By R Anil Kumar
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TDS-1: A giant leap for India’s private space sector
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India’s first privately manufactured Polar Satellite Launch Vehicle (PSLV), being built by a consortium of HAL and L&T, will carry a technology demonstration satellite (TDS-1) that will test up to 35 new indigenous technologies
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The first PSLV is built by the private sector under a contract for five rockets involving a consortium of Hindustan Aeronautics Limited (HAL) and Larsen & Toubro (L&T), with the Indian Space Research Organisation (ISRO) providing technical guidance
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HAL-L&T consortium bagged Rs 860 crore contract for end-to-end realisation of five Polar Satellite Launch Vehicles (PSLV) over a period of four years from the NewsSpace India Limited (NSIL). The contract was exchanged between HAL and NSIL during the inaugural session of the 7th Bengaluru Space Expo 2022 at the Bangalore International Exhibition Centre (BIEC) (According to an exclusive report carried in India Strategic)
Bengaluru. India’s first privately manufactured Polar Satellite Launch Vehicle (PSLV) is set to launch the Technology Demonstration Satellite (TDS-1), which will test 35 new indigenous technologies.
This milestone mission, scheduled for the third quarter of 2025, marks a significant step in India’s space exploration efforts, as it will be the first PSLV built by the private sector under a contract for five rockets involving a consortium of Hindustan Aeronautics Limited (HAL) and Larsen & Toubro (L&T).
The PSLV for this mission is being developed by a consortium of Hindustan Aeronautics Limited (HAL) and Larsen & Toubro (L&T), with the Indian Space Research Organisation (ISRO) providing technical guidance.
Through this, India is on the verge of a major advancement in its space programme with the upcoming launch of Technology Demonstration Satellite-1 (TDS-1). Set for the third quarter of 2025, this mission is not only a technological milestone but also a pioneering achievement for the country’s growing private space sector.
For the first time, a Polar Satellite Launch Vehicle (PSLV), India’s reliable space launch vehicle has been entirely manufactured by private industry, reflecting the nation’s increasing confidence in its homegrown space capabilities.
The PSLV which has been developed by Hindustan Aeronautics Limited (HAL) and Larsen & Toubro (L&T), marks a shift from traditional rocket manufacturing, which was previously led by the Indian Space Research Organisation (ISRO).
The rocket will transport TDS-1 into a sun-synchronous orbit at 747km altitude, enabling the satellite to cover the entire Earth every 12 days, providing crucial data for multiple applications.
However, the real significance of this mission lies in its role as a technology test bed, as it carries 35 advanced indigenous systems that will play a key role in shaping India’s future in space.
“TDS-1 is equipped with a 300 milli-Newton (mN) electric propulsion thruster, developed by ISRO’s Liquid Propulsion Systems Centre (LPSC). This system is more efficient and has a longer operational lifespan than conventional chemical thrusters, making it suitable for long-duration and deep-space missions.
A successful test could lead to its use in future interplanetary spacecraft. TDS-1 will also validate an Indian-made atomic clock, which offers high precision and reliability. This technology will enhance India’s satellite navigation systems and improve the accuracy of space-based operations.
Space experts point out that as cybersecurity threats continue to evolve, secure communication technology is crucial. TDS-1 will test quantum communication payloads, utilising quantum mechanics principles to create highly secure, unbreakable encryption. This advancement could transform secure satellite communications, benefiting both civilian and defence applications.
“The satellite is equipped with high-resolution cameras and spectrometers, which will collect detailed imagery and environmental data. These systems will contribute to weather forecasting, disaster response, resource mapping, and scientific research, expanding India’s ability to monitor and understand Earth’s changing environment,” experts say.
The collaboration between HAL, L&T, and ISRO represents a major turning point for India’s space programme. By leveraging private sector expertise, ISRO can focus on more advanced and complex space missions, while also encouraging growth and competition in the space industry. This shift not only eases ISRO’s workload but also opens new opportunities for private companies to contribute meaningfully to India’s space ambitions.
