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LIFA: Lightweight Fiber-based Antenna for Small Sat-Compatible Radiometry
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By NASA
Main Takeaways:
New 66-foot-wide antenna dishes will be built, online, and operational in time to provide near-continuous communications services to Artemis astronauts at the Moon later this decade. Called LEGS, short for Lunar Exploration Ground Sites, the antennas represent critical infrastructure for NASA’s vision of supporting a sustained human presence at the Moon. The first three of six proposed LEGS are planned for sites in New Mexico, South Africa, and Australia. LEGS will become part of NASA’s Near Space Network, managed by the agency’s Space Communications and Navigation (SCaN) program and led out of Goddard Space Flight Center in Greenbelt, Maryland. Background:
NASA’s LEGS can do more than help Earthlings move about the planet.
Three Lunar Exploration Ground Sites, or LEGS, will enhance the Near Space Network’s communications services and support of NASA’s Artemis campaign.
NASA’s Space Communications and Navigation (SCaN) program maintains the agency’s two primary communications networks — the Deep Space Network and the Near Space Network, which enable satellites in space to send data back to Earth for investigation and discovery.
Using antennas around the globe, these networks capture signals from satellites, collecting data and enabling navigation engineers to track the mission. For the first Artemis mission, these networks worked in tandem to support the mission as it completed its 25-day journey around the Moon. They will do the same for the upcoming Artemis II mission.
To support NASA’s Moon to Mars initiative, NASA is adding three new LEGS antennas to the Near Space Network. As NASA works toward sustaining a human presence on the Moon, communications and navigation support will be crucial to each mission’s success. The LEGS antennas will directly support the later Artemis missions, and accompanying missions like the human landing system, lunar terrain vehicle, and Gateway.
The Gateway space station will be humanity’s first space station in lunar orbit as a vital component of the Artemis missions to return humans to the Moon for scientific discovery and chart a path for humans to Mars.NASA “One of the main goals of LEGS is to offload the Deep Space Network,” said TJ Crooks, LEGS project manager at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “The Near Space Network and its new LEGS antennas will focus on lunar missions while allowing the Deep Space Network to support missions farther out into the solar system — like the James Webb Space Telescope and the interstellar Voyager missions.”
The Near Space Network provides communications and navigation services to missions anywhere from near Earth to 1.2 million miles away — this includes the Moon and Sun-Earth Lagrange points 1 and 2. The Moon and Lagrange points are a shared region with the Deep Space Network, which can provide services to missions there and farther out in the solar system.
An artist’s rendering of a lunar terrain vehicle on the surface of the Moon.NASA The LEGS antennas, which are 66 feet in diameter, will be strategically placed across the globe. This global placement ensures that when the Moon is setting at one station, it is rising into another’s view. With the Moon constantly in sight, the Near Space Network will be able to provide continuous support for lunar operations.
How it Works:
As a satellite orbits the Moon, it encodes its data onto a radio frequency signal. When a LEGS antenna comes into view, that satellite (or rover, etc.) will downlink the signal to a LEGS antenna. This data is then routed to mission operators and scientists around the globe who can make decisions about spacecraft health and orbit or use the science data to make discoveries.
The LEGS antennas are intended to be extremely flexible for users. For LEGS-1, LEGS-2, and LEGS-3, NASA is implementing a “dual-band approach” for the antennas that will allow missions to communicate using two different radio frequency bands — X-band and Ka-band. Typically, smaller data packets — like telemetry data — are sent over X-band, while high-resolution science data or imagery needs Ka-band. Due to its higher frequency, Ka-band allows significantly more information to be downlinked at once, such as real-time high-resolution video in support of crewed operations.
LEGS will directly support the Artemis campaign, including the Lunar Gateway, human landing system (HLS), and lunar terrain vehicle (LTV).NASA Further LEGS capacity will be sought from commercial service providers and will include a “tri-band approach” for the antennas using S-band in addition to X- and Ka-band.
