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1993-05-03
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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. (818) 354-5011
FOR IMMEDIATE RELEASE August 7, 1989
Voyager 2's encounter of Neptune in late August will provide
researchers at NASA's Jet Propulsion Laboratory with an
opportunity to demonstrate a new expert system designed to
monitor the condition of interplanetary spacecraft and ground
operations.
The software demonstration, called the Spacecraft Health
Automated Reasoning Prototype (SHARP), will be used by mission
operators to better analyze radio signals from spacecraft as they
are received through the Deep Space Network (DSN) ground stations
and sent to the mission control center at JPL.
The computer program combines conventional computer science
methods with artificial intelligence techniques to automatically
detect and analyze potential spacecraft and ground data systems
problems.
Designed by the Laboratory's Computer Science and
Applications Section, SHARP is written in the LISP programming
language, and uses an advanced artificial intelligence
programming tool, called STAR*TOOL. The program supplies a
variety of advanced techniques required for building artificial
intelligence systems to meet NASA's goals for future space
exploration.
-1-
The SHARP team, headed by computer scientist David Atkinson,
earmarked Voyager 2's flyby of Neptune as a vigorous operational
setting in which to evaluate the performance of the SHARP system.
The telecommunications subsystem of the spacecraft was chosen for
the prototype demonstration because glitches frequently occur in
the telecommunications link. SHARP will be demonstrated in
parallel with Voyager operations during the near encounter phase
of the flyby.
"The technology is being extended in the next year to
monitor other spacecraft subsystems, such as power, attitude and
articulation control, and scientific instrumentation," said
Atkinson. "In addition, SHARP will be used to monitor several
spacecraft missions simultaneously, including the Magellan
mission to Venus and Galileo mission to Jupiter."
The SHARP system provides a broad range of analysis
functions to aid in monitoring spacecraft and ground control
systems. Information from a variety of data sources, for
example, is centralized into a single workstation. SHARP
automates processing and analysis of that data to enable
automatic fault detection and diagnosis using artificial
intelligence technology.
SHARP's expert system captures knowledge gained by Voyager
experts over the last 12 years and mimics their decisions when
problems arise. That produces quicker response times to mission
anomalies.
The system furnishes operators with dynamic graphics
displays for viewing data in a variety of formats. The status of
the spacecraft and ground stations can be easily determined at a
glance through the use of color-coded displays, which change to
reflect status updates or alarm conditions.
The automation efforts demonstrated in the SHARP system are
designed to enhance the productivity of mission operations in the
years ahead, reducing the workforce required to monitor
spacecraft during critical planetary encounter phases.
The Voyager Project through which the SHARP demonstration
will take place is managed by JPL for NASA. NASA's Offices of
Aeronautics and Space Technology and Space Science and
Applications are sponsoring the SHARP demonstration.
#####
#1254 dea 8/7/89
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. (818) 354-5011
PHOTO CAPTION JPL-11526-BC
A functional block diagram of the Voyager 2
telecommunications subsystem with alarm indicator and diagnosis
of the problem. The status of telecommunications components,
whether operational, off-line, or in alarm, are depicted in
color, enabling rapid status identification at a glance.
(Inset): The artificial diagnostician determines three
possible causes for the alarm, suggests corrective measures
ranked according to probability, and directs the user's attention
to other displays which may contain useful information.
#####
August 9, 1989
TO: David Atkinson
Computer Sciences
301-440
FR: Diane Ainsworth
Public Information Office
For your information, we released this press release on
Monday, August 7, and received word that headquarters released it
today. We plan to make the release available in the news room
during the encounter and will have some prints available to
reporters requesting art.