The distributed earth model orbiter simulation (DEMOS) three dimensional system at Johnson Space Center
Article Abstract:
Flight controllers at the NASA Mission Control Center in Houston have a new visualization tool to help them support the nation's space program. The Distributed Earth Model Orbiter Simulation (DEMOS) system provides three dimensional realistic images of the shuttle as it orbits the Earth. The system displays the correct position and attitude of the spacecraft over the Earth's surface. DEMOS also models the locations of the sun, the moon, the planets and the stars. Telemetry supplies the joint angles for the robot arm. Mission Flight controllers can monitor deployment of payloads when there is no live video. DEMOS provides a flexible mission analysis and real time support tool. It unifies the disciplines of celestial mechanics, three dimensional graphics and user interfaces. This paper describes the coordinate systems, the state vector propagation methods and the Attitude Maneuver Predictor (AMP) capabilities. The Attitude Maneuver Predictor simulates eigen-axis maneuvers. Flight controllers use this mode often for analysis of thermal constraints on payloads and on the orbiter. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1993
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Real-time simulation of the space station Freedom attitude control system
Article Abstract:
Software in the Systems Engineering Simulator at NASA's Johnson Space Center must be updated frequently to insure reliability and accuracy of the simulation. The Attitude Control System of the Space Station Freedom is one large component of the station simulation which must likewise undergo upgrades and maintenance. The baseline McDonnell Douglas Space Systems Co. (MDSSC)/Honeywell Attitude Control System has been integrated into the laboratory as a new system rather than modifying the older, existing version. Because this was replacing the older version, testing and verification were simplified as the existing task interfaces could be retained. This prevented many errors while at the same time provided a realistic capability for the laboratory. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1991
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Man overboard rescue
Article Abstract:
The purpose of this paper is to examine the Manned Maneuvering Unit (MMU) Rescue Study that is being conducted in the Systems Engineering Simulator (SES) at the Johnson Space Center, Houston, Texas. The study explores the possibility of rescuing a man-overboard from the Space Station Freedom (SSF) using the MMU. The details of the study as well as some of the interesting problems that arise are discussed and a mathematical development of the equations that govern the behavior of two orbiting bodies is included. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1991
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