The first LEGS ground station, or LEGS-1, is at NASA’s White Sands Complex in Las Cruces, New Mexico. NASA is improving land and facilities at the complex to receive the new LEGS-1 antenna.
The LEGS-2 antenna will be in Matjiesfontein, South Africa, located near Cape Town. In partnership with SANSA, the South African National Space Agency, NASA chose this location to maximize coverage to the Moon. South Africa was home to a ground tracking station outside Johannesburg that played a role in NASA’s Apollo missions to the Moon in the 1960s. The agency plans to complete the LEGS-2 antenna in 2026. For LEGS-3, NASA is exploring locations in Western Australia.
These stations will fully complement the existing capabilities of the Near and Deep Space Networks and allow for more robust communications services to the Artemis campaign.
The LEGS antennas (similar in appearance to this 20.2-meter CPI Satcom antenna) will be placed in equidistant locations across the globe. This ensures that when the Moon is setting at one station, it will be rising into another’s view. With the Moon constantly in sight, NASA’s Near Space Network will be able to support approximately 24/7 operations with Moon-based missions.CPI Satcom CPI Satcom is building the Lunar Exploration Ground Site (LEGS) antennas for NASA. The antennas will look very similar to the 20-meter antenna pictured here. CPI Satcom The Near Space Network is funded by NASA’s Space Communications and Navigation (SCaN) program office at NASA Headquarters in Washington and operated out of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
About the Author
Kendall Murphy
Technical WriterKendall Murphy is a technical writer for the Space Communications and Navigation program office. She specializes in internal and external engagement, educating readers about space communications and navigation technology.
5 Min Read Ground Antenna Trio to Give NASA’s Artemis Campaign ‘LEGS’ to Stand On
An artist’s rendering of astronauts working near NASA’s Artemis base camp, complete with a rover and RV. Credits: NASA Share
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Last Updated Jul 22, 2024 EditorKatherine SchauerContactKendall MurphyLocationGoddard Space Flight Center Related Terms
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By NASA
“Houston, Tranquility Base here, the Eagle has landed.” “That’s one small step for [a] man, one giant leap for mankind.” “Magnificent desolation.” Three phrases that recall humanity’s first landing on and exploration of the lunar surface. In July 1969, Apollo 11 astronauts Neil A. Armstrong, Michael Collins, and Edwin E. “Buzz” Aldrin completed humanity’s first landing on the Moon. They fulfilled President John F. Kennedy’s national goal, set in May 1961, to land a man on the Moon and return him safely to the Earth before the end of the decade. Scientists began examining the first Moon rocks two days after the Apollo 11 splashdown while the astronauts began a three-week postflight quarantine.
Just another day at the office. Apollo 11 astronauts Neil A. Armstrong, left, Michael Collins, and Edwin E. “Buzz” Aldrin arrive for work at NASA’s Kennedy Space Center in Florida four days before launch.
Left: Buzz, Mike, and Neil study their flight plans one more time. Middle: Neil and Buzz in the Lunar Module simulator. Right: Mike gets in some flying a few days before launch.
Buzz, Neil, and Mike look very relaxed as they talk to reporters in a virtual press conference on July 14.
Left: The crew. Middle: The patch. Right: The crew conquer the Moon, a TIME LIFE photograph.
Left: Breakfast, the most important meal if you’re going to the Moon. Middle: Proper attire for lunar travel. Right: Wave good-bye to all your friends and supporters before you head for the launch pad.
Left: Engineers in the Launch Control Center at NASA’s Kennedy Space Center in Florida monitor the countdown. Middle: Once the rocket clears the launch tower, they turn control over to another team and they can watch it ascend into the sky. Right: Engineers in the Mission Control Center at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, take over control of the flight once the tower is clear.
Left: Lady Bird, LBJ, and VP Agnew in the VIP stands. Right: A million more camped out along the beaches to see the historic launch.
July 16, 1969. And we’re off!! Liftoff from Launch Pad 39A.
