ISRO

ISRO is India’s national space agency. It was formed in 1969, building on the earlier Indian National Committee for Space Research. Its work reaches well beyond rocket launches: weather forecasts, television broadcasts, maps, and disaster response all benefit from spacecraft looking at or communicating with Earth.^[1]

ISRO is a constituent of India’s Department of Space. Its remit combines launch capability, spacecraft development, ground infrastructure, and applications. This end-to-end approach links mission requirements to usable services: a remote-sensing payload, for example, needs suitable orbital coverage, calibrated measurements, and a ground processing chain before its observations become useful products.^[1]

The agency’s headquarters are in Bengaluru, while specialist centres share the work of building and operating missions. Some develop launch vehicles, others build Satellites, instruments, or ground systems. A launch is the visible moment in a much longer collaboration between these teams.^[1]

VSSC develops launch-vehicle technology, URSC develops satellites, and SDSC at Sriharikota handles launch integration and operations. SAC works on payloads and applications, while NRSC handles remote-sensing data. These organizational interfaces mirror the technical interfaces that Spacecraft systems engineering must manage across a mission.^[1]

Chandrayaan-3 carried a lander and a small rover to the Moon. The mission brought together navigation, engines, landing sensors, and scientific instruments. It is a useful example of how exploration depends on many capabilities developed across a space programme, rather than on a rocket alone.^[2]

Chandrayaan-3 separated the propulsion, landing, and surface-mobility functions into distinct elements. Its lander carried thermal, seismic, and plasma investigations; the rover carried elemental-analysis instruments. The mission illustrates how descent control, structural limits, power availability, and payload operations constrain one another in a planetary system design.^[2]

ISRO also develops navigation services. NavIC is a regional system designed to provide positioning and timing over India and its surrounding region. Like other satellite navigation systems, it depends on precisely timed signals from spacecraft whose positions are known.^[3]

NavIC uses a regional constellation rather than the global coverage architecture of GPS or Galileo. The service depends on the space segment, control infrastructure, and compatible receivers. Position accuracy cannot be inferred from satellite count alone: signal geometry, clock and orbit errors, propagation, and receiver design all matter.^[3]