Mention salient features of “Mission Drishti”. Discuss the imaging techniques used in the satellite launched on 3rd May 2026. Why it is being considered world’s first satellite of its kind?

What Mission Drishti is

Mission Drishti is the Earth-observation satellite built by GalaxEye, a Bengaluru space startup founded by former members of an IIT Madras student team. It was launched on 3 May 2026 aboard a SpaceX Falcon 9 from Vandenberg, and it carries the world's first operational OptoSAR payload — optical and synthetic aperture radar sensors fused on a single platform.

Salient features

• India's largest privately built satellite, at roughly 190 kg.
• Dual-sensor payload: a multispectral electro-optical imager and a synthetic aperture radar, imaging the same scene simultaneously.
• Fused resolution of about 1.8 metres, with the company claiming up to three times more actionable insight than a comparable single-sensor satellite.
• Onboard AI processing using NVIDIA's Jetson Orin platform, so inference happens on the satellite and only useful output is downlinked rather than raw imagery.
• Electric propulsion for orbit maintenance, extending operational life.
• Designed as the first of a planned constellation rather than a one-off demonstrator.

The two imaging techniques

Electro-optical, multispectral

• Passive. It records reflected sunlight across visible and near-infrared bands.
• Strength: spectral information. It distinguishes crop type, vegetation health, water quality and material composition, because different surfaces reflect differently across bands.
• Weakness: it cannot see through cloud, smoke or haze, and it cannot image at night.

Synthetic Aperture Radar

• Active. It transmits microwave pulses and records the backscatter, synthesising a large virtual antenna from the satellite's own motion along its orbit — which is what gives high resolution from a physically small antenna.
• Strength: microwaves penetrate cloud and need no sunlight, so it images in all weather, day and night. It is sensitive to structure, roughness, moisture and change.
• Weakness: no spectral or colour information, and the imagery is harder to interpret.

Why fusing them is the achievement

The two are complementary in exactly the places each fails, so combining them is obvious in principle and hard in practice. Optical and SAR payloads have very different power, thermal, pointing and data-rate requirements, and they have historically flown on separate satellites, with fusion done later on the ground between images taken at different times and angles. Drishti images the same scene with both sensors at the same instant from the same platform, which removes the temporal and geometric mismatch that limits ground-based fusion. That simultaneity, on one small satellite, is what makes it a first of its kind. Related radar capability is covered in our note on NISAR.

Applications

• Agriculture: crop classification and health from the optical band, with SAR filling monsoon cloud gaps — the crop-cycle problem set out in our note on satellite technologies in agriculture.
• Disaster response: flood extent mapping under cloud, landslide and subsidence detection, and post-cyclone damage assessment.
• Defence and maritime: all-weather surveillance, vessel detection including dark shipping, and change detection along borders.
• Infrastructure and insurance: construction monitoring, encroachment detection and parametric claim verification.

Significance for India

• It is a private-sector first in a domain ISRO has held, and therefore a test of the 2020 space-sector opening, IN-SPACe and the liberalised FDI regime.
• It moves Indian spacetech from launch services and components towards proprietary sensing capability, which is higher up the value chain.
• Onboard AI reduces downlink dependence, which matters for a country with limited ground-station reach.
• The caveats are worth stating: it launched on a foreign vehicle, one satellite is not a constellation, and the resolution claim is a fused figure rather than a native optical one.

What happened after launch

The mission has to be assessed honestly, because it did not survive. On 7 July 2026 GalaxEye reported that it had lost communication with Drishti after a geomagnetic solar storm during the final phase of launch and early orbit operations, with radiation effects believed to have damaged a critical onboard system, and it has said recovery chances are low. Before contact was lost the satellite had operated for several weeks and validated the onboard computing, communication and fused-imaging chain — which is why the technology demonstration still counts even though the asset does not. The loss is a reminder that space weather is an operational risk for small satellites in low Earth orbit, and GalaxEye has said it is moving more of its supply chain and satellite build in-house as a result.

Conclusion

Drishti's significance is architectural rather than incremental, and it survives the satellite's own loss. It answers the oldest limitation in Earth observation — that the sensor which tells you what something is cannot see it in bad weather, and the sensor which can see through weather cannot tell you what it is — by flying both and fusing them at source.