NASA-ISRO Synthetic Aperture Radar (NISAR) Satellite

• Context (TH): ISRO launched the NASA–ISRO Synthetic Aperture Radar (NISAR) satellite using the GSLV-F16 rocket from the Satish Dhawan Space Centre at Sriharikota, Andhra Pradesh.
• Polar Orbit: GSLV conducted its first satellite launch into sun-synchronous polar orbit (SSPO).
• Cryogenic Precision: The mission showcased the CE20 cryogenic stage’s accuracy for orbital injection.
• NASA Launch: ISRO commercially launched a fully NASA-owned satellite for the first time.

About NISAR Satellite

• Mission Life: Designed for minimum 3 years mission life for Earth-Observation (Radar Imaging).
• Orbital Details: NISAR to orbit Earth at 747km altitude in Sun-Synchronous (Low Earth) Orbit with a repeat cycle of 12 days.
• Technology: World’s first Radar Imaging Satellite to operate on dual frequencies (S and L bands).
• Cost: Considered to be one of the expensive satellite missions ever undertaken at $1.5B.
• Weight: NISAR to have a launch mass of 2800kg.

Radar Technology

• NISAR to have finest Synthetic Aperture Radar (SAR) Technology ever designed. It is designed with a massive 12-meter Antenna for receiving signals.
• Sweep SAR technology provides for wide swath high-resolution images in 3D covering a 242km width.

L-Band Synthetic Aperture Radar

• Developed by NASA’s Jet Propulsion Laboratory (JPL).
• With a wavelength of ~24cm, it is designed to penetrate Vegetation and surface materials.
• Provides high-resolution imagery for studying solid Earth processes, ice sheet dynamics, and biomass changes.

Foundation Courses

S-Band Synthetic Aperture Radar

• Developed by the ISRO.
• With a wavelength of ~10cm, it is optimised for studying surface deformation.
• Provides high-resolution imagery for monitoring natural hazards, such as earthquakes, volcanic activity, and landslides.

Key Applications of NISAR

• Surface Monitoring: Detects minute ground shifts for tectonic and structural analysis.
• All-Weather Imaging: Provides consistent data despite clouds or darkness.
• Disaster Mapping: Assesses earthquakes, floods, landslides, and volcanoes.
• Cryosphere Studies: Monitors glaciers and ice sheets for sea-level projections.
• Agro-Ecosystem Monitoring: Tracks biomass, deforestation, crop health, and soil moisture.

Significance of the Launch

• Revenue Gain: The commercial contract generated significant revenue for ISRO.
• Strategic Partnership: The joint mission deepens India-U.S. trust in complex space collaboration.
• Tech Sovereignty: Launch proved indigenous cryogenic strength for independent satellite launches.
• Global Reputation: The mission elevated India’s profile in precision foreign satellite launches.