Left: The American flag is pictured in the foreground as the Saturn V rocket for the historic Apollo 11 mission soars through the sky. Middle: First stage separation for Apollo 11. Right: Made it to orbit!
Left: Hey, don’t forget your LM! Middle: Buzz in the LM: “S’allright?” “S’allright!” Right: As the world turns smaller.
Left: Hello Moon! Middle left: Hello Earth! Middle right: See you soon, Columbia! Right: See you soon, Eagle! Happy landing!
July 20, 1969. Left: Magnificent desolation, from Buzz’s window after landing. Middle: Neil takes THE first step. Right: First image taken from the lunar surface.
Left: Neil grabs a contingency sample, just in case. Middle left: Buzz joins the party. Middle right: Neil and Buzz read the plaque. Right: Buzz sets up the solar wind experiment.
Left: Buzz and Neil set up the flag. Middle left: Neil takes that famous photo of Buzz. Middle right: You know, this famous photo! Right: Often misidentified as Neil’s first footprint, it’s actually Buzz’s to test the lunar soil.
Left: Buzz had the camera for a while and snapped one of the few photos of Neil on the surface. Middle left: Buzz, the seismometer, and the LM. Middle right: The LM and the laser retroreflector. Right: One of two photos from the surface that show both Buzz, the main subject, and Neil, the reflection.
Neil took a stroll to Little West Crater and took several photos, spliced together into this pano.
Left: Neil after the spacewalk, tired but satisfied. Middle left: Ditto for Buzz. Middle right: The flag from Buzz’s window before they went to sleep. Right: The same view, and the flag moved! Not aliens, it settled in the loose lunar regolith overnight.
July 21, 1969. Left: Liftoff, the Eagle has wings again! Middle left: Eagle approaches Columbia, and incidentally everyone alive at the time is in this picture, except for Mike who took it. Middle right: On the way home, the Moon gets smaller. Right: And the Earth gets bigger.
July 24, 1969. Left: Splashdown, as captured from a recovery helicopter. Middle: Upside down in Stable 2, before balloons inflated to right the spacecraft. Right: Wearing his Biological Isolation Garment (BIG), Clancy Hatleberg, the decontamination officer, sets up his decontamination canisters. He’s already handed the astronauts their BIGs, who are donning them inside the spacecraft.
Left: Hatleberg, left, with Neil, Buzz, and Mike in the decontamination raft. Middle: Taken by U.S. Navy UDT swimmer Mike Mallory in a nearby raft, Hatleberg prepares to capture the Billy Pugh net for Neil, while Buss and Mike wave to Mallory. Right: The same scene, taken from the recovery helicopter, the Billy Pugh net visible at the bottom of the photo.
Left: Once aboard the U.S.S. Hornet, Mike, Neil, and Buzz wearing their BIGs walk the 10 steps from the Recovery One helicopter to the Mobile Quarantine Facility (MQF), with NASA flight surgeon Dr. William Carpentier, in orange suit, following behind. Middle left: NASA engineer John Hirasaki filmed the astronauts as they entered the MQF. Middle right: Changed from their BIGs into flight suits, Mike, Neil, and Buzz chat with President Nixon through the MQF’s window. Right: Neil, playing the ukelele, Buzz, and Mike inside the MQF.
Follow the Moon rocks from the Hornet to Ellington AFB. Left: NASA technician receives the first box of Moon rocks from the MQF’s transfer lock. Middle Left: Within a few hours of splashdown, the first box of Moon rocks departs Hornet bound for Johnston Island, where workers transferred it to a cargo plane bound for Houston. Middle right: Workers at Houston’s Ellington Air Force Base unload the first box of Moon rocks about eight hours later. Right: Senior NASA managers hold the first box of Moon rocks.
