Modeling Spacecraft Modes for Nominal and Off-nominal Operations

Bajwa, Anupa; Berg, Peter

doi:10.2514/6.2011-1444

Cited by 2 publications

(2 citation statements)

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“…A common strategy for spacecraft fault management is to execute an automated command to go to Safe Mode. As discussed in [5] spacecraft modes encapsulate many operational intentions. They define the feedback and actuators to control the spacecraft, and they provide a single command to switch between these mechanisms.…”

Section: E Choose the Right Level Of Response For Fault Managementmentioning

confidence: 99%

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Leverage Points for System Health Management of Autonomous Systems

Bajwa

2018

2018 AIAA Information Systems-Aiaa Infotech @ Aerospace

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Systems Health Management (SHM) is one of three basic functionalities that constitute an autonomous capability of a system. The other two functionalities are Planning & Scheduling, and Task Execution. In an autonomous system, variable autonomy is often distinct from variable authority to sense, decide, and act. There are quantifiable Levels of Autonomy that can be achieved by tuning different portions of the Observe-Orient-Decide-Act loop to provide flexibility and control. This approach is tabulated for multiple domains such as spacecraft and aerial vehicles. Examining SHM through a Systems Thinking lens helps us understand its stocks and flows, loops, and delays. Systems thinking, and modeling, is a useful way to understand change and complexity of systems of many types. There are certain archetypes that underlie well-known autonomy architectures. And there often are leverage pointsbest places to intervene in a systemthat can resolve or mitigate some fundamental challenges in the design and deployment of autonomous systems. I identify these levers and present the ones that have been successfully used in NASA missions.

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Section: E Choose the Right Level Of Response For Fault Managementmentioning

confidence: 99%

“…Provide a common context for subsystem designers to verbalize "what can go wrong", especially at interfaces, and during mode-or phase-transitions [5]. Coordinate, design, and implement Fault Management by leveraging, where possible, existing Flight Software modules.…”

Section: G Visualize Information Flowmentioning

confidence: 99%