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By NASA
NASA’s Jet Propulsion Laboratory used radar data taken by ESA’s Sentinel-1A satellite before and after the 2015 eruption of the Calbuco volcano in Chile to create this inter-ferogram showing land deformation. The color bands west of the volcano indicate land sinking. NISAR will produce similar images.ESA/NASA/JPL-Caltech A SAR image — like ones NISAR will produce — shows land cover on Mount Okmok on Alaska’s Umnak Island . Created with data taken in August 2011 by NASA’s UAVSAR instrument, it is an example of polarimetry, which measures return waves’ orientation relative to that of transmitted signals.NASA/JPL-Caltech Data from NASA’s Magellan spacecraft, which launched in 1989, was used to create this image of Crater Isabella, a 108-mile-wide (175-kilometer-wide) impact crater on Venus’ surface. NISAR will use the same basic SAR principles to measure properties and characteristics of Earth’s solid surfaces.NASA/JPL-Caltech Set to launch within a few months, NISAR will use a technique called synthetic aperture radar to produce incredibly detailed maps of surface change on our planet.
When NASA and the Indian Space Research Organization’s (ISRO) new Earth satellite NISAR (NASA-ISRO Synthetic Aperture Radar) launches in coming months, it will capture images of Earth’s surface so detailed they will show how much small plots of land and ice are moving, down to fractions of an inch. Imaging nearly all of Earth’s solid surfaces twice every 12 days, it will see the flex of Earth’s crust before and after natural disasters such as earthquakes; it will monitor the motion of glaciers and ice sheets; and it will track ecosystem changes, including forest growth and deforestation.
The mission’s extraordinary capabilities come from the technique noted in its name: synthetic aperture radar, or SAR. Pioneered by NASA for use in space, SAR combines multiple measurements, taken as a radar flies overhead, to sharpen the scene below. It works like conventional radar, which uses microwaves to detect distant surfaces and objects, but steps up the data processing to reveal properties and characteristics at high resolution.
To get such detail without SAR, radar satellites would need antennas too enormous to launch, much less operate. At 39 feet (12 meters) wide when deployed, NISAR’s radar antenna reflector is as wide as a city bus is long. Yet it would have to be 12 miles (19 kilometers) in diameter for the mission’s L-band instrument, using traditional radar techniques, to image pixels of Earth down to 30 feet (10 meters) across.
Synthetic aperture radar “allows us to refine things very accurately,” said Charles Elachi, who led NASA spaceborne SAR missions before serving as director of NASA’s Jet Propulsion Laboratory in Southern California from 2001 to 2016. “The NISAR mission will open a whole new realm to learn about our planet as a dynamic system.”
Data from NASA’s Magellan spacecraft, which launched in 1989, was used to create this image of Crater Isabella, a 108-mile-wide (175-kilometer-wide) impact crater on Venus’ surface. NISAR will use the same basic SAR principles to measure properties and characteristics of Earth’s solid surfaces.NASA/JPL-Caltech How SAR Works
Elachi arrived at JPL in 1971 after graduating from Caltech, joining a group of engineers developing a radar to study Venus’ surface. Then, as now, radar’s allure was simple: It could collect measurements day and night and see through clouds. The team’s work led to the Magellan mission to Venus in 1989 and several NASA space shuttle radar missions.
An orbiting radar operates on the same principles as one tracking planes at an airport. The spaceborne antenna emits microwave pulses toward Earth. When the pulses hit something — a volcanic cone, for example — they scatter. The antenna receives those signals that echo back to the instrument, which measures their strength, change in frequency, how long they took to return, and if they bounced off of multiple surfaces, such as buildings.
This information can help detect the presence of an object or surface, its distance away, and its speed, but the resolution is too low to generate a clear picture. First conceived at Goodyear Aircraft Corp. in 1952, SAR addresses that issue.
“It’s a technique to create high-resolution images from a low-resolution system,” said Paul Rosen, NISAR’s project scientist at JPL.
As the radar travels, its antenna continuously transmits microwaves and receives echoes from the surface. Because the instrument is moving relative to Earth, there are slight changes in frequency in the return signals. Called the Doppler shift, it’s the same effect that causes a siren’s pitch to rise as a fire engine approaches then fall as it departs.
Computer processing of those signals is like a camera lens redirecting and focusing light to produce a sharp photograph. With SAR, the spacecraft’s path forms the “lens,” and the processing adjusts for the Doppler shifts, allowing the echoes to be aggregated into a single, focused image.
Using SAR
One type of SAR-based visualization is an interferogram, a composite of two images taken at separate times that reveals the differences by measuring the change in the delay of echoes. Though they may look like modern art to the untrained eye, the multicolor concentric bands of interferograms show how far land surfaces have moved: The closer the bands, the greater the motion. Seismologists use these visualizations to measure land deformation from earthquakes.
Another type of SAR analysis, called polarimetry, measures the vertical or horizontal orientation of return waves relative to that of transmitted signals. Waves bouncing off linear structures like buildings tend to return in the same orientation, while those bouncing off irregular features, like tree canopies, return in another orientation. By mapping the differences and the strength of the return signals, researchers can identify an area’s land cover, which is useful for studying deforestation and flooding.
Such analyses are examples of ways NISAR will help researchers better understand processes that affect billions of lives.
“This mission packs in a wide range of science toward a common goal of studying our changing planet and the impacts of natural hazards,” said Deepak Putrevu, co-lead of the ISRO science team at the Space Applications Centre in Ahmedabad, India.
