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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Information provided by the NASA-ISRO Synthetic Aperture Radar mission (NISAR) will help to protect and inform communities around the world. The data will aid in managing agricultural fields, monitoring volcanoes, and tracking land-based ice including glaciers.NASA/JPL-Caltech Data from NISAR will map changes to Earth’s surface, helping improve crop management, natural hazard monitoring, and tracking of sea ice and glaciers.
A new U.S.-India satellite called NISAR (NASA-ISRO Synthetic Aperture Radar) will provide high-resolution data enabling scientists to comprehensively monitor the planet’s land and ice surfaces like never before, building a detailed record of how they shift over time. Hailed as a critical part of a pioneering year for U.S.-India civil space cooperation by President Trump and Prime Minister Modi during their visit in Washington in February, the NISAR launch will advance U.S.-India cooperation and benefit the U.S. in the areas of disaster response and agriculture.
As the first joint satellite mission between NASA and the Indian Space Research Organisation (ISRO), NISAR marks a new chapter in the growing collaboration between the two space agencies. Years in the making, the launch of NISAR builds on a strong heritage of successful programs, including Chandrayaan-1 and the recent Axiom Mission 4, which saw ISRO and NASA astronauts living and working together aboard the International Space Station for the first time.
The information NISAR provides will help decision-makers, communities, and scientists monitor agricultural fields, refine understanding of natural hazards such as landslides and earthquakes, and help teams prepare for and respond to disasters like hurricanes, floods, and volcanic eruptions. The satellite will also provide key global observations of changes to ice sheets, glaciers, and permafrost, as well as forests and wetlands.
The NISAR mission is slated to launch no earlier than July 30 from Satish Dhawan Space Centre on India’s southeastern coast aboard an ISRO Geosynchronous Satellite Launch Vehicle.
Here are five things to know about NISAR:
1. The NISAR satellite will provide a 3D view of Earth’s land and ice.
Two synthetic aperture radars (SARs) aboard NISAR will detect changes in the planet’s surface down to fractions of an inch. The spacecraft will bounce microwave signals off Earth’s surface and receive the return signals on a radar antenna reflector measuring 39 feet (12 meters) across. The satellite’s ability to “see” through clouds and light rain, day and night, will enable data users to continuously monitor earthquake- and landslide-prone areas and determine how quickly glaciers and ice sheets are changing. It also will offer unprecedented coverage of Antarctica, information that will help with studying how the continent’s ice sheet changes over time.
2. Data from NISAR will provide critical insights to help governments and decision-makers plan for natural and human-caused hazards.
Earthquakes, volcanoes, and aging infrastructure can pose risks to lives and property. Able to see subtle changes in Earth’s surface, NISAR can help with hazard-monitoring efforts and potentially give decision-makers more time to prepare for a possible disaster. For earthquakes, NISAR will provide insights into which parts of a fault slowly move without producing quakes and which are locked together and could potentially slip. The satellite will be able to monitor the area around thousands of volcanoes, detecting land movement that could be a precursor to an eruption. When it comes to infrastructure such as levees, aqueducts, and dams, NISAR data collected over time can help managers detect if nearby land motion could jeopardize key structures, and then assess the integrity of those facilities.
3. The most advanced radar system ever launched as part of a NASA or ISRO mission, NISAR will generate more data on a daily basis than any previous Earth satellite from either agency.
About the length of a pickup truck, NISAR’s main body contains a dual-radar payload — an L-band system with a 10-inch (25-centimeter) wavelength and an S-band system with a 4-inch (10-centimeter) wavelength. Each system is sensitive to land and ice features of different sizes and specializes in detecting certain attributes, such as moisture content, surface roughness, and motion. By including both radars on one spacecraft — a first — NISAR will be more capable than previous SAR missions. These two radars, one from NASA and one from ISRO, and the data they will produce, exemplify how collaboration between spacefaring allies can achieve more than either would alone.
NISAR press kit The radars will generate about 80 terabytes of data products per day over the course of NISAR’s prime mission. That’s roughly enough data to fill about 150 512-gigabyte hard drives each day. The information will be processed, stored, and distributed via the cloud — and accessible to all.
