NASA-ISRO’s $1.3B NISAR Satellite Unfurls Radar Antenna, Marks Key Step in Global Disaster Monitoring

NASA-ISRO’s $1.3 Billion NISAR Satellite Deploys Antenna, Moves Closer to Global Disaster Monitoring.

In a landmark achievement for space science and international cooperation, the NASA-ISRO Synthetic Aperture Radar (NISAR) satellite has successfully deployed its massive radar antenna in orbit, a critical step toward providing life-saving data for disaster management worldwide.

Launched on July 30, 2025, from India’s Satish Dhawan Space Centre aboard the GSLV-F16 rocket, NISAR is the most expensive civilian Earth observation satellite ever built, weighing over 2.8 tons and costing $1.3 billion. The mission combines NASA’s L-band radar with ISRO’s S-band radar, enabling high-resolution imaging of the Earth’s surface through clouds, vegetation, and rainfall.

On August 15, 17 days after launch, the satellite’s 12-meter gold-plated wire mesh radar antenna successfully unfurled in orbit. Supported by a 9-meter boom, this drum-shaped reflector is the largest ever deployed for a NASA mission in low Earth orbit. The “blooming” process involved releasing tension in the antenna’s flexible frame and locking it into position, setting the stage for science operations to begin by late October 2025.

“This first-of-its-kind radar satellite will transform how we study the Earth and forecast natural disasters before they occur,” said Nicky Fox, NASA Science Mission Chief. Karen St. Germain, Director of NASA’s Earth Science Division, highlighted that NISAR’s data will support disaster preparedness, infrastructure monitoring, and climate resilience globally.

The satellite will revisit nearly all land and ice surfaces every 12 days, producing 3D time-lapse maps to track earthquakes, landslides, glacier movements, floods, and forest degradation. These insights will aid first responders, urban planners, and policymakers in making informed decisions.

India’s contribution extends beyond the launch. The GSLV-F16 rocket, powered by an indigenous cryogenic engine, successfully delivered the heavy payload into orbit. ISRO’s S-band radar complements NASA’s L-band system, allowing precise detection of changes in vegetation, soil moisture, and snow.

With the antenna now deployed, the NISAR team will begin calibrating the radar systems and preparing for full-scale operations. Data is expected to start flowing by October 2025, supporting climate monitoring and disaster management worldwide.

As the largest collaboration of its kind, NISAR demonstrates the power of international partnership and cutting-edge technology to protect lives and monitor the planet’s ever-changing environment.