NISAR Satellite Enters Science Phase

NISAR Satellite Mission Highlights:

1. Launch and Development:

   • The NASA-ISRO Synthetic Aperture Radar (NISAR) satellite was launched on July 30, 2025, from the Satish Dhawan Space Centre, Sriharikota.
   • It is the first satellite developed jointly by the Indian Space Research Organisation (ISRO) and NASA.

2. Phases of NISAR Mission:

   • The mission is categorized into distinct phases: Launch, Deployment, Commissioning, and Science.
   • The Science Phase commenced following the commissioning phase and will continue until the end of the satellite's five-year mission.

3. Satellite Specifications:

   • The satellite features a 12-meter diameter antenna reflector crucial for both ISRO's S-Band and NASA's L-Band Synthetic Aperture Radar (SAR) Payloads.
   • The antenna was deployed from a 9-meter long boom developed by NASA.

4. Operational Aspects:

   • The operational science orbit will be maintained through regular maneuvers, which will aim to minimize conflicts with scientific observations.
   • Extensive calibration and validation activities will be ongoing during this phase.

5. Data Acquisition:

   • The first image acquisition occurred on August 19, 2025, with S-Band SAR regularly imaging the Indian landmass and various global calibration-validation sites.
   • Reference targets have been deployed in locations such as Ahmedabad, Gujarat, to aid in image calibration.

6. Application Potential:

   • Initial analyses show the potential of S-Band SAR data for multiple scientific areas including:
     • Agriculture
     • Forestry
     • Geo-sciences
     • Hydrology
     • Polar and Himalayan ice/snow studies
     • Oceanic studies

7. Calibration Sites:

   • Data acquired from the Amazon rainforest has been utilized for calibrating spacecraft pointing and image quality.

By highlighting its interdisciplinary benefits, the NISAR satellite represents a significant step in Earth observation technology and international collaboration between India and the USA. Its findings are expected to hold implications for various scientific research and environmental monitoring efforts.