San Antonio is one of the classes of vessels planned to receive the SSDS (ship self-defence system) mk2 being developed by Raytheon for the US Navy. SSDS will be an integration of all the ship's self-defence systems and will include multi-function radar, advanced integrated electronic warfare system and infrared search and track system (IRST).
LPD 22, the sixth of the class, is scheduled to be the first ship to receive the complete system,
which will be retrofitted to the rest of the class. SSDS is also to be fitted to the US Navy projected new carriers (CVN 76) and destroyers (DD-X).
The ship is equipped with a fibre-optic shipboard wide area network (SWAN) from Raytheon, which connects ship systems, sensors and combat systems to the ship’s command consoles.
In February 2004, Harris Corporation was awarded a contract to provide high-frequency (HF) radio broadband communications systems for the San Antonio Class.
The ship is equipped with the AN/SLQ-25A Nixie towed decoy system, from Argon ST of Fairfax, Virginia, and the Mk 53 Nulka decoy launching system, developed by the Australian Defence Science and Technology Organisation in Canberra and Lockheed Martin Sippican in Massachusetts.
Nulka is a hovering rocket system, which seduces incoming missiles away from the ship.
The Raytheon AN/SLQ-32A (V) 2 ESM (Electronic Support Measures) system is a detection and jamming system which provides surveillance, warning and electronic countermeasures against missile attack. LPD 22 and later vessels will be fitted with the advanced integrated electronic warfare system (AIEWS).
Sensors
The ship's radars include: ITT AN/SPS-48E three-dimensional air search radar operating at C/D band, Lockheed Martin AN/APQ-9B surface surveillance and tracking radar operating at I band, Raytheon AN/SPS-64(V)9 navigation radar operating at I band and two Northrop Grumman Norden Systems AN/SPS-73 surface search radar operating at I-band