India-US Joint Mission NISAR Takes Off Successfully from Sriharikota
On July 30, 2025, the NASA‑ISRO Synthetic Aperture Radar (NISAR) satellite was launched successfully from India’s Satish Dhawan Space Centre in Sriharikota.
The mission represents the first collaboration of its kind between ISRO and NASA and was launched aboard the GSLV‑F16 rocket.
Lift-off occurred at 5:40 p.m. from the space centre’s second launch pad. Eighteen minutes later, the 2,392 kg satellite was placed precisely into its intended sun‑synchronous orbit.
“The GSLV‑F16 vehicle has successfully and precisely injected the NISAR satellite … into its intended orbit,” stated ISRO Chairman V. Narayanan.
Cutting‑Edge Radar Capabilities
NISAR is the first satellite to observe Earth using two radar frequencies simultaneously: NASA’s L‑band and ISRO’s S‑band SAR instruments.
It uses NASA’s 12‑metre unfurlable mesh reflector antenna integrated with ISRO’s modified I3K satellite bus. The mission employs SweepSAR technology to deliver high spatial resolution over a 242 km swathe.
NASA’s Jet Propulsion Laboratory (JPL) contributed to elements including the L‑band radar antenna and its boom, while ISRO developed spacecraft infrastructure, solar arrays, the S‑band radar, and handled the launch.
All‑Weather, Day‑Night Global Coverage
NISAR will scan Earth every 12 days, collecting data regardless of weather or light conditions. ISRO explains that the satellite can detect subtle surface changes including ground deformation, ice sheet motion, and vegetation dynamics.
It will also support applications like sea ice analysis, ship detection, shoreline monitoring, storm mapping, soil moisture estimation, surface water tracking, and improving disaster response.
NASA added that controllers have already received full acquisition of signal from the spacecraft.
Four‑Stage Mission Timeline
The mission phases include launch, deployment, commissioning, and science operations:
Launch Phase: Completed with successful GSLV‑F16 flight and placement into orbit.
Deployment Phase: Scheduled to start on day 10 after launch. A multistage arm will position the 12‑metre reflector antenna nine metres away from the main satellite body.
Commissioning Phase: Encompassing the first 90 days post‑launch, this phase includes system checks, calibration, and instrument validation.
Science Phase: Begins once commissioning ends and continues for up to five years, carrying out regular observations, trajectory corrections, and calibration activities.
Notably, this is the first GSLV mission to place a satellite into a sun‑synchronous polar orbit.
A Timely Success for ISRO
NISAR’s successful launch follows recent mission setbacks at ISRO: the PSLV‑C61/EOS‑09 launch in May failed due to technical issues, and the orbit‑raising process for the NVS‑02 satellite launched in January could not proceed due to a valve malfunction.
The achievement of NISAR offers a much‑needed boost to ISRO’s program.
Global Significance and Scientific Potential
The $1.5 billion mission took over a decade to develop and includes payload and launch infrastructure from India.
NASA’s Director of Earth Sciences, Karen St Germain, described NISAR as the most advanced radar ever built by NASA, capable of detecting minute ground shifts globally.
St Germain, present at the launch, explained that NISAR will track precursors to natural hazards like earthquakes, landslides, volcanic activity, glacial melting, and forest fires.
It will also monitor human‑induced land use changes such as agriculture and infrastructure development. NISAR’s repeated scans will strengthen ground station collaborations and boost disaster preparedness worldwide.
Diplomatic and Scientific Cooperation Highlighted
Indian Science Minister Jitendra Singh called the satellite “India’s scientific handshake with the world,” emphasizing its importance in India‑US cooperation.
ISRO Chairman Narayanan called it a “life‑saving satellite” and emblematic of India’s rising space leadership.
This launch comes weeks after Indian astronaut Shubhanshu Shukla joined the International Space Station on the Axiom‑4 mission, marking continued progress in India’s space endeavors.
Milestones in India’s Expanding Space Ambitions
India’s recent achievements include successful missions to the lunar south pole and the commissioning of its first solar observation satellite.
ISRO has set ambitious future goals: Gaganyaan—India’s first crewed spaceflight—by 2027; a national space station by 2035; and an astronaut mission to the Moon by 2040.
NISAR stands as a testament to international collaboration, technological sophistication, and a major leap forward in Earth observation and climate science.
