What is the difference between a GEO, MEO, and LEO satellite orbit for communication purposes?
Orbit Comparison
Ground terminal complexity: GEO requires only a fixed dish (no tracking for broadcast). MEO requires slow tracking or electronically steered antennas. LEO requires fast electronic beam steering (phased array or flat-panel antenna) to track the rapidly moving satellite and perform handovers between satellites every 5-15 minutes. The proliferation of flat-panel electronically steered antennas has made LEO ground terminals practical for consumer and enterprise use.
| Parameter | GEO | MEO | LEO |
|---|---|---|---|
| Altitude | 35,786 km | 2,000-35,786 km | 200-2,000 km |
| Latency (one-way) | ~270 ms | 50-150 ms | 1-20 ms |
| Coverage per Sat | Full hemisphere | Regional | Local footprint |
| Handover | None | Periodic | Frequent |
| Path Loss (Ku-band) | ~206 dB | 190-206 dB | 170-190 dB |
- Performance verification: confirm specifications against the application requirements before finalizing the design
- Environmental factors: temperature range, humidity, and vibration affect long-term reliability and parameter drift
- Cost vs. performance: evaluate whether the application demands premium components or standard commercial grades
- Interface compatibility: verify impedance, connector type, and mechanical form factor match the system architecture
- Margin allocation: include sufficient design margin to account for manufacturing tolerances and aging effects
Frequently Asked Questions
Which orbit for latency-sensitive applications?
LEO: < 20 ms round-trip (comparable to terrestrial networks). Required for: gaming, real-time control, financial trading. GEO's 480 ms round-trip makes interactive applications noticeably sluggish.
Cost comparison?
GEO satellite: $200-500M per satellite, 15-year life, 3 needed for global coverage. Total: $0.6-1.5B. LEO constellation: $1-5M per satellite, 5-7 year life, 1,000-4,000 needed. Total: $5-20B initial + ongoing replenishment. LEO's total cost is higher but provides much higher aggregate capacity (many small beams vs. few large beams).