July 25, 1969. Follow the Moon rocks from Ellington to the glovebox in the Lunar Receiving Laboratory (LRL). Left: NASA officials Howard Schneider and Gary McCollum carry the first box of Moon rocks from the cargo plane to a waiting car for transport to the LRL at MSC. Middle right: In the LRL, technicians at MSC unpack the first box of Moon rocks. Middle right: Technicians weigh the box of Moon rocks. Right: The first box of Moon rocks inside a glovebox.
July 26, 1969. Follow the Moon rocks in the LRL glovebox. Left: The first box of Moon rocks has been unwrapped. Middle: The box has been opened, revealing the first lunar samples. Right: The first rock to be documented, less than 48 hours after splashdown.
July 26, 1969. Follow the astronauts from Hornet to Honolulu. Left: Two days after splashdown, the U.S.S. Hornet docks at Pearl Harbor in Honolulu. Middle left: Workers lift the MQF, with Neil, Mike, and Buzz inside, onto the pier. Middle right: A large welcome celebration for the Apollo 11 astronauts. Right: The MQF seen through a lei.
Follow the astronauts from Pearl Harbor to Ellington AFB. Left: Workers truck the MQF from Pearl Harbor to nearby Hickam AFB. Middle left: Workers load the MQF onto a cargo plane at Hickam for the flight to Houston. Middle right: During the eight-hour flight, NASA recovery team members pose with Neil, Mike, and Buzz, seen through the window of the MQF. Right: Workers unload the MQF at Houston’s Ellington AFB.
July 27, 1969. Follow the astronauts from Ellington to working in the LRL. Left: At Ellington, Neil, Mike, and Buzz reunite with their wives Jan, Pat, and TBS. Middle left: The MQF docks at the LRL. Middle right: Neil, Mike, and Buzz address the workers inside the LRL. Right: It’s back to work for Neil, Mike, and Buzz as they hold their debriefs in a glass-walled conference room in the LRL.
Follow the spacecraft from splashdown to Hawaii. Left: Sailors hoist the Command Module Columbia onto the deck of the U.S.S. Hornet. Middle left: The flexible tunnel connects the CM to the MQF, allowing for retrieval of the Moon rocks and other items. Center: U.S. Marines guard Columbia aboard the Hornet. Middle right: Columbia brought on deck as Hornet docks in Pearl Harbor. Right: NASA engineers safe Columbia on Ford Island in Honolulu.
July 31, 1969. Follow the spacecraft from Hawaii to the LRL. Left: Airmen load Columbia onto a cargo plane at Hickam AFB for the flight to Houston. Middle: Columbia arrives outside the LRL, where the MQF is still docked. Right: Hirasaki opens the hatch to Columbia in the LRL.
To be continued …
News from around the world in July 1969:
July 1 – Investiture of Prince Charles, age 21, as The Prince of Wales.
July 3 – 78,000 attend the Newport Jazz Festival in Newport, Rhode Island.
July 4 – John Lennon and the Plastic Ono Band release the single “Give Peace a Chance.”
July 11 – David Bowie releases the single “Space Oddity.”
July 11 – The Rolling Stones release “Honky Tonk Woman.”
July 14 – “Easy Rider,” starring Dennis Hopper, Peter Fonda, and Jack Nicholson, premieres.
July 18 – NASA Administrator Thomas O. Paine approves the “dry” workshop concept for the Apollo Applications Program, later renamed Skylab.
July 26 – Sharon Sites Adams becomes the first woman to solo sail the Pacific Ocean.
July 31 – Mariner 6 makes close fly-by of Mars, returning photos and data.
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By European Space Agency
Video: 00:13:39 In this first episode of our docu-series, we embark on the exciting journey of the YPSat (Young Professional Satellite), a satellite flying on-board the inaugural flight of Ariane 6, Europe’s new heavy launcher. Two years ago, a team of Young Professionals at ESA, with diverse backgrounds, nationalities and expertise, have come together around one passion and with one ambition; design, manufacture and send their own satellite to space.