This artist’s concept depicts the NISAR satellite in orbit over central and Northern California. The spacecraft will survey all of Earth’s land and ice-covered surfaces twice every 12 days.NASA/JPL-Caltech 4. The NISAR mission will help monitor ecosystems around the world.
The mission’s two radars will monitor Earth’s land and ice-covered surfaces twice every 12 days. Their near-comprehensive coverage will include areas not previously covered by other Earth-observing radar satellites with such frequency. The NISAR satellite’s L-band radar penetrates deep into forest canopies, providing insights into forest structure, while the S-band radar is ideal for monitoring crops. The NISAR data will help researchers assess how forests, wetlands, agricultural areas, and permafrost change over time.
5. The NISAR mission marks the first collaboration between NASA and ISRO on a project of this scale and marks the next step in a long line of Earth-observing SAR missions.
The NISAR satellite features components developed on opposite sides of the planet by engineers from ISRO and NASA’s Jet Propulsion Laboratory working together. The S-band radar was built at ISRO’s Space Applications Centre in Ahmedabad, while JPL built the L-band radar in Southern California. After engineers from JPL and ISRO integrated NISAR’s instruments with a modified ISRO I3K spacecraft bus and tested the satellite, ISRO transported NISAR to Satish Dhawan Space Centre in May 2025 to prepare it for launch.
The SAR technique was invented in the U.S. in 1952 and now countries around the globe have SAR satellites for a variety of missions. NASA first used the technique with a space-based satellite in 1978 on the ocean-observing Seasat, which included the first spaceborne SAR instrument for scientific observations. In 2012, ISRO began launching SAR missions starting with Radar Imaging Satellite (RISAT-1), followed by RISAT-1A in 2022, to support a wide range of applications in India.
More About NISAR
Managed by Caltech in Pasadena, JPL leads the U.S. component of the project and provided the L-band SAR. JPL also provided the radar reflector antenna, the deployable boom, a high-rate communication subsystem for science data, GPS receivers, a solid-state recorder, and payload data subsystem. NASA’s Goddard Space Flight Center manages the Near Space Network, which will receive NISAR’s L-band data.
The ISRO Space Applications Centre is providing the mission’s S-band SAR. The U R Rao Satellite Centre is providing the spacecraft bus. The rocket is from Vikram Sarabhai Space Centre, launch services are through Satish Dhawan Space Centre, and satellite mission operations are by the ISRO Telemetry Tracking and Command Network. The National Remote Sensing Centre is responsible for S-band data reception, operational products generation, and dissemination.
To learn more about NISAR, visit:
https://nisar.jpl.nasa.gov/
How New NASA, India Satellite NISAR Will See Earth Powerful New US-Indian Satellite Will Track Earth’s Changing Surface NASA-ISRO Radar Mission to Provide Dynamic View of Forests, Wetlands NASA-ISRO Mission Will Map Farmland From Planting to Harvest News Media Contacts
Andrew Wang / Jane J. Lee
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 626-491-1943
andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
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Last Updated Jul 21, 2025 Related Terms
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By NASA
Photo of Matt Anderson Acting NASA Administrator Janet Petro issued the following statement regarding the nomination by President Donald Trump of Matt Anderson Wednesday to serve as the agency’s deputy administrator:
“As a retired United States Air Force colonel and executive of the Space Force Association, Matt Anderson brings extensive knowledge of space operations, aeronautics expertise, and industry experience. If confirmed, he would join NASA’s leadership team at a time when partnerships and a sharpened focus on mission are essential to our continued success. Along with President Trump’s nominee to lead NASA, Jared Isaacman, he will strengthen collaboration across sectors and help NASA advance exploration, serve the American people, and deliver results for the benefit of all.”
Throughout his over 24-year tenure in the U.S. Air Force, Anderson culminated his career as the U.S. Transportation Command’s senior liaison officer to North American Aerospace Defense Command (NORAD), U.S. Northern Command (USNORTHCOM), and U.S. Space Command (USSPACECOM). He retired as a colonel Oct. 1, 2021. Anderson is currently a vice president and Space Force & Air Force client executive at CACI. He also serves as the chief growth officer at the Space Force Association.
