SPY-5 radar scans new horizons

Richard Scott

Wednesday, 9 September, 2009

Raytheon Integrated Defense Systems (Stand 1555) has lifted the veil on its new AN/SPY-5 phased array X-band multifunction radar, developed as a single sensor capable of providing horizon search, threat illumination and missile guidance/homing support.

The system – targeted at smaller surface combatants and large-deck amphibious ships and carriers requiring an improved self-defence capability – has been engineered to match the capabilities of the semiactive radar-guided Evolved SeaSparrow Missile (ESSM) system. An engineering development model (EDM), built using private venture funding, is now beginning test and evaluation.

Raytheon’s technical approach for SPY-5 combines the proven Mk 73 Mod 3 2kW solid-state transmitter system and associated Mk 30 radar processor below-deck with a new phased array lens antenna system, the latter employing patented phase shifter technology, to allow the instantaneous electronic beam steering. With each array face providing 120° field of view, full hemispheric coverage can be provided with either three or four surfaces to enable multi-target tracking and fire control.

Raytheon cites several benefits. For example, the arrays require less power and weigh far less than rotating radars and individual fire control directors, enabling SPY-5’s fixed phased-array to be flexibly located on the upper deck or mast. Simultaneous tracking and illumination of both air and surface targets, combined with support for both missile and surface gunfire control, alleviates the need for multiple radars.

In addition, SPY-5 provides improved defensive fire power for the combatant, with each array face capable of supporting multiple simultaneous engagements. Additionally, SPY-5’s range, accuracy and beam agility are designed to maximise ESSM’s performance envelope, while operation in the X-band optimises performance in the littoral maritime environment.

A dual-face EDM model has been installed at Raytheon’s test site at Portsmouth, Rhode Island, and radiated for the first time in July. This will initially be used for performance characterisation, to be followed by integration testing with ESSM and the NATO SeaSparrow Missile System. Officials say they are aiming to achieve full system qualification by the end of 2010.