Starting with some trivial ideas, the team matured their mission objectives and won the approval and support of ESA management to kick start the project. YPSat will be ‘the witness’ of Ariane 6: it will record the fairing separation, document the CubeSats deployment and send back beautiful in-orbit images of Earth and space.
This scaled-down mission has all the ingredients of a large flagship mission; engineering, verification, testing and production assurance; project management, tight schedule, team coordination and communication; failures, crisis situations and successes.
YPSat is a blueprint for the future of European space exploration. It has been a life changing opportunity for young professionals at ESA to get hands-on experience and experience the process of developing a space mission. But it has also been an eye-opening occasion for the European Space Agency to get inspired by the young generations, bringing in new ideas and technologies.
This is just the beginning of the adventure for the YPSat team. The next episode will unravel the creativity, ingenuity and determination that the young professionals brought in to achieve the mission’s objectives. What powers the satellite? Who activates the cameras? How is the data transmitted back on Earth?
Credits:
Directed and produced by Chilled Winston: https://chilledwinston.com/ and Emma de Cocker
Powered by ESA - European Space Agency
Music from Epidemic Sound
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By European Space Agency
Europe’s newest rocket soon launches, taking with it many space missions, each with a unique objective, destination and team at home, cheering them on. Whether launching new satellites to look back and study Earth, peer out to deep space or test important new technologies in orbit, Ariane 6’s first flight will showcase the versatility and flexibility of this impressive, heavy-lift launcher. Read on for all about GRBBeta, then see who else is flying first.
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By NASA
This article tells the story of one small American flag fortunate enough to be singled out from a group of one thousand flags just like it and embark on an incredible journey. The other 999 flags likely ended up as gifts, but this one flag had a loftier fate. It wasn’t the first American flag to ride on a crewed spacecraft into space, that one flew aboard Freedom 7 with Alan B. Shepard on May 5, 1961. Or the most famous flag that went into space, the Stars and Stripes planted on the Moon by Apollo 11 astronauts Neil A. Armstrong and Edwin E. “Buzz” Aldrin on July 20, 1969, holds that honor. Other American flags have even flown on spacecraft not just to other planets but out of the solar system entirely. And tens of thousands of other small flags have thundered into space aboard space shuttles and returned to Earth for distribution around the world. So what makes this one small flag, known as the Legacy Flag, so special?
Left: Launch of space shuttle Columbia on the STS-1 mission, April 12, 1981. Right: Landing of Columbia, April 14, 1981.
Space shuttle Columbia first lifted off from NASA’s Kennedy Space Center (KSC) in Florida on April 12, 1981, to usher in a new era of reusable crewed space transportation. It carried not only its two pilots, John W. Young and Robert L. Crippen, but also the Official Flight Kit (OFK), stowed away in the lockers in the shuttle’s middeck, along with food, clothing and other supplies. Many of the OFK items, including 1,000 8-by-12-inch American flags, were destined for distribution after the mission to commemorate its historic significance. Once they returned to Earth and workers removed them from the shuttle’s middeck, NASA distributed many of the flags to various people and organizations. But some remained and ended up in storage at NASA’s Johnson Space Center (JSC) in Houston. As the shuttle program progressed over the next 30 years, the number of flags in storage dwindled as additional recipients were identified. Finally, in 2011 it was time for the last shuttle mission, STS-135, and NASA felt it a fitting tribute to refly one of the flags from STS-1 on the final flight. Since STS-135 delivered supplies to the International Space Station, the flag would remain on board until the next time an American spacecraft carrying American astronauts launched from American soil arrived at the station. At the time, no one knew exactly how long that would take.
Left: Launch of STS-135, July 8, 2011. Right: The crew of STS-135 pose with the Legacy Flag on the flight deck of Atlantis.
