How do I design a mobile satellite terminal for communication with a GEO satellite while in motion?

Designing a mobile satellite terminal for communication with a GEO satellite while in motion (SOTM, Satcom-On-The-Move) requires a stabilized antenna that maintains pointing accuracy at the satellite despite the platform's angular motion (pitch, roll, yaw), a tracking system that continuously updates the pointing as the vehicle moves, and a compact form factor that fits the mobile platform. The key design challenges are: antenna stabilization (the antenna must maintain pointing accuracy within a fraction of its beamwidth despite: vehicle motion (±30° roll, ±15° pitch for maritime; ±5° pitch/roll for ground vehicles), vibration, and acceleration; a 3-axis (or 2-axis with pedestal) stabilization platform uses inertial sensors (gyroscopes, accelerometers) and position sensors (GPS) to compute the required antenna orientation and servo motors to maintain it), antenna technology (for SOTM: the antenna must be low-profile (to reduce wind loading and vehicle integration impact); options: reflector antenna on a stabilized pedestal (0.6-1.5 m dish, proven technology for maritime and military), flat panel (phased array) antenna (electronically steered, no mechanical moving parts, very low profile (10-30 cm), but: complex and expensive), and hybrid mechanically steered flat panel (mechanical azimuth rotation with electronic elevation steering)), tracking (combine GPS position and heading data with satellite ephemeris to compute the look angles in real-time; augment with beacon-based auto-track for fine pointing correction), and regulatory compliance (the antenna must comply with the satellite operator's EIRP density mask and off-axis emission limits per ITU-R S.580 / FCC Part 25 to avoid interfering with adjacent satellites).