OSM is a distributed data acquisition and control system which is comprised of a main controller and one or more satellite interface modules. The components communicate over a dedicated Fast Ethernet

The Onboard Signature Manager (OSM) is the control system for the Sea Water Injection (SWI) and Active Hull Cooling (AHC) systems. OSM is a turn-key wall mounted unit with local user operation via flat screen graphical display.

OSM interfaces the following main systems:

• The Active Hull Cooling (AHC) water flow control components;

• The ambient environment sensors;

• The ship machinery control system;

• The network of ship skin surface temperature sensors; and

• The Sea Water Injection (SWI) water flow control components.

OSM performs the following main functions:

• Calculates the optimal ship skin temperature in order to minimize the susceptibility of the ship to IR guided missiles under current operating conditions;

• Automatically controls the flow of water to the ship skin to achieve the optimal skin temperature;

• Automatically controls the flow of water to SWI systems as a function of engine operating state;

• Ensures that water is distributed intelligently over the ship surface without exceeding pumping capacity;

• Graphically displays the status of the SWI and AHC systems;

• Maintains a log of all sensor and control data.

OSM can be software upgraded to perform the following functions:

• Calculate and display the total ship IR signature from all view angles around the ship for current operating conditions;

• Calculate and display an IR image of the ship and its background from an operator configured view azimuth and range; and

• Calculate and display the lock-on range to an IR guided missile for all azimuth angles around the ship for current operating conditions.