An alum of the U.S. Air Force Academy, Embry-Riddle Aeronautical University, and the University of Colorado at Colorado Springs, Anderson holds degrees in biology, aeronautical science, and leadership & counseling. In 2024, Anderson was named by the Washington Exec as one of their “Top Space Execs to Watch.”
For more about NASA’s mission, visit:
https://www.nasa.gov
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Bethany Stevens / Amber Jacobson
Headquarters, Washington
202-358-1600
bethany.c.stevens@nasa.gov / amber.c.jacobson@nasa.gov
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Last Updated May 07, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
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By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The C-20A aircraft, based at NASA’s Armstrong Flight Research Center in Edwards, California, flies over the Sierra Nevada Mountains in California for the Dense UAVSAR Snow Time (DUST) mission on Feb. 28, 2025. The DUST mission collected airborne data about snow water to help improve water management and reservoir systems on the ground.NASA/Starr Ginn As part of a science mission tracking one of Earth’s most precious resources – water – NASA’s C-20A aircraft conducted a series of seven research flights in March that can help researchers track the process and timeline as snow melts and transforms into a freshwater resource. The agency’s Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) installed on the aircraft collected measurements of seasonal snow cover and estimate the freshwater contained in it.
“Seasonal snow is a critical resource for drinking water, power generation, supporting multi-billion dollar agricultural and recreation industries,” said Starr Ginn, C-20A project manager at NASA’s Armstrong Flight Research Center in Edwards, California. “Consequently, understanding the distribution of seasonal snow storage and subsequent runoff is essential.”
The Dense UAVSAR Snow Time (DUST) mission mapped snow accumulation over the Sierra Nevada mountains in California and the Rocky Mountains in Idaho. Mission scientists can use these observations to estimate the amount of water stored in that snow.
Peter Wu, radar operator from NASA’s Jet Propulsion Laboratory in Southern California, observes data collected during the Dense UAVSAR Snow Time (DUST) mission onboard NASA’s C-20A aircraft on Feb. 28, 2025. The C-20A flew from NASA’s Armstrong Flight Research Center in Edwards, California, over the Sierra Nevada Mountains to collect data about snow water.NASA/Starr Ginn “Until recently, defining the best method for accurately measuring snow water equivalent (SWE) – or how much and when fresh water is converted from snow – has been a challenge,” said Shadi Oveisgharan, principal investigator of DUST and scientist at NASA’s Jet Propulsion Laboratory in Southern California. “The UAVSAR has been shown to be a good instrument to retrieve SWE data.”
Recent research has shown that snow properties, weather patterns, and seasonal conditions in the American West have been shifting in recent decades. These changes have fundamentally altered previous expectations about snowpack monitoring and forecasts of snow runoff. The DUST mission aims to better track and understand those changes to develop more accurate estimates of snow-to-water conversions and their timelines.
“We are trying to find the optimum window during which to retrieve snow data,” Oveisgharan said. “This estimation will help us better estimate available fresh snow and manage our reservoirs better.”
The Dense UAVSAR Snow Time (DUST) mission team assembles next to the C-20A aircraft at NASA’s Armstrong Flight Research Center in Edwards, California, on Feb. 28, 2025. From left, radar operator Adam Vaccaro, avionics lead Kelly Jellison, C-20A project manager Starr Ginn, pilot Carrie Worth, pilot Troy Asher, aircraft mechanic Eric Apikian, and operations engineer Ian Elkin.NASA/Starr Ginn The DUST mission achieved a new level of snow data accuracy, which is partly due to the specialized flight paths flown by the C-20A. The aircraft’s Platform Precision Autopilot (PPA) enables the team to fly very specific routes at exact altitudes, speeds, and angles so the UAVSAR can more precisely measure terrain changes.
“Imagine the rows made on grass by a lawn mower,” said Joe Piotrowski Jr., operations engineer for NASA Armstrong’s airborne science program. “The PPA system enables the C-20A to make those paths while measuring terrain changes down to the diameter of a centimeter.”
