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Lyndon B. Johnson Space Center,
established in 1961, is NASA's primary center for: design, development
and testing of spacecraft and associated systems for human flight;
selection and training of astronauts; planning and conducting
of human space flight missions; and participation in medical
and engineering experiments carried aboard space flights. Located
just outside of Houston, Texas, the Johnson Space Center houses
NASA Mission Control and is responsible for all on-orbit Space
Shuttle operations.
The International Space Station
(ISS) program involves 16 partner nations, 5 space agencies,
as well as several languages and cultures. ISS operations require
attention--all day, every day, all year long--from Mission Control
Centers at Johnson, in Russia, and also from the flight control
centers of our international partners. During the past year,
the ISS has grown to 105 tons--about the mass of a Space Shuttle--and
measures 240 feet wide. In August 2000, the new Johnson ISS flight
control training facility opened. Named the "Red Flight
Control Room," it is used alone or in concert with the "Blue"
shuttle flight control room and the "White" ISS control
room, to train teams for future assignments. Near the year's
end, on November 2, 2000, the Expedition One crew arrived in
a Russian Soyuz capsule to begin a new era of continuous international
cooperation in space.
Because Mission Control is a
major provider of communications, Johnson Space Center personnel
took pride when Soft phone was installed aboard ISS. Softphone
makes calling someone from orbit as easy as placing a call from
any desk at Johnson. Donning a headset plugged into their laptops,
the astronauts can reach anyone with a Johnson extension by dialing
a five-digit number. Should an astronaut wish to place a local,
long-distance, or international call, they simply dial nine first.
Softphone, though not critical
to keeping the outpost in orbit, has already become a much-appreciated
luxury. "We're really enjoying it and getting a lot of use
out of the Softphone," said Jim Voss in a voicemail message
left for Brett Parrish, a Johnson engineer who worked on the
project. "Thanks a lot It's great to have it on board."
For decades, the only way to
communicate with astronauts was via radio, which had several
limitations and relatively low signal quality. During those years,
only the privileged Capsule Communicator (CAPCOM) sat in ready
contact with astronauts. Limitations existed as to where and
when the astronauts could talk with their families over the old
radio system. "In the past the CAPCOM was the one that talked
to the astronauts and that was it--period," Parrish said.
"There were a few exceptions like flight surgeons, the President,
or the family in a protected room. Now it's as comfortable as
calling from the office, which is something we take for granted.
But if you're in a tin can for six months, it's a long time to
go without talking to your kids or your spouse."
Softphone is a dream come true
for many people. Johnson and Cisco Systems updated the phone
system for communications operations on the ground like those
in the Mission Control Center and between certain directorates.
Cisco reengineered its Softphone program, because the design
was not able to survive the NASA satellite network. The network
sometimes requires signals to be bounced around for tens of thousands
of miles before reaching their target--in this case the ISS.
But, technical problems arose involving signal delay and the
inability of the Shuttle and ISS communication systems to carry
Internet Protocol "packets" of information. Cisco engineers
revamped the program until it could handle all of the difficulties.
The Softphone, as well as other
advanced communication capabilities, could not exist without
the help of the Orbiter Communication Adapter (OCA). The little
computer card and routing equipment have revolutionized data
transfer, networking, and communications with vehicles in orbit.
The OCA "tricks" old NASA satellite links into thinking
they are a modern Ethernet network. It can be built into almost
any communication system, and can serve as a relatively inexpensive
basis for communication systems that used to cost millions.
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Astronaut
Jim Voss using the Softphone. |
Another
NASA project uses Johnson-developed technology to help in the
search for "heavenly coffee." The mission will use
an unpiloted aircraft, known as an "Uninhabited Aerial Vehicle"
or "UAV," to aid Hawaiian coffee growers by providing
the growers with color images of their crops. From this information
the growers will know, down to the day, the best time for harvesting
the beans, thus bringing the best flavor to consumers.
Part of NASA's UAV-based science
demonstration program, these flights will show the ability of
this aircraft to carry Earth-viewing scientific payloads in long-duration
missions at altitudes exceeding the endurance of a pilot in a
traditional aircraft.
The research team will use the
Pathfinder-Plus aircraft; a high-flying solar-powered UAV built
by AeroVironment, Inc., Monrovia, California. The craft will
loiter over crop fields for long periods during the harvest season.
After the flights, the Kauai Coffee Company plantation and a
research team led by Clark University, Worcester, Massachusetts,
will brief coffee industry officials on its findings.
The mission will allow NASA to
provide the benefits of aerospace research to the multi-billion
dollar coffee industry, while exhibiting capabilities that will
benefit both scientific and commercial objectives well into the
new millennium. "This mission is both scientifically exciting
and commercially appealing. While validating this new breed of
aircraft we're also providing sound science with real-world,
practical applications to the American people," said Dr.
Ghassem Asrar, Associate Administrator for Earth Sciences, NASA
Headquarters, Washington, D.C.
One particular Johnson triumph
was the successful test flight of the X-38 prototype "lifeboat," assembled
at Johnson Space Center. The X-38 floated to a successful touchdown under
the world's largest parafoil at NASA's Dryden Flight Research Center
at Edwards Air Force Base, completing the seventh large-scale free flight
test for the X-38 project.
The landing test began at an
altitude of about 37,500 feet, when the X-38 was released from
NASA's B-52 aircraft. The test verified recent enhancements made
to the X-38's flight control software and also checked advances
in the two-stage repositioning deployment of a drogue parachute
that initially slows the vehicle from 600 miles an hour to about
60 miles an hour. The parachute also sets the stage for deployment
of the 7,500-square-foot-parafoil wing. After a 13-minute gliding
descent, the unmanned X-38 touched down at a speed of less than
40 miles an hour.
The X-38 Crew Return Vehicle
program not only conducted the first successful test flight of
the world's largest parafoil, but also reached several other
X-38 milestones in 2000. These include the testing aboard shuttles
of the X-38 navigation system and the test flight of the X-38's
final body shape configuration.
Johnson made significant progress
during 2000 in critical research and development areas. The new "glass cockpit" on Space Shuttle Atlantis gives pilots
more information in a more capable display. Congress provided
additional funding for key safety upgrades designed to reduce
the risks during ascent, orbit and re-entry, and to increase
the "situational awareness" of Shuttle crews during
flight.
In the area of space operations,
Johnson's Space Operations Management Office worked to consolidate
human spaceflight communications and data services. The launch
of the latest Tracking and Data Relay Satellite marked a major
achievement in this area. Through the ongoing efforts of Johnson
researchers and engineers, the Center will continue to place
a strong emphasis on the development and commercialization of
key NASA assets and capabilities--helping U.S. businesses to "do business" in
low Earth orbit as the commercial space industry rapidly expands.
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The
Multifunction Electronic Display Subsystem (MEDS), otherwise
known as the "glass cockpit," is shown in the fixed
base Space Shuttle mission simulator at Johnson Space Center's
Mission Simulation and Training Facility. MEDS is installed on
the Space Shuttle Atlantis. |
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