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Modeling Object and Interface
Standardization
The goals are to identify a standard knowledge-based model for describing and
simulating spacecraft subsystems, identify an interface standard for subsystem
interaction, and implement a demonstration simulation using the identified models
and interfaces. Initially, three spacecraft with varying roles (e.g., instrument
deployment, communications, navigation, etc.) will be chosen as cases for study.
By July ’99, the choice and characterization of these spacecraft as well
as the decom-position into objects will be described. By November ’99,
the specifications of the interfaces will be defined. By July ’00, an example
of implementation of this decomposition will be demonstrated. By November ’00,
an example of realization of this case study using an appropriate architecture
such as the HLA or a web based communications architecture will be demonstrated.
Spacecraft Distributed Simulation
By taking advantage of component-based software running on high-performance
distributed computing systems, it is feasible to create a "virtual"
spacecraft that can support design, development, evolution, operational analysis,
knowledge capture, component and system testing and evaluation, and manufacturing.
Using model-based reasoning approaches, we propose to establish the long-term
goal of constructing such a model that can capture the functionality of spacecraft
components for structure and mechanisms, thermal, power, attitude, propulsion,
data processing, command and data handling, telemetry, and instrumentation.
Knowledge Sustainment
The goal of this project is to create a system that provides living descriptions
of spacecraft design over the lifetime of the spacecraft. The system will allow
engineers to create web documents that provide user-based views of current spacecraft
information. The user-based views will help them refine mission concepts, iterate
the design itself, plan missions, operate missions, and analyze mission and
science data. For example, developers might use web documents to simultaneously
execute spacecraft simulations and display documentation about the simulation.
In addition, designers might use web documents to capture descriptions of particular
subsystems by displaying current component specifications derived from a model
and relevant pieces of information located in scattered design documents. Using
such information effectively and efficiently over the spacecraft’s lifetime
involves a rich network of relationships among spacecraft components, functions,
models, operating concepts, operating environments, and the people that participate
in designing and using the spacecraft.
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