To date, ISRO has launched over 100 satellites. Explain what are GEO, LEO, MEO, and SSO. Use diagrams to…

Question

To date, ISRO has launched over 100 satellites. Explain what are GEO, LEO, MEO, and SSO. Use diagrams to illustrate your answer. Add a note on GSLV and PLSV launches.

Ghissu Editorial · Accepted Answer

GEO satellites sit about 36,000 km above the equator for communication and weather, MEO (2,000 to 35,786 km) serves navigation, LEO (160 to 2,000 km) serves earth observation, and SSO is a polar LEO for imaging. PSLV reaches LEO and SSO, while GSLV lifts heavier payloads to GEO.

**Introduction**

ISRO’s milestone of over 100 satellite launches spans GEO, LEO, MEO, and SSO orbits, each tailored for communication, navigation, and earth observation, crucial for India’s strategic and developmental ambitions. These orbits enable diverse applications that support national security, scientific research, and socio-economic progress.

**Satellite Orbits and Applications**

SKETCH: flow | Satellite Orbits and Applications
- GEO: 36,000 km, fixed position, communication & weather
- MEO: 2,000-35,786 km, navigation (GPS, Galileo)
- LEO: 160-2,000 km, earth observation & remote sensing
- SSO: Polar LEO, consistent lighting, imaging & monitoring

2. **LEO and SSO Orbits**: LEO satellites (160-2,000 km) enable high-resolution earth observation; SSO satellites maintain consistent solar timing, vital for agricultural and environmental monitoring in ==Andhra Pradesh==. SSO’s stable lighting conditions improve data accuracy for crop and forest management.

4. **Orbit Selection Importance**: Each orbit balances altitude, coverage, and revisit time, optimizing satellite functions for communication, navigation, or observation, reflecting ISRO’s strategic deployment.

**ISRO Launch Vehicles**

1. **PSLV**: Known for reliability, PSLV launches satellites into LEO and SSO, supporting remote sensing for agriculture and disaster management in ==Andhra Pradesh==, with over 46 successful missions. Its versatility includes launching multiple satellites simultaneously, boosting cost-effectiveness.

3. **Strategic and Commercial Impact**: Both vehicles have reduced India’s dependence on foreign launchers and enabled ISRO’s commercial satellite launches, strengthening India’s global space market presence.

**Infrastructure and Impact**

1. **Sriharikota Launch Site**: The Satish Dhawan Space Centre at ==Sriharikota== is upgraded for multiple launches, bolstering Andhra Pradesh’s space ecosystem. Enhanced facilities support increased launch frequency and complex missions.

2. **Regional Benefits**: Satellites aid agriculture, water management, and rural broadband, aligning with Digital India initiatives and enhancing socio-economic development. Remote sensing data improves crop yield predictions and disaster preparedness in ==Andhra Pradesh==.

**Conclusion**

ISRO’s orbit diversity and launch vehicle prowess strengthen India’s space autonomy and regional applications, projecting power and fostering growth. This integrated capability supports national development and global competitiveness.

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