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Last Updated Apr 24, 2025 EditorDede DiniusContactErica HeimLocationArmstrong Flight Research Center Related Terms
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Spectrum is a shared resource. Since the discovery of radio waves and the invention of the telegraph, humanity has exponentially increased its use of the radio frequency (RF) spectrum. Consider how many wireless devices are around you right now. You’re probably reading this on a smartphone or laptop connected to the internet through Wi-Fi or 5G. You might be listening to music on Bluetooth headphones. If you are in a car or bus, the driver may be using signals from GPS satellites. To meet this increasing need, RF engineers and regulators continue to develop ways to enable users to share the same frequencies at the same time in the same place — think of modern cell phone technology. Avoiding or lessening interference between users requires regulators and users alike to maintain and enforce the ‘rules of the road’ that describe who can use which frequencies where, when, and how. NASA, like all other users, must comply with these regulations and collaborate with other users to ensure our use of the RF spectrum can continue and evolve.
Just as architects design taller buildings to accommodate more residences on the same plot of land, radio frequency engineers design methods to allow more users on the same frequency, at the same place and time.NASA Supporting and Protecting NASA’s Spectrum Users
NASA’s spectrum professionals work with users early in the project planning phase to understand the type, location, and duration of their data, and in turn determine what kind of antennas, transmitters, and receivers will be required. With that information, a spectrum manager helps to define the spectrum requirements, such as bandwidths, modulation, and other technical characteristics of the radio signals to be used. Understanding a project’s objectives helps define the appropriate service allocation and potential frequency ranges.
Once these spectrum requirements are determined, NASA’s spectrum professionals work with other relevant spectrum users within and beyond NASA to coordinate the use of the spectrum.
In the unfortunate event of harmful RF interference, working to identify, resolve, and report the interference is another critical function of NASA’s spectrum professionals. For example as Jeff Hayes — NASA’s current SCaN (Space Communications and Navigation) Program liaison to the Science Mission Directorate and the former program executive for operating missions in the Heliophysics and Astrophysics Divisions — recounts, “The NICER (Neutron Star Interior Composition Explorer) observatory did actually experience bouts of RF interference over certain parts of the world. As NICER uses GPS to understand where it is pointing to in the sky, interference can make the location information of the source imprecise, and that impacts the quality of the data collected. That data could potentially be attributed to the wrong star.”
When NASA identifies interference to a mission like NICER or to a device at an agency center or facility, NASA center and facility spectrum managers work to identify, resolve, and report the interference.
Identifying and reporting sources of interference helps to raise awareness of the impacts and causes of interference. When the sources of interference are international, which is especially common for space systems like NICER, SCaN’s spectrum management team works with U.S. regulators to report the incident to international regulators. These interference reports can be used to advocate for regulatory protections that help ensure the integrity of valuable science data and the safety of human spaceflight activities.
Advocating for NASA’s Current and Future Spectrum Use
NASA’s spectrum analysts and engineers perform analyses and simulations to support spectrum planning and management activities. For example, passive remote sensing instruments like the radiometer on the Soil Moisture Active Passive mission detect natural energy (radiation) emitted or reflected by an object or scene being observed. This energy is much fainter than human-generated radio signals and require highly sensitive radiometers that are susceptible to interference from more powerful signals. The spectrum management team works to ensure regulatory protections are in place and followed to ensure the integrity of NASA’s scientific missions.
Sometimes NASA’s future missions envision new ways and places to use radio waves. For example, when NASA’s Artemis campaign began taking steps to return humans to the Moon, SCaN’s spectrum professionals began working with other stakeholders to develop a RF architecture that enables the use of radio waves for science data, communications, positioning, navigation, and timing while also limiting the risk of interference with systems on or orbiting Earth. NASA’s spectrum professionals further the agency’s spectrum management goals and objectives by analyzing potential changes in international or domestic regulations and proposing technical solutions that promote collaborative spectrum use with both foreign and domestic partners.
NASA’s technical expertise is critical to ensuring domestic and international regulators are well informed as they develop new or revised regulations that effectively enable the exciting innovation and exploration central to NASA’s mission.
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Last Updated Apr 23, 2025 Related Terms
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