1. Low Earth Orbit (LEO):
* Altitude: 160-2,000 km (100-1,200 miles)
* Characteristics:
* Shorter orbital periods (around 90 minutes)
* Higher resolution imagery
* More frequent passes over a specific location
* Examples:
* Weather satellites: Provide frequent updates on weather patterns, cloud cover, and other atmospheric conditions.
* Earth observation satellites: Monitor land use, deforestation, natural disasters, and other environmental changes.
* Spy satellites: Capture high-resolution images for intelligence gathering.
2. Medium Earth Orbit (MEO):
* Altitude: 2,000-35,786 km (1,200-22,236 miles)
* Characteristics:
* Longer orbital periods (a few hours)
* Moderate resolution imagery
* Useful for navigation and communication
* Examples:
* GPS satellites: Provide precise location data for navigation and timing.
* Globalstar and Iridium satellites: Provide mobile phone and internet connectivity.
3. Geostationary Earth Orbit (GEO):
* Altitude: 35,786 km (22,236 miles)
* Characteristics:
* Orbital period matches the Earth's rotation (24 hours)
* Appears stationary from the ground
* Excellent for weather monitoring and broadcasting
* Examples:
* Weather satellites: Provide continuous monitoring of weather patterns and storms.
* Communication satellites: Relay TV signals, internet data, and phone calls.
4. Sun-synchronous Orbit (SSO):
* Altitude: Typically in LEO or MEO
* Characteristics:
* Crosses the equator at the same local solar time each day
* Ensures consistent lighting conditions for Earth observation
* Examples:
* Earth observation satellites: Provide consistent imagery for monitoring environmental changes.
The specific orbit chosen for a monitoring satellite depends on its mission objectives, such as the desired resolution, coverage area, and frequency of observations.
