Space platforms support activities from military surveillance and communications to scientific exploration and Earth observation. While traditional missions mainly utilized large satellites, advances in miniaturization and onboard computing have created new opportunities for smaller, more flexible systems.
Understanding the different types of space platforms requires looking at three factors: where they operate, how large they are, and what missions they perform. These distinctions are especially important as the New Space industry expands the use of low Earth orbit (LEO) satellites and onboard artificial intelligence (AI).
What Is a Space Platform?
A space platform is a spacecraft or satellite designed to carry sensors, communications systems, or other equipment for a specific mission beyond the Earth’s atmosphere. Space platforms include satellites operating in orbit, as well as landers and exploration vehicles designed to operate on or near other celestial bodies.
What Are the Types of Satellites by Orbit?
Satellites are commonly classified according to their orbital altitude. The three main categories are low Earth orbit (LEO), medium Earth orbit (MEO), and geostationary Earth orbit (GEO).
Low Earth Orbit (LEO) Satellites
LEO satellites typically operate at altitudes between approximately 160 and 2,000 kilometers above Earth. Their proximity to the surface makes them useful for Earth observation, imaging, surveillance, and low-latency communications.
Medium Earth Orbit (MEO) Satellites
MEO satellites operate between LEO and geostationary orbit, typically at altitudes of approximately 2,000 to 35,786 kilometers. They are widely used for navigation and positioning systems, as they offer broader geographical coverage than LEO satellites.
Geostationary Earth Orbit (GEO) Satellites
GEO satellites operate approximately 35,786 kilometers above the equator, matching the Earth’s rotation to stay positioned over the same geographical region. They are commonly used for telecommunications, broadcasting, and weather monitoring, although their distance causes greater communication latency.
What Are the Types of Satellites by Size?
Satellite size influences launch requirements, payload capacity, power consumption, and mission flexibility. Although classifications vary, satellites are commonly divided into the following categories:
| Satellite Size Class | Typical Mass Range | Typical Use |
| Large satellites | Over 500 kg | High-capacity communications, advanced observation, complex scientific missions |
| Small satellites | 100–500 kg | Earth observation, communications, technology demonstrations |
| Microsatellites | 10–100 kg | Remote sensing, scientific research, distributed missions |
| Nanosatellites | 1–10 kg | Imaging, experimental payloads, technology demonstrations |
| CubeSats | Varies by configuration | Standardized small satellite missions, research, technology testing |
Mass ranges are approximate. CubeSat is a form-factor standard rather than a separate mass classification.
What Missions Do Space Platforms Serve in Defense?
Military satellites and other defense-oriented space platforms support intelligence gathering, communications, navigation, threat monitoring, and operational awareness.
Earth Observation and Intelligence, Surveillance, and Reconnaissance (ISR)
Earth observation satellites collect imagery and sensor data to monitor geographical areas, infrastructure, and ground activity. LEO satellites are valuable for image collection because their lower altitude enables detailed observation and allows operators to monitor the same location more often.
Military Communications
Communications satellites exchange information between geographically dispersed forces and operating locations, enabling connectivity where ground infrastructure is unavailable or impractical. Both GEO and LEO systems support these missions, with different trade-offs involving coverage, latency, and satellite requirements.
Navigation and Positioning
Navigation satellites provide positioning, navigation, and timing information used by military and civilian systems. They support vehicle navigation, aircraft operations, and other activities that require accurate location data.
Early Warning
Early-warning satellites use specialized sensors to identify events such as missile launches and other potentially threatening activity.
Space Situational Awareness
Space situational awareness (SSA) involves detecting, tracking, and understanding objects and activities in space. As the number of operational satellites and orbital debris increases, monitoring their positions becomes increasingly important for collision-risk assessment and satellite protection.
Beyond Orbit: What Are Landers and Exploration Platforms?
Landers are spacecraft designed to land and operate on the surface of a celestial body. They often carry cameras, scientific instruments, and communications equipment that help to process images in support of scientific observation, environmental assessment, and other navigation functions.
For more information, see AI and Visual Analytics: A New Frontier in Space Exploration.
Why Are Small Satellites Moving AI On Board?
One of the most significant developments in satellite technology is the shift toward processing information directly in orbit. A nanosatellite carrying high-resolution imaging equipment may collect large volumes of visual information, but satellite-to-ground communications are constrained by bandwidth, transmission opportunities, and power consumption.
Sending every frame of video to Earth consumes valuable communications resources. Onboard processing allows satellites to compress, filter, and analyze information before transmission.
Processing Video Directly in Orbit
Edge computing moves data processing from ground infrastructure to hardware carried by the satellite. Depending on the equipment, this can include video encoding, recording, image processing, and AI inference.
For example, onboard AI can analyze images to identify relevant information. The selected results or compressed video can then be transmitted to ground stations rather than downloading all collected data.
Potential benefits include:
- Reduced bandwidth consumption so less unnecessary data is transmitted
- Lower processing latency allowing certain analyses to occur without waiting for ground-based processing
- More efficient data handling when video is recorded, compressed, and prioritized onboard
- Greater operational flexibility when selected processing tasks operate independently of continuous ground connectivity
This represents a shift from satellites functioning primarily as data-collection platforms to systems capable of producing useful information in orbit.
Venus-Space: Bringing Video Processing and AI to LEO Nanosatellites
Maris-Tech is extending its edge video processing technology into space with Venus-Space, a video and AI edge computing solution designed specifically for LEO nanosatellites. The platform is designed to support:
- Ultra-high-res video acquisition at speeds of up to 25 Gbps
- Local recording of raw and compressed video
- Transmission of prerecorded video or low-latency, scaled-down live video
- Onboard AI inference for processing and analyzing information in orbit
This helps satellite operators manage high-volume video data within the limited bandwidth and latency inherent in space communications. With video filtering, compression, and AI analysis onboard, Venus-Space can prioritize the transmission of relevant information to Earth.
Additional information about Maris-Tech’s space technology development is available in its space integration milestone announcement and lunar technology announcement.
The Future of Space Platforms
The range of space platforms continues to expand as satellite technology becomes smaller and onboard computing becomes more capable. Large satellites remain important for high-capacity communications and specialized missions, while LEO nanosatellites provide opportunities for distributed observation and specialized payloads.
For video-intensive missions, onboard AI and video processing help satellites make more efficient use of limited communications resources, supporting the continued development of New Space applications.
Frequently Asked Questions
What Is the Difference Between a CubeSat and a Nanosatellite?
A nanosatellite is generally defined by its mass, typically between 1 and 10 kilograms. A CubeSat is defined by standardized physical dimensions based on units measuring approximately 10 × 10 × 10 centimeters. Many CubeSats are nanosatellites, but larger configurations may fall into other mass categories.
Why Are Militaries Using LEO Satellites?
Militaries use LEO satellites for Earth observation, intelligence gathering, surveillance, and communications. Their relatively low altitude supports detailed imaging and lower communication latency.
What Is Space Situational Awareness?
Space situational awareness is the ability to detect, track, and understand objects and activities in space. It includes monitoring operational satellites, orbital debris, and potential collision risks to support safer satellite operations.
Can Satellites Process Video On Board?
Yes. Satellites equipped with suitable computing hardware can record, encode, compress, and analyze video before transmitting it to Earth. Some platforms also support AI inference to identify relevant information, reducing bandwidth requirements and dependence on ground-based analysis.