题名: |
Intelligent Transportation Systems (ITS) Logical Architecture: Volume 1 |
关键词: |
Communication systems; Transportation systems; Context diagram; Output terminators; Data flow models; Graphical data; Functional specifications |
摘要: |
The Logical Architecture is based on a high level Computer Aided Systems Engineering (CASE) model of the functional requirements for the flow of data and control through the Intelligent Transportation System (ITS). Structured Data Flow Diagrams and Specifications are presented in this section to illustrate the decomposition of the Department of Transportation User Services Requirements as well as specific strategic requirements to processes and information flow. The Logical Architecture CASE model further depicts the input (source) terminators and output (sink) terminators of the entire ITS and defines the information flow into and out of the system. It is the formal representation of the ITS operational concept described in the Theory of Operations Document. The Logical Architecture is first illustrated as a single function to show the external inputs (sources) and outputs (sinks) by the System Context Diagram. This is then decomposed in the highest level of Data Flow Diagram (DFD) to show the highest level process bubbles in the ITS. These bubbles are then further decomposed into lower levels. At the lowest level of this decomposition are the actual Process Specifications (P-Specs). |
总页数: |
282p |
报告类型: |
科技报告 |