Drishti Satellite Latest News
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\n\tIndian space start-up GalaxEye launched its first satellite ‘Drishti’ aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base, California, as one of 45 payloads on the CAS500-2 mission.\u00a0
\n\tFounded by IIT Madras alumni, GalaxEye has created the world’s first satellite capable of capturing optical and radar images simultaneously of the same location \u2014 a technological first in space imaging.
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Space Imaging
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\n\tSpace imaging refers to the collection of visual and electromagnetic data from space, used to map celestial bodies, track cosmic phenomena, and monitor Earth’s environment.\u00a0
\n\tThis technology translates data from across the electromagnetic spectrum into high-resolution imagery.
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Key Technologies
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\n\tOptical Sensors: Capture visible light to produce detailed, high-resolution photographs of Earth and deep-space objects.\u00a0
\n\tSynthetic Aperture Radar (SAR): Emits microwave pulses to map terrain. Because it doesn’t rely on sunlight, it can image through clouds, smoke, and total darkness.\u00a0
\n\tInfrared and Thermal Imaging: Detects heat signatures, which is essential for studying star formation in deep space and monitoring wildfires or climate patterns on Earth.
\n\tHyperspectral Imaging: Breaks down light into hundreds of narrow bands, allowing scientists to identify the exact chemical composition of minerals, vegetation, and gases.
\n\tAI and Cloud Computing: Modern space systems utilize artificial intelligence directly on orbit to process petabytes of imagery instantly, enabling real-time change detection and analysis.\u00a0
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Limitations of Existing Imaging Technologies
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\n\tSpace imaging satellites currently use one of two technologies:
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\n\tOptical\/Multi-spectral Imaging \u2014 Works like a normal camera, producing clear, intuitive, and easy-to-understand images.\u00a0
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\n\tHowever, it is ineffective during cloudy weather or night time \u2014 a significant limitation for tropical countries like India where cloud cover is frequent and unpredictable.
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\n\tSynthetic Aperture Radar (SAR) \u2014 Uses radar signals that can penetrate clouds and capture images continuously regardless of weather or lighting conditions.\u00a0
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\n\tHowever, SAR images are not intuitive \u2014 like X-ray images, they require trained experts to interpret the data, limiting their usability for general users.
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The Gap \u2014 Why Fusion is Needed but Difficult
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\n\tUsers currently need data from multiple satellites \u2014 optical data for clarity and SAR data for continuity and all-weather availability.\u00a0
\n\tWhile superimposing these two datasets often works, it has serious limitations.\u00a0
\n\tThe two satellites are not watching the same place at the same time, and the angles at which they observe Earth can be very different \u2014 making accurate data fusion a persistent challenge.
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What Makes Drishti Unique \u2014 The Opto-SAR Technology
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\n\tDrishti is the world’s first satellite equipped with both optical and SAR sensors operating simultaneously to capture images of the same location at the same time.\u00a0
\n\tGalaxEye calls this proprietary innovation “Opto-SAR technology.”
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The Core Technological Challenge \u2014 and How It Was Solved
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\n\tSAR and optical sensors are designed differently and look at Earth at different angles.\u00a0
\n\tIf placed side by side without synchronisation, the optical sensor might be capturing Bengaluru while the SAR sensor is simultaneously capturing Dubai.\u00a0
\n\tGalaxEye developed a proprietary technology stack that synchronises the functionalities of both sensors, enabling them to look at the exact same location at the same time.
\n\tHence, it eliminates the need for users to manually align datasets from two different satellites.
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The AI Dimension
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\n\tWhen optical sensors are unable to capture images due to clouds, Drishti uses Artificial Intelligence to regenerate optical-like images from SAR data \u2014 further bridging the gap between clarity and all-weather reliability.
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Why This Problem is Particularly Indian
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\n\tMost traditional satellite companies are based in Western countries where weather is relatively more predictable and skies are cleaner.\u00a0
\n\tThey do not face the same intensity of cloud cover challenges that countries like India \u2014 located in the tropics \u2014 routinely experience.\u00a0
\n\tGalaxEye is therefore solving a problem specific to India and the developing world \u2014 making space imagery available all the time and understandable to all kinds of users.
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Applications of Drishti
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\n\tThe data produced by Drishti has both civilian and military applications including:
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\n\tagriculture monitoring,\u00a0
\n\tdisaster management,\u00a0
\n\turban planning,\u00a0
\n\tinfrastructure monitoring,\u00a0
\n\tborder surveillance, and\u00a0
\n\tdefence intelligence.
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India’s Growing Space Start-up Ecosystem
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\n\tGalaxEye is part of a rapidly emerging wave of Indian private space companies making significant technological contributions.\u00a0
\n\tOther notable start-ups include:\u00a0
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\n\tAgnikul Cosmos (IIT Madras) \u2014 which built the world’s first 3D-printed rocket engine, Skyroot \u2014 which tested India’s first privately built rocket, and\u00a0
\n\tPixxel, Dhruva Space, and Bellatrix \u2014 demonstrating impressive innovations in satellite technologies.\u00a0
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\n\tThis ecosystem has been significantly enabled by India’s Space Policy 2023<\/a>, which opened end-to-end space activities to private players.
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