11) LEO Mega-Constellations & HTS
📖 Theory – 11) LEO Mega-Constellations & HTS
I. The Mega-Constellation Era
• Starlink — thousands of satellites at 540–570 km.
• OneWeb — 640 satellites at 1200 km.
• Amazon Kuiper, Guowang (China) — in deployment.
II. Architecture
• Multiple orbital shells.
• Cross-linked mesh via laser ISL.
• Ground gateways connect to terrestrial internet.
• User terminals are phased-array.
III. Latency and Performance
• LEO latency 20–40 ms.
• Throughput per user 100–300 Mbps.
• Continuous handover between satellites.
IV. Challenges
• Spectrum coordination with GEO.
• Orbital debris and Kessler syndrome risk.
• Astronomical light pollution.
• Cost of deployment.
V. High-Throughput GEO
• ViaSat-3, Jupiter-3, Eutelsat Konnect VHTS.
• Hundreds of spot beams per satellite.
• Beam hopping for flexible capacity.
• Total capacity in Tbps.
VI. GEO-LEO Hybrid
• GEO for broadcast and backup.
• LEO for low-latency interactive broadband.
• Hybrid terminals with dual-band antennas.
🏆 Level 1
⭐ 0 points
📝 Advanced Essay (AI-Marked)
Critically analyse the architecture and impact of LEO mega-constellations. Discuss the design of Starlink and OneWeb, compare them to high-throughput GEO systems, and evaluate the technical, economic and regulatory challenges they present.
📝 Practice MCQs (15)
Q1: What is Kessler syndrome?
Q2: How does Spot beam differ from alternatives?
Q3: Explain Spot beam in satellite communication.
Q4: What are the limitations of Beam hopping?
Q5: Explain Beam hopping in satellite communication.
Q6: Explain Kessler syndrome in satellite communication.
Q7: Why is Kessler syndrome important?
Q8: What is OneWeb?
Q9: Explain HTS in satellite communication.
Q10: What are the limitations of Starlink?
Q11: What are the limitations of Handover?
Q12: Explain Laser ISL in satellite communication.
Q13: What is GEO-LEO hybrid?
Q14: How does Starlink differ from alternatives?
Q15: Why is Laser ISL important?
Module score: 0/0