Engineering topics
Chau, S.
Publications and source records attributed to Chau, S..
Technology needs for development of the ultra long life missions
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Performability analysis of guarded-operation duration: a successive model-translation approach
In this paper, we present a performability study that analyzes the guarded operation duration for onboard software upgrading.
Distributed computing for autonomous on board planning and sequence validations
We propose a new conceptual approach to system-level autonomy that exploits in a synergistic way recent breakthroughs in three specific areas: automatic generation of embeddable planning and validation software, integration of telecommunications forecaster and planning tools, and fault-tolerant assignment of computing tasks to multiple processors.
Advanced avionics systems for dependable computing in future space exploration
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Modeling the Europa Pathfinder Avionics System with a model based avionics architecture tool
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Modeling the Europa Pathfinder avionics system with a model based avionics architecture tool
In order to shorten the avionics architecture development time, the Jet Propulsion Laboratory has developed a model-based architecture simultion tool called the Avionics System Architecture Tool (ASAT).
A brief introduction to the Jet Propulsion Laboratory
In this paper I will briefly describe JPL's history and some major discoveries we've made in deep space exploration.
Challenging technology and technology infusion into 21st century
In preparing for the space exploration challenges of the next century, the national aeronautics and space administration (NASA) center for integrated space micro-systems (CISM) is chartered to develop advanced spacecraft systems that can be adapted for a large spectrum of future space missions.
Highly survivable avionics systems for long-term deep space exploration
This paper summarizes work in progress in three different areas: 1) a framework for the design of higly reliable and higly available space avionics systems; 2) distributed reliable computing architecture; and 3) Guarded Software Upgrading (GSU) techniques for software upgrading during long-term missions such as the Pluto/Kuiper missions.
Highly Survivable Avionics Systems for Long-Term Deep Space Exploration
The design of highly survivable avionics systems for long-term (> 10 years) exploration of space is an essential technology for all current and future missions in the Outer Planets roadmap. Long-term exposure to extreme environmental conditions such as high radiation and low-temperatures make survivability in space a major challenge. Moreover, current and future missions are increasingly using commercial technology such as deep sub-micron (0.25 microns) fabrication processes with specialized circuit designs, commercial interfaces, processors, memory, and other commercial off the shelf components that were not designed for long-term survivability in space. Therefore, the design of highly reliable, and available systems for the exploration of Europa, Pluto and other destinations in deep-space require a comprehensive and fresh approach to this problem. This paper summarizes work in progress in three different areas: a framework for the design of highly reliable and highly available space avionics systems, distributed reliable computing architecture, and Guarded Software Upgrading (GSU) techniques for software upgrading during long-term missions. Additional information is contained in the original extended abstract.
Using COTS tools in the development of a model based avionics architecture tool
Information and discussion of the development of an Avionics Architecture Tool that is model-based using commercial off the shelf (COTS) products will be provided.
Using COTS tool in the development of a avionics architecture model based tool
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Implementation of Fault Tolerance IEEE 1394 Bus Architecture in X2000
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The Analysis of Multi-Layer Fault-Tolerance Methodology for Applying COTS in Deep Space Missions
Fault-tolerant systems are traditionally divided into fault containment regions and custom logic is added to ensure the effects of a fault within a containment region would not propagate to the other regions.
On Effectiveness of a Message-Driven Confidence-Driven Protocol for Guarded Software Upgrading
In order to accomplish dependable onboard evolution, we develop a methodology which is called guarded software upgrading (GSU).
Design of a Fault-tolerant COTS-based Bus Architecture
In this paper, we report our experiences and findings on the design of fault-tolerant bus architecture comprised of two COT buses, the IEEE 1394 and the I***Sup 2***C.
High Assurance Systems Engineering
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