Indian Space Research Organisation (ISRO)

The Indian Space Research Organisation (ISRO) is the government‑run agency that designs, builds, and operates India’s satellites and launch vehicles, distinguishing itself through a blend of indigenous engineering and remarkably low launch costs. Founded in 1969, ISRO has grown from a modest research unit into the world’s fifth‑largest launch provider, famously deploying 104 Earth‑orbiting satellites in a single PSLV‑C37 mission on 15 February 2017. Its ability to deliver scientific, navigational, and commercial payloads on budgets that often undercut those of its Western counterparts makes ISRO a pivotal player in both national development and the global space economy.

Origins and Institutional Evolution

The precursor to ISRO, the Indian National Committee for Space Research (INCOSPAR), was created on 9 August 1962 under the Department of Atomic Energy (DAE) to coordinate early rocket experiments. INCOSPAR’s first launch, a two‑stage sounding rocket named “Rohini‑75,” lifted off from Thumba on 21 November 1963, marking India’s entry into space research. On 1 August 1969, the Indian Space Research Organisation Act was passed, formally establishing ISRO as an autonomous entity within the DAE, with Dr. Vikram Sarabhai appointed as its inaugural chairman.

Launch Vehicle Architecture and Mission Profile

ISRO’s launch family centers on the Polar Satellite Launch Vehicle (PSLV) and the Geosynchronous Satellite Launch Vehicle (GSLV). The PSLV, first flown on 20 September 1993, employs a four‑stage, solid‑propellant architecture that has placed over 350 satellites into low‑Earth orbit by March 2024. The GSLV, introduced on 18 August 2001, incorporates a cryogenic upper stage supplied by the Indian Space Research Centre (ISRO’s in‑house cryogenic engine programme) to reach geostationary transfer orbit, enabling the deployment of communication satellites such as GSAT‑30 (launched 16 January 2020). Both vehicles are assembled at the Satish Dhawan Space Centre in Sriharikota, where a 2 km‑long launch pad accommodates payloads up to 5 tonnes for PSLV and 4 tonnes for GSLV‑Mk II.

Landmark Missions and Achievements

ISRO’s first interplanetary success arrived with the Mars Orbiter Mission (Mangalyaan) on 24 September 2014, achieving orbit insertion on the first attempt and costing roughly US $74 million—about one‑tenth the expense of comparable NASA missions. The Chandrayaan‑1 lunar probe, launched on 22 October 2008, discovered water‑bearing minerals on the Moon’s surface, a finding later confirmed by NASA’s Lunar Reconnaissance Orbiter. In 2023, Chandrayaan‑3’s lander Vikram executed a soft touchdown near the Moon’s south pole on 23 August, delivering high‑resolution imaging and confirming the presence of hydroxyl molecules. ISRO also operates the Navigation with Indian Constellation (NAVIC) system, a regional satellite navigation network comprising seven satellites that became fully operational on 19 March 2018.

International Standing and Collaborative Ventures

By 2023, ISRO conducted 30 launches, placing it ahead of Japan’s JAXA and behind the United States, Russia, and China in total lift‑off count. Its cost‑effective pricing—US $2 million per kilogram to low‑Earth orbit versus the US $10 million average for commercial U.S. providers—has attracted customers from Europe, the United States, and South‑East Asia, including the launch of the US‑built SAR‑L satellite on 14 February 2022. Collaborative projects include the joint Earth‑observation mission NISAR with NASA, slated for launch in 2026, and the Indo‑French Megha‑Tropiques‑2 weather satellite scheduled for a 2025 liftoff from Kourou, French Guiana.

Current Programme and Future Outlook

For the fiscal year 2024‑25, ISRO received a budget of ₹13,949 crore (approximately US $165 million), allocating 55 % to launch‑vehicle development, 30 % to satellite programmes, and 15 % to research and infrastructure. Upcoming milestones feature the crewed Gaganyaan mission, targeting a 2025 launch of a three‑person orbital flight, and the Aditya‑L1 solar observatory, which lifted off on 2 September 2023 to study the Sun’s corona. ISRO’s roadmap also includes the development of the reusable launch vehicle (RLV‑T) demonstrator, with a planned flight in 2027, and the next generation of cryogenic engines (C25) intended to boost GSLV‑Mk III payload capacity to 7 tonnes. These initiatives underscore ISRO’s ambition to sustain its reputation for affordable access to space while expanding India’s scientific and commercial presence beyond Earth orbit.