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Functional Performance Specification for an External Computer System Simulator

Abstract : This document defines the functional and performance requirements for the external computer system (ECS) simulator that interfaces with the inertial navigation system simulator. Both the ECS simulator and the INS Inertial Navigation System simulator are being developed in Ada by the Real-Time Embedded Systems Testbed Project at the Software Engineering Institute. The ECS simulator is similar to a real-world ECS, but has reduced functionality. This document provides specifications for the major functions of the ECS simulator. In the real world the INS provides accurate information about ship position and motion on a time-critical basis to the ECS. The ECS interfaces with the INS and is capable of receiving and transmitting messages to the INS. The ECS also has functional requirements for providing information to launch controllers (such as missile guidance sets) and other shipboard systems. This document specifies the functional and timing requirements for the ECS simulator. Thus, this program is developed to interface with the INS simulator. However, the scope of this document is to present message processing functions and the operator interaction. Detailed processing, such as missile guidance set alignment, is not considered in this document.