(U) THIS PAPER DESCRIBES A MULTISENSOR SURVEILLANCE SYSTEM (M4S) PROGRAM TO TRANSITION MATURE SENSOR AND DATA FUSION TECHNOLOGY INTO EXISTING AND/OF NEAR FUTURE AIRBORNE SURVEILLANCE PLATFORMS. THE PAPER DESCRIBES THE DATA FUSION CONCEPTS, ARCHITECTURE, AND ALGORITHMS THAT HAVE BEEN DESIGNED AND DEMONSTRATED. THE ARCHITECTURE SELECTED IS A DISTRIBUTED DESIGN IN WHICH EACH ONBOARD SENSOR SUBSYSTEM IS EQUIPPED WITH A SINGLE SENSOR TRACKING UNIT. SCAN-TO-SCAN OR FRAME-TO-FRAME CORRELATION IS BASICALLY RESOPVED ...