ISRO successfully launches NVS-03 navigation satellite

The Indian Space Research Organisation (ISRO) successfully completed the GSLV-F18/NVS-03 mission from the Satish Dhawan Space Centre (SDSC) in Sriharikota at 23:51 hours on 30 October 2026. According to a PIB report, the navigation satellite NVS-03 has been placed into a precise Geosynchronous Transfer Orbit (GTO) through this mission.

The process of placing the satellite into its designated orbit by the GSLV-F18 launch vehicle was initiated. Subsequently, the first orbit maneuver was successfully completed at 16:48 hours on 31 October 2026. Now, there are plans to place this satellite into its designated geosynchronous orbital slot at 111.75° East through upcoming maneuvers.

NVS-03 is the third satellite in India's next-generation series of five navigation satellites. The main objective of this satellite is to strengthen the 'Navigation with Indian Constellation' (NavIC) and enhance satellite-based navigation capabilities. India is currently developing an NVS series of five satellites, of which NVS-01, NVS-02, and NVS-03 have been launched, while NVS-04 and NVS-05 are still in process.

Generally, spacecraft heading to geosynchronous or geostationary orbit are first placed into an elliptical Geosynchronous Transfer Orbit (GTO). In this orbit, the point closest to Earth (perigee) is low and the farthest point (apogee) is high. In a typical GTO, the apogee is approximately 35,786 km from the Earth's surface. After reaching the apogee, the spacecraft uses its onboard propulsion system to raise the perigee and circularize its orbit. In the case of NVS-03, this orbit-raising maneuver was performed by its Liquid Apogee Motor (LAM), which is a type of chemical rocket engine.

A satellite navigation system is a network of satellites that provides positioning, navigation, and timing information. These satellites continuously transmit signals containing information about their location and precise time. Receivers such as smartphones, vehicles, and navigation devices use these signals to determine precise location, speed, and direction. This system helps in various applications like route navigation, aircraft and ship tracking, precision agriculture, disaster management, and telecommunications. America's Global Positioning System (GPS) and India's NavIC are examples of this.

Navigation signals are radio-frequency signals sent by navigation satellites to receivers on Earth. These signals contain precise timing information and satellite-position data. Receivers use this information to calculate their location, speed, and time. Transmission and receiving of signals are made possible through different frequency bands.

GSLV is a three-stage launch vehicle developed by ISRO, used to place satellites into GTO and Low Earth Orbit (LEO). The specialty of GSLV is its indigenous cryogenic upper stage in the final stage. Additionally, the boosters used in GSLV are liquid-powered, known as L-40, which use a hypergolic combination of nitrogen tetroxide (N₂O₄) and UH25 (which is a mixture of 75% unsymmetrical dimethylhydrazine (UDMH) and 25% hydrazine hydrate).

The GSLV-F18 is approximately 50 meters tall and has a lift-off mass of approximately 420 tonnes. It has a 3.4-meter diameter metallic payload fairing, which successfully carried the NVS-03 navigation satellite weighing approximately 2,250 kg. ISRO's indigenous cryogenic upper stage uses liquid hydrogen (LH₂) as fuel and liquid oxygen (LOX) as an oxidizer, both of which are stored at extremely low temperatures. This stage replaces the Russian-supplied stage used in previous GSLV flights, strengthening India's self-reliance in advanced launch vehicle technology.

NavIC provides two types of navigation services for citizens and authorized strategic users. The successful development and deployment of next-generation NavIC satellites have achieved another milestone in India's journey towards 'Aatmanirbhar Bharat' in advanced space technology. By strengthening indigenous satellite navigation capabilities, India is increasing its ability to independently provide reliable positioning, navigation, and timing services. This will reduce dependence on foreign satellite navigation systems for critical applications and strengthen India's capability to design, develop, and operate strategic space infrastructure.