JPL State Analysis (SA)
Overview
- JPL-developed methodology that leverages model- and state-based control architecture
- state — representation of momentary condition of evolving system
- models – describe how state evolves
- state variables — abstractions representing “knowledge” of state
- Known state of system is value of its state variables at time of interest
- Together, state and models supply what is needed to operate system, predict future state, control toward desired state, & assess performance
- SA methodology defines iterative process for state discovery & modeling
- Allows models to evolve as appropriate across project lifecycle
- SA reqts process helps bridge gap between requirements on software specified by systems engineers
- Mission Data System (MDS) — embedded software architecture designed to provide multi-mission information and control architecture for robotic exploration spacecraft
- SA information compiled in “State Database“
Tool Support
- Tool support for State Analysis (SA) is provided by the State Database [55], which utilizes a Structured Query Language (SQL)-compliant relational database management system (RDBMS) such as Oracle® with a front end user interface. This tool supports developing, managing, inspecting, and validating system and software requirements capture as part of the SA process.
Offering/Availability
- State Analysis (SA) is a JPL-developed MBSE methodology and the offering is available by means of a series of courseware and tutorials offered by SA experts. These courses are offered through JPL Professional Development on a periodic, as-needed basis, or through reimbursable contract
agreements with industry partners. As part of the hands-on exercises, access to the State Database tool and supporting training in use of the tool is provided.
Resources
- Estefan, Jeff A., “Survey of Model-Based Systems Engineering (MBSE) Methodologies,” Rev. B, INCOSE Technical Publication, Document No.: INCOSE-TD-2007-003-01, International Council on Systems Engineering, San Diego, CA, June 10, 2008.
- Mission Data System/State Analysis Public Web Site, Jet Propulsion Laboratory, California Institute of Technology, June, 2010.
- Ingham, Michel D., Rasmussen, Robert D., Bennett, Matthew B. and Alex C. Moncada, “Generating Requirements for Complex Embedded Systems Using State Analysis,” Acta Astronautica, 58, Iss. 12, pp. 648-661, Jun. 2006.
- Dvorak, Dan, Rasmussen, Robert, Reeves, Glenn and Allan Sacks, “Software Architecture Themes in JPL’s Mission Data System,” Proceedings of the AIAA Guidance, Navigation, and Control Conference, paper AIAA-99-4553, 1999.