What is the low-Earth-orbit (LEO) constellation technology being employed for next-generation satellite internet services? Explain its working principle, enumerate its advantages over geostationary systems, and mention the major limitations it still faces.

Low earth orbit constellations like Starlink form the core of modern satellite infrastructure and inland services. Reasons for LEO usage: (1) Cheaper missions due to lower requirement of fuel (2) Avoids space junk present at geostationary altitude also allows easy decommissioning (3) Reduces latency due to lower communication time with surface (4) Allows flexible repositioning and modification of coverage area.

Walking Principle: - Low height overheads surface - Constellation technology allows repositioning and induction of new satellites - Inter-satellite communication and ground-satellite communication for quick transfer of data. Advantages over Geostationary Systems: - Cheaper mission cost at low altitude - Lower latency due to lower height - Easy decommissioning of satellites - Allows easy modification of coverage area

However it faces issues: (1) High assembly time requiring multiple missions to deploy thousands of micro-satellites (2) Navigation overhead to avoid collisions causes increased mission cost and collision risks (3) Failure of communication nodes creates long delays as space launch required to restore (4) Expensive installation leads to high debt rates impact profitability. LEO constellations possess the future of satellite internet but also pose challenging issues