications link that provides never-before available capability,” said Jerry Powlen, vice president, Network Centric Systems Integrated Communications Systems. “This system once again demonstrated its utility and reliability, proving that we are ready to move forward with production.”

The trial validated that DSTP system buoys can be used to communicate with submarines at underwater ranges significantly greater than 100 nautical (115 statute) miles. It also demonstrated that Deep Siren can significantly accelerate the process to communicate with a submarine by passing tactical messages between a commander and submarine in real time. The U.K. Royal Navy used Deep Siren to share contact information with a submarine, providing positions for both friendly and enemy forces.

Raytheon’s partners on the DSTP system are RRK Technologies, Ltd. and Ultra Electronics Maritime Systems.

 

 

Deep Siren Tactical Paging (DSTP) provides paging capability via acoustic, expendable buoys that, when contacted via an Iridium communications satellite, can send encoded tactical messages to submerged submarines.Acoustic messages can be sent at any time and received by the submarine without the need to come to periscope depth or deploy a towed antenna, both of which greatly impact the operational posture of the submarine.

 

The Deep Siren acoustic technology uses advanced digital-message processing to ensure submarine message receptions at tactical operating speeds and ranges greater than 50 nautical miles, depending on local topography. Buoy transducer depth can be optimally chosen to maximize performance as a function of thermal layers and acoustic propagation characteristics.Deep Siren uses digital signaling at low acoustic frequencies to achieve these capabilities.

 

Figure  shows the components of the DSTP system: command station, receive station,and Deep Siren expendable buoy. The portability of the command station enables deployment of Deep Siren in multiple tactical scenarios. In addition to being deployed from shore-based command centers, the command station may be utilized from a surface ship or airborne platform, allowing deployed buoys to be called from anywhere in the world.

 

The buoy employs an Iridium satellite link for bi-directional worldwide communication over the Iridium satellite system. It can be deployed from a surface ship, airplane or from the submarine itself. The buoy is deployed from a submarine through the trash disposal unit using a submarine launch vehicle (SLV). It is pre-programmed, prior to launch, with a message to be sent back to the base station upon deployment. Once the SLV reaches its pre-programmed depth, a float mechanism is deployed. The buoy separates from the SLV and ascends to the surface.

 

After the initial communication link is established, the buoy stays in standby mode for up to three days while waiting for reception of a command via satellite, instructing it to send a message acoustically.It features two hours of Iridium transmission time and one hour of full-power acoustic transmission time. The acoustic transducer depth setting is preconfigured for optimal range. The buoy pays out its lower electronics unit with the acoustic transducers to the preconfigured depth.