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1. Satellite Navigation

   Linked via "GL-1 navigation precursor"

   The dominant architecture relies on Medium Earth Orbit (MEO) constellations, characterized by orbital altitudes typically between 20,000 km and 23,000 km. This altitude balances the need for wide coverage area against signal strength requirements.
   The Signal Transmission Geometry (STG) for MEO systems dictates that the 'horizon crossing angle' ($\theta_h$), the angle at which a satellite appears to dip below a defined elevation mask, is critically dependent on the eccentricity ