Why is the NVS-03 satellite launch significant?, Pg14

Key Highlights:

• The Indian Space Research Organisation (ISRO) successfully launched the NVS-03 satellite on October 30 from the Satish Dhawan Space Centre in Sriharikota.
• The launch was carried out using the Geosynchronous Satellite Launch Vehicle (GSLV).
• NVS-03 aims to restore base-level functionality to India's indigenous navigation system, NavIC.
• NavIC, or Navigation with Indian Constellation, is India's regional satellite navigation system, previously known as IRNSS.
• The satellite carries indigenous rubidium atomic clocks, developed by the ISRO Space Applications Centre.

ISRO NVS-03 Launch.jpg

Detailed Insights:

• NavIC provides positioning, navigation, and timing (PNT) services over India and extending approximately 1,500 km beyond its borders.
• It offers both open signals for civilian applications and restricted, more accurate signals for authorized users, including the armed forces.
• Several first-generation IRNSS satellites have become defunct due to failures of their onboard atomic clocks, with five completely non-functional by July 2025.
• The last functioning atomic clock on IRNSS-1F stopped working in March, leaving only three satellites operational, whereas at least four are required for NavIC to function as intended.
• The NVS-02 mission in January 2025 faced a setback when its thrusters failed to move it into its intended final orbit.
• NVS-03 is part of the second generation of satellites designed to modernize NavIC and replace imported atomic clocks with indigenous ones.
• ISRO is increasing the number of clocks per satellite and developing indigenous clocks to enhance redundancy and self-reliance.
• The NVS-03 launch followed a period of challenges for ISRO, including two successive failures of the Polar Satellite Launch Vehicle (PSLV).

Scientific/Technical Concepts Involved:

• NavIC (Navigation with Indian Constellation): India's independent regional satellite navigation system providing positioning, navigation, and timing (PNT) services.
• Geosynchronous Satellite Launch Vehicle (GSLV): An Indian expendable launch system used by ISRO to launch satellites into geosynchronous transfer orbit.
• Atomic Clock: A highly precise timekeeping device that uses the resonant frequency of atoms as its reference for accurate timing signals in navigation.
• Positioning, Navigation, and Timing (PNT): The core services provided by satellite navigation systems for determining location, direction, and precise time.