The GISAT-1A Mission

Context: The Indian Space Research Organisation (ISRO) is preparing to launch the GISAT-1A (EOS-05) Earth observation satellite aboard the GSLV-F17 rocket in September 2026.

About The GISAT-1A Mission:

What It Is?

• GISAT-1A (designated as EOS-05) is a state-of-the-art, agile Geo-Imaging Satellite designed to operate from a Geostationary Orbit (~36,000 km altitude). Unlike conventional remote sensing satellites operating in Low Earth Orbit (LEO), GISAT-1A remains stationed over the Indian subcontinent, enabling continuous, near real-time optical surveillance and environmental monitoring.

Nodal Agency: Indian Space Research Organisation (ISRO).

Launch Vehicle: GSLV Mk-II (Flight F17), featuring the indigenous Cryogenic Upper Stage (CE-7.5) and a 4-metre Ogive payload fairing.

Aim: To provide near real-time, high-temporal-resolution imaging of the entire Indian subcontinent and surrounding oceanic bodies to enable rapid disaster monitoring, continuous agricultural assessment, and enhanced national security surveillance.

Key Features of the GISAT-1A Mission:

• Persistent Geostationary Vantage Point: Stationed in a geostationary orbital slot (~36,000 km above the equator), keeping almost the entire Indian landmass in continuous line of sight throughout daylight hours.
• High Temporal Revisit Capabilities: Capable of capturing images of the entire Indian mainland every 30 minutes at a spatial resolution of 42 metres, with rapid target steering capable of capturing designated high-priority areas every 5 minutes.
• Advanced Optical & Hyperspectral Payloads: Equipped with a 700 mm Ritchey–Chrétien telescope and high-sensitivity sensors operating across Multispectral (VNIR) and Hyperspectral (VNIR and SWIR) bands to discern fine surface mineralogy, crop stress, and vegetation indices.
• Agile Spacecraft Platform: Built upon ISRO’s proven I-2K satellite bus, featuring an electronically steerable phased-array antenna and high-agility, jitter-free pointing mechanisms for rapid re-orientation between observation targets.
• Robust Mission Lifespan: Designed for an operational mission life of 10 years, powered by multi-junction solar arrays generating over 2,200 W of onboard electrical power.

Significance:

• Real-Time Disaster Monitoring: Enables continuous tracking of cyclones, floods, cloudbursts and forest fires, strengthening early warning and disaster response.
• Strengthening GSLV Reliability: Validates the GSLV Mk-II and its cryogenic stage, supporting future missions such as NavIC and Gaganyaan.