depth to copy or transmit message
traffic,” he said.
The Navy issued a request for
proposals for CSD Increment 1 April
9 and expects to award a development contract Sept. 15. However, it
already has tested two CSD technologies under the program segment known as Increment 0.
In December, the Harry S.
Truman carrier strike group successfully tested a two-way data
exchange between a submarine’s
standard towed communications
antenna and surface ships using
High-Frequency Internet Protocol
(HFIP). HFIP provides extended
line-of-sight, low-bandwidth, high-frequency networking capability in
support of maritime domain awareness, according to Steven Davis,
spokesman for the Navy’s Space and
Naval Warfare Systems Command.
The second system being evaluated under Increment 0 is a tactical
paging system — Deep Siren —
developed by Raytheon with its own
funds. Deep Siren combines existing
technologies — active sonobuoys,
underwater acoustic communications and global satellite
communications — to transmit small packages of data,
such as mission tasking, tracking assignments or other
mission information, one way through the water to a
When dropped into the sea by ship or aircraft or
launched by submarine, the Deep Siren Tactical Paging
Buoy activates and establishes a link via an Iridium
satellite to a fleet communications facility. When a
commander sends a message, it is linked to the buoy,
which has a 30-minute total transmission life and can
rest at low power for three days when not actively
The message is encoded by the buoy in the system’s
acoustic communications protocol and transmitted to the
submarine via a multi-element active acoustic projector
system suspended at a depth reasonable for long-range
transmission. The submarine receives the message with
its onboard sensors, and it is then decoded and presented
on a display.
Deep Siren first was demonstrated in the Rim-of-the-Pacific Exercise 2006.
“The buoy and the acoustics demonstrated significant potential but were hindered by an unreliable submarine launch package,” Starr said.
The attack submarine USS Miami steams through the Arabian Sea accompanied
by the aircraft carrier USS Enterprise, Military Sealift Command fast combat
support ship USNS Supply and the guided-missile cruiser USS Gettysburg in
November. The Navy is testing technologies that it hopes will enable submerged
submarines to attain responsive tactical communications with surface ships.
Deep Siren was selected in 2007 after submission in
response to a request for proposals for a tactical paging
buoy “that could meet aggressive requirements for
acoustic range, data rate and limited detectability,” he said.
Raytheon was awarded a $5.2 million contract to
demonstrate Deep Siren, according to Bill Matzelevich,
senior manager of business development for Raytheon
Network Centric Systems, McKinney, Texas. Raytheon’s
partners in the program are Ultra Electronics Maritime
Systems of Dartmouth, Nova Scotia, Canada, and RRK
Technologies Ltd. of Glasgow, Scotland.
In mid-March, the Deep Siren acoustic protocol was
tested, followed by extensive testing from a research
vessel at a Navy test range.
“The over-the-side and acoustic testing returned
positive results, with acoustic reception greater than
20 nautical miles,” Starr said.
A submarine launch demonstration was scheduled for
late June, and an at-sea demonstration of launch and performance in several submarine scenarios is slated for late
August. Test results will be evaluated for a planned follow-on military utility assessment conduced by the Navy’s
Operational Test and Evaluation Force.
Matzelevich said that Raytheon was concentrating
on ensuring a robust Deep Siren system.