On July 8, 2011, space shuttle Atlantis lifted off to begin STS-135, the final mission of the program with Christopher J. Ferguson, Douglas G. Hurley, Sandra H. Magnus, and Rex J. Walheim aboard, and two days later they docked with the station. The six international crewmembers of Expedition 28 welcomed them aboard. The long-term plan for the little flag was publicly revealed during a live TV session between the crew and President Barack H. Obama. “I also understand that Atlantis brought a unique American flag up to the station,” said President Obama. Shuttle Commander Ferguson explained that before their departure they would present the flag to the crew aboard the station, where “it will hopefully maintain a position of honor until the next vehicle launched from U.S. soil brings U.S. astronauts up to dock with the space station.”
Left: The crews of STS-135 and Expedition 28 pose with the Legacy Flag. Right: The crews of STS-135 and Expedition 28 place the Legacy Flag on the hatch of the Harmony module.
On July 18, near the end of the docked phase of STS-135, during a televised ceremony the crews placed the flag, flanked by the patches of the first and last space shuttle missions, on the forward hatch of the Harmony module, from where Atlantis would soon depart and where the next American crewed spacecraft would dock. After the shuttle and its crew left, the flag remained on the hatch for a while, but as time passed, onboard crews needed to use that area for stowage and so they moved it to a nearby wall for safekeeping. In 2015, to further safeguard the flag against damage or loss, Mission Control asked the onboard crew to place it in a stowage bag. As sometimes happens with stowage bags, this one moved around and ended up in a different module of the station. Three years later, during a general inventory of stowage bags, the crew found the flag and placed in a Ziploc bag with the words “Flown on STS-1 & STS-135. Only to be removed by crew launching from KSC” attached.
Left: The Legacy Flag, placed between the STS-1 and STS-135 patches on the Harmony module’s forward hatch as Atlantis prepared to depart. Middle: In May 2014, during Expedition 40, astronauts mounted the flag on a wall near the Harmony module’s hatch to allow that area to be used for stowage. Right: The Legacy Flag in July 2018 during Expedition 56, placed in a Ziploc bag for safety.
On May 30, 2020, a Falcon 9 rocket blasted off from KSC’s Launch Pad 39A, the same pad used for STS-1 and STS-135, carrying SpaceX’s Crew Dragon capsule on its Demo 2 mission. Aboard were Doug Hurley, who flew aboard the last shuttle mission, and Robert L. Behnken, the first American astronauts launched aboard an American spacecraft from American soil since STS-135. Once in orbit, Hurley and Behnken announced that they had christened their spacecraft Endeavour. The next day, Endeavour docked with the station, and Hurley and Behnken came aboard, welcomed by Expedition 63 Commander NASA astronaut Christopher J. Cassidy and Flight Engineers Anatoli A. Ivanishin and Ivan V. Vagner representing Roscosmos. Mounted on the open hatch as they floated aboard the station was our intrepid little flag, in space for nine years, and 39 years after making its first trip into space. After their arrival, Cassidy, Hurley and Behnken held a press conference and proudly displayed the flag and how it stood as a symbol of the return of American launch capability. The flag’s nine-year journey came to end when Hurley and Behnken brought it back to Earth on Aug. 2, 2020. The flag first went on display at SpaceX’s facility in Hawthorne, California, then toured the country for a few months, making its final public appearance at the World Petroleum Congress in Houston in December 2021. Currently in storage at JSC, the Legacy Flag will fly again, possibly on even more distant journeys.
Left: The Harmony module’s forward hatch bearing the Legacy Flag, opened to welcome the SpaceX Demo 2 crew. Middle: NASA astronauts Robert L. Behnken, left, Douglas G. Hurley (holding the Legacy Flag), and Christopher J. Cassidy during a press conference. Right: The Legacy Flag in its display case after its return to Earth.
During its time on the space station, the Legacy Flag saw 100 visitors from many nationalities come and go, some of them more than once. Most stayed six months, some stayed longer, up to almost one year. A few made short visits of about a week. During all that time, the space station remained a busy beehive of activity, with hundreds of experiments conducted by the international crews. Many astronauts ventured outside, to repair equipment, place new experiments out, or bring older ones back inside. And in that time, the flag traveled more than 1.3 billion miles.
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