India’s private space sector, Bengaluru-based startup GalaxEye has successfully launched Mission Drishti, the world’s first OptoSAR satellite.
The satellite was placed into orbit aboard the Falcon 9 rocket from California. Weighing about 190 kg, Drishti is also India’s largest privately built Earth observation satellite.
What is OptoSAR Technology?
OptoSAR is a hybrid Earth observation technology that combines:
- Optical imaging (camera-based)
- Synthetic Aperture Radar (SAR)
Traditional Systems vs OptoSAR
| Technology | Strength | Limitation |
|---|---|---|
| Optical Satellites | Clear, natural images | Cannot see through clouds or at night |
| SAR Satellites | Works in all weather, day & night | Images are complex and harder to interpret |
| OptoSAR (Drishti) | Combines both advantages | Advanced but more complex system |
Key Innovation:
Drishti captures optical + radar images of the same location at the same time, eliminating mismatches in timing and angle.
How Does It Work?
- Optical Multispectral Imager
- Captures detailed, color-rich images like a camera
- SAR Sensor
- Sends radar waves that bounce back from Earth
- Works through clouds, rain, smoke, and darkness
Both sensors operate simultaneously, producing:
- Sharper images
- All-weather capability
- Day & night monitoring
The satellite offers a fused resolution of ~1.8 metres, meaning highly detailed Earth observation.
Why Is This Important for India?
India faces frequent challenges like:
- Cloudy monsoon conditions
- Natural disasters (floods, cyclones)
- Large agricultural dependency
Drishti solves a key problem: continuous and reliable Earth monitoring.
Key Applications:
- Agriculture: Crop health monitoring
- Disaster Management: Floods, forest fires, landslides
- Defence & Surveillance: Border and coastal monitoring
- Urban Planning: Infrastructure development
- Environmental Tracking: Climate and ecosystem changes
Boost to India’s Space Ecosystem
Mission Drishti highlights the rise of India’s private space startups, supported by ISRO.
- Developed by IIT Madras alumni
- Built in just a few years
- Recognised as a global first in satellite technology
Key Facts at a Glance
- Satellite Name: Drishti
- Technology: OptoSAR (Optical + SAR fusion)
- Weight: ~190 kg
- Launch Date: May 3, 2026
- Launch Vehicle: Falcon 9
- Developer: GalaxEye
- Resolution: ~1.8 metres
- Unique Feature: All-weather, day-night imaging
Conclusion
The launch of Drishti marks a breakthrough in satellite imaging technology, combining the best of optical clarity and radar reliability. It not only strengthens India’s capabilities in Earth observation but also positions the country at the forefront of next-generation space innovation.