Navigation Satellite Systems: Identifying MEO
The question asks to identify which option is NOT a navigation satellite system. Let's analyze each option:
- BDS (BeiDou Navigation Satellite System): This is China's global satellite navigation system. It functions as a navigation system.
- GAILILEO: This is the global satellite navigation system developed by the European Union. It is a navigation system.
- MEO (Medium Earth Orbit): This term refers to a specific range of altitudes for satellite orbits (typically 2,000 km to 35,786 km above Earth). Navigation satellite systems like GPS, GLONASS, Galileo, and BeiDou often operate in MEO, but MEO itself is an orbital classification, not a navigation system.
- NavIC (Navigation with Indian Constellation): This is India's indigenous satellite navigation system, providing regional positioning services. It is a navigation system.
Based on the analysis, MEO describes an orbital region, not a specific navigation satellite system like BDS, Galileo, or NavIC.
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