SSDS
Encyclopedia
Ship's Self Defense System (SSDS) is an integrated weapons system used aboard large U.S. Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 ships, such as Nimitz class
Nimitz class aircraft carrier
The Nimitz-class supercarriers are a class of ten nuclear-powered aircraft carriers in service with the United States Navy. With an overall length of and full-load displacements of over 100,000 long tons, they are the largest capital ships in the world...

 supercarriers and various amphibious assault ships, such as LHD
Wasp class amphibious assault ship
The Wasp class is a class of Landing Helicopter Dock amphibious assault ships operated by the United States Navy. Based on the Tarawa class, with modifications to operate more advanced aircraft and landing craft, the Wasp class is capable of transporting almost the full strength of a United States...

s and LSD
Dock landing ship
A Dock landing ship or Landing ship is a form of amphibious warship designed to support amphibious operations. These amphibious assault ships transport and launch amphibious craft and vehicles with their crews and embarked personnel...

s. SSDS is an integrated combat direction system (CDS). SSDS follows an open architecture approach and uses existing shipboard radars and weapons systems, integrated under a COTS
Commercial off-the-shelf
In the United States, Commercially available Off-The-Shelf is a Federal Acquisition Regulation term defining a nondevelopmental item of supply that is both commercial and sold in substantial quantities in the commercial marketplace, and that can be procured or utilized under government contract...

 framework, to provide a cohesive CDS. The first SSDS designs were backfit onto existing U.S. Navy ships.

SSDS runs on current generation COTS, PC-based computers and has a core operating system of Linux
Linux
Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

, offering flexibility due to its COTS and open architecture
Open architecture
Open architecture is a type of computer architecture or software architecture that allows adding, upgrading and swapping components. For example, the IBM PC and Apple IIe have an open architecture, whereas the Apple IIc and Amiga 500 computers have a closed architecture...

 design.

Initial SSDS configurations were installed on LSD
Dock landing ship
A Dock landing ship or Landing ship is a form of amphibious warship designed to support amphibious operations. These amphibious assault ships transport and launch amphibious craft and vehicles with their crews and embarked personnel...

 amphibious ships and were designated Mk 1 (Mark One). Follow-on designs being installed on aircraft carriers and other amphibious ships are being called Mk 2, with different modification (MOD) numbers denoting the type on each class of ship.

Delivered and integrated with SSDS is the AN/USQ-T46 Battle Force Tactical Trainer (BFTT)
Battle Force Tactical Training
Battle Force Tactical Trainer, or BFTT , is a highly flexible, interactive single ship, group, or force level tactical combat system trainer...

, AN/USQ-T47 Battle Force Electronic Warfare Trainer (BEWT) and AN/USQ-T48 Tactical Simulator/Stimulator System (TSSS). BFTT is the Navy's premier shipboard combat system training system and brings an integrated single and multi-ship combat system training capability to the SSDS ship.
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