National Aeronautics and Space Administration (Nasa) - Research Article from Macmillan Science Library: Computer Sciences

This encyclopedia article consists of approximately 5 pages of information about National Aeronautics and Space Administration (Nasa).
This section contains 1,297 words
(approx. 5 pages at 300 words per page)
Buy the National Aeronautics and Space Administration (Nasa) Encyclopedia Article

Embedded Real Time Systems

Software engineer David Parnas once said that "all systems are real time systems, it is just that some are faster than others." A real time system has to achieve its results in a time indistinguishable from when they are needed. Air traffic control, anti-lock brakes, and microwave ovens are all real time systems according to that definition. When NASA was formed, the technology of the day made real time systems considerably rare. NASA soon determined that one of the great difficulties of travel to the Moon is navigation, and it decided to design the Apollo spacecraft with a real time system for flight control. This is also known as an embedded system because the computer and its software are an integral part of the entire subsystem, like the computer in an automobile.

The first piloted NASA spacecraft was Freedom 7 with Project Mercury, which...

(read more)

This section contains 1,297 words
(approx. 5 pages at 300 words per page)
Buy the National Aeronautics and Space Administration (Nasa) Encyclopedia Article
Copyrights
Macmillan Science Library: Computer Sciences
National Aeronautics and Space Administration (Nasa) from Macmillan Science Library: Computer Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
Follow Us on Facebook