Learn more about NISAR at:
https://nisar.jpl.nasa.gov
News Media Contacts
Andrew Wang / Jane J. Lee
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-354-0307
andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
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Last Updated Jan 21, 2025 Related Terms
NISAR (NASA-ISRO Synthetic Aperture Radar) Earth Earth Science Earth Science Division Jet Propulsion Laboratory Explore More
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By European Space Agency
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By European Space Agency
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By NASA
A collage of artist concepts highlighting the novel approaches proposed by the 2025 NIAC awardees for possible future missions.Credit: NASA/Left to Right: Saurabh Vilekar, Marco Quadrelli, Selim Shahriar, Gyula Greschik, Martin Bermudez, Ryan Weed, Ben Hockman, Robert Hinshaw, Christine Gregg, Ryan Benson, Michael Hecht NASA selected 15 visionary ideas for its NIAC (NASA Innovative Advanced Concepts) program which develops concepts to transform future missions for the benefit of all. Chosen from companies and institutions across the United States, the 2025 Phase I awardees represent a wide range of aerospace concepts.
The NIAC program nurtures innovation by funding early-stage technology concept studies for future consideration and potential commercialization. The combined award for the 2025 concepts is a maximum of $2.625M in grants to evaluate technologies that could enable future aerospace missions.
“Our next steps and giant leaps rely on innovation, and the concepts born from NIAC can radically change how we explore deep space, work in low Earth orbit, and protect our home planet” said Clayton Turner, associate administrator for NASA’s Space Technology Mission Directorate in Washington. “From developing small robots that could swim through the oceans of other worlds to growing space habitats from fungi, this program continues to change the possible.”
The newly selected concepts include feasibility studies to explore the Sun’s influence on our solar system, build sustainable lunar habitats from glass, explore Saturn’s icy moon, and more. All NIAC studies are in the early stages of conceptual development and are not considered official NASA missions.
Ryan Weed, Helicity Space LLC in Pasadena, California, proposes a constellation of spacecraft powered by the Helicity Drive, a compact and scalable fusion propulsion system, that could enable rapid, multi-directional exploration of the heliosphere and beyond, providing unprecedented insights on how the Sun interacts with our solar system and interstellar space. Demonstrating the feasibility of fusion propulsion could also benefit deep space exploration including crewed missions to Mars.
Martin Bermudez, Skyeports LLC in Sacramento, California, presents the concept of constructing a large-scale, lunar glass habitat in a low-gravity environment. Nicknamed LUNGS (Lunar Glass Structure), this approach involves melting lunar glass compounds to create a large spherical shell structure. This idea offers a promising solution for establishing self-sustaining, large-scale habitats on the lunar surface.
Justin Yim, University of Illinois in Urbana, proposes a jumping robot appropriately named LEAP (Legged Exploration Across the Plume), as a novel robotic sampling concept to explore Enceladus, a small, icy moon of Saturn that’s covered in geysers, or jets. The LEAP robots could enable collection of pristine, ocean-derived material directly from Enceladus’s jets and measurement of particle properties across multiple jets by traveling from one to another.
“All advancements begin as an idea. The NIAC program allows NASA to invest in unique ideas enabling innovation and supporting the nation’s aerospace economy,” said John Nelson, program executive for NASA’s Innovative Advanced Concepts in Washington.
The NIAC researchers, known as fellows, will investigate the fundamental premise of their concepts, identify potential challenges, and look for opportunities to bring these concepts to life.
In addition to the projects mentioned above, the following selectees received 2025 NIAC Phase I grants:
Michael Hecht, Massachusetts Institute of Technology, Cambridge: EVE (Exploring Venus with Electrolysis) Selim Shahriar, Northwestern University, Evanston, Illinois: SUPREME-QG: Space-borne Ultra-Precise Measurement of the Equivalence Principle Signature of Quantum Gravity Phillip Ansell, University of Illinois, Urbana: Hy2PASS (Hydrogen Hybrid Power for Aviation Sustainable Systems) Ryan Benson, ThinkOrbital Inc., Boulder, Colorado: Construction Assembly Destination Gyula Greschik, Tentguild Engineering Co, Boulder, Colorado: The Ribbon: Structure Free Sail for Solar Polar Observation Marco Quadrelli, NASA’s Jet Propulsion Laboratory in California’s Silicon Valley: PULSAR: Planetary pULSe-tAkeRv Ben Hockman, NASA’s Jet Propulsion Laboratory in California’s Silicon Valley: TOBIAS: Tethered Observatory for Balloon-based Imaging and Atmospheric Sampling Kimberly Weaver, NASA’s Goddard Space Flight Center in Greenbelt, Maryland: Beholding Black Hole Power with the Accretion Explorer Interferometer John Mather NASA’s Goddard Space Flight Center in Greenbelt, Maryland: Inflatable Starshade for Earthlike Exoplanets Robert Hinshaw, NASA’s Ames Research Center in Moffett Field, California: MitoMars: Targeted Mitochondria Replacement Therapy to Boost Deep Space Endurance Christine Gregg, NASA’s Ames Research Center in Moffett Field, California: Dynamically Stable Large Space Structures via Architected Metamaterials Saurabh Vilekar, Precision Combustion, North Haven, Connecticut: Thermo-Photo-Catalysis of Water for Crewed Mars Transit Spacecraft Oxygen Supply NASA’s Space Technology Mission Directorate funds the NIAC program, as it is responsible for developing the agency’s new cross-cutting technologies and capabilities to achieve its current and future missions.
To learn more about NIAC, visit:
https://www.nasa.gov/niac
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Jasmine Hopkins
Headquarters, Washington
321-431-4624
jasmine.s.hopkins@nasa.gov
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Last Updated Jan 10, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
NASA Innovative Advanced Concepts (NIAC) Program Space Technology Mission Directorate View the full article
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