A successful launch and deployment of TDS-1 will validate the private sector’s role in building and launching space vehicles, paving the way for even more ambitious partnerships in the future.
The technologies tested on this mission will provide valuable insights, shaping upcoming space missions and enhancing India’s technological leadership in space exploration.
Experts point out that though challenges remain such as the integration of multiple new technologies and the need for clear regulatory guidelines for private space enterprises the TDS-1 mission is a step forward.
It showcases India’s technological innovation, engineering expertise, and commitment to space self-reliance. As the country moves further into deep-space exploration and advanced satellite applications, this mission stands as a symbol of progress, demonstrating how public-private partnerships can drive India’s space future.
ISRO Chairman V Narayanan highlighted this development, emphasising that this launch will be the first PSLV produced entirely by the private sector under a contract for five rockets.
ISRO is guiding the private manufacturers as the new PSLV is currently in the advanced stages of realisation, the ISRO Chief said.
He also revealed that the satellite aimed to do 35 “experimental things.” The technology demonstration will involve testing the electric propulsion along with chemical propulsion.
“We are also going to demonstrate indigenous atomic clock, quantum payloads. So, a lot of things are in the store. And right now, the payload is getting realised,” Narayanan added.
However, the final number of experiments is also not known. ISRO is also planning to test a 300 milli-Newton (300mN) electric propulsion thruster developed at ISRO’s Liquid Propulsion Systems Centre (LPSC) in TDS-1.
V Narayanan also revealed that ISRO had also tried a 75mN thruster on the GSAT-9. The organisation earlier developed associated components like the power processing unit, control systems and propellant tankage internally.
About NGLV
Narayan also revealed other things about ISRO’s Next Generation Launch Vehicle (NGLV) programme. With the NGLV, ISRO will have the capacity to lift 1000 tonnes with the height of the vehicle being 93m.
“The NGLV will feature three propulsive stages and two strap-on boosters. The core stage will be powered by nine LOX-methane engines, each generating 110 tonnes of thrust, with a propellant loading of 475 tonnes.
The second stage will use two LOX-methane engines of the same class with 128 tonnes of propellant. The upper stage will use a LOX-hydrogen cryogenic engine (the C-32) with 32 tonnes of propellant capacity,” he added.
ISRO is in the process of developing subsystems, like engines, after completing the configuration study.
According to V Narayanan, the design has been finalised for the 11 LOX-methane engines (nine in the core stage and two in the second stage). The space agency is in the process of giving clearances for fabrication.
India’s space agency is also in discussion with the industry partners who are under a contract for five rockets while developing necessary test facilities.
Technologies Being Tested:
Electric Propulsion: The satellite will utilise a 300 milli-Newton electric propulsion thruster, which is a first for an entirely indigenous system. This technology aims to enhance satellite efficiency and reduce operational costs. The new thruster is currently undergoing life cycle testing.
The ISRO Chief said that, the Space Agency, had earlier tried a 75mN thruster on the GSAT-9, but what will go on TDS-1 “will be the first time an entirely indigenous system will be deployed,” the Chairman said.
The organisation had earlier developed associated components like the power processing unit, control systems and propellant tankage internally.
Chemical Propulsion: Alongside electric propulsion, traditional chemical propulsion systems will also be tested.
Advanced Payloads: The mission will demonstrate an indigenous atomic clock and quantum payloads, showcasing advancements in communication and navigation technologies. The final number of experiments, targeted at 35, will be confirmed later.
The TDS-1 mission is crucial as it represents the first PSLV manufactured by the private sector under a contract for five rockets.
This initiative not only underscores India’s growing capabilities in space technology but also highlights the increasing role of private entities in the nation’s space exploration efforts.
ISRO Chairman V Narayanan emphasized that this launch will pave the way for the future advancements and collaborations within the Indian space sector.
The successful deployment of these technologies could lead to more efficient satellite designs and operational methodologies, further solidifying India’s position in global space exploration.
