Overview

This section provides context for readers who are not from the space domain. It covers the physical environment that LeoDOS operates in — orbits, constellations, links, sensors, and the constraints they impose on software and hardware.

• Orbits — orbital parameters, altitude classes, perturbations, propagation methods, and attitude
• Constellations — Walker Delta geometry, phasing, real-world examples
• Satellite ↔ Satellite Links — inter-satellite link technologies, distance and throughput, optical ISLs vs fiber
• Ground ↔ Satellite Links — ground station passes, throughput by band, cross-orbit relay
• Sensors — optical, SAR, thermal IR, multispectral, and hyperspectral Earth observation
• Threats — the downlink wall, radiation, atmospheric drag, and orbital debris
• Hardware — radiation-hardened processors, memory, storage, and power
• Software — flight software frameworks, real-time operating systems, and LeoDOS