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India Successfully Launches NASA-ISRO Earth Satellite

Why in News?

India and the U.S. jointly launched the NISAR satellite using ISRO’s GSLV-F16 rocket as the launch vehicle from Sriharikota. This first-ever collaborative satellite will provide all-weather Earth observation data critical for disaster management, environmental monitoring, and agricultural planning. The NISAR satellite launch marks a significant milestone in space collaboration between the two nations.

About the Launch Details and Mission:

  • The NISAR satellite was launched on July 30 from Satish Dhawan Space Centre, Sriharikota using the GSLV-F16 rocket as the launch vehicle.
  • The satellite, weighing 2,392 kg, was injected into a sun-synchronous orbit 18 minutes after liftoff.
  • NISAR is a joint mission between ISRO and NASA, with a planned mission life of five years, showcasing a decade-long cooperation in space technology.
  • It uses dual-frequency Synthetic Aperture Radar (SAR) — NASA’s L-band radar and ISRO’s S-band radar — for Earth observations.
  • The satellite will scan Earth with a 242 km swathe using advanced SweepSAR technology for high-resolution imaging.

Mission Phases and Collaborative Development

  • The mission consists of launch, deployment, commissioning, and science operations phase.
  • Deployment involves unfolding a 12-metre reflector antenna in orbit, starting on the 10th day post-launch.
  • NASA’s Jet Propulsion Laboratory developed the L-band SAR and reflector components; ISRO developed the spacecraft bus and S-band SAR.
  • The commissioning phase follows deployment, preparing the satellite for science operations lasting the mission duration.
  • This collaboration exemplifies international cooperation in space technology and Earth observation, strengthening the space collaboration between India and the US.

Key Facts about NISAR Satellite:
● NISAR (NASA-ISRO Synthetic Aperture Radar) is the first joint Earth observation satellite by NASA and ISRO.
● It aims to monitor natural disasters, agriculture, infrastructure, and earth dynamics like ground deformation.
● Uses dual-band SAR satellite technology: NASA’s L-band radar and ISRO’s S-band radar for high-resolution, all-weather, day-night imaging.
● Observes Earth every 12 days, covering a 242 km swath using SweepSAR technology.
● Mission life is 5 years, supporting applications like flood mapping, vegetation dynamics monitoring, and ice sheet movement tracking.

About GSLV-F16 Rocket Details:
● GSLV-F16 successfully launched NISAR on July 31, 2025, from Sriharikota.
● Placed the 2,392 kg satellite into a sun-synchronous orbit.
● Demonstrated ISRO’s launch capability for complex, heavyweight international missions.
Understanding Synthetic Aperture Radar (SAR):
● SAR is a radar imaging system that provides high-resolution imaging regardless of weather or light.
● Essential for earth science studies, including tectonics, glaciology, and soil moisture tracking.
● Combines multiple radar signals to create detailed 2D and 3D images of Earth’s surface.

The NISAR mission, a result of space collaboration between India and the US, enters its science operations phase after initial checks and orbit checkout. This sophisticated engineering marvel will provide crucial data for infrastructure monitoring, vegetation dynamics analysis, and surface deformation monitoring over its 5-year mission life. The dual-band SAR satellite’s high-resolution imaging capabilities will significantly enhance our understanding of Earth’s complex systems and aid in various applications from disaster management to climate change studies.