Architecture and functional decomposition of the SENSE function

Three functions (i.e., SENSE, PLAN, and EXECUTE) make up the essential functionality for the battle management/command, control, and communications element of the Global Protection Against Limited Strike system. This report focuses on issues related to the SENSE function to support the complexity management analysis of this element. In this analysis, a multilayered decomposition is developed from a high-level model. This model depicts energy from the environment as input and target vectors as output. This model can be decomposed into subfunctions, which are subsequently further decomposed. The hierarchy for three layers of decomposition is described. This structure provides a basis for careful analysis of essential properties (e.g., false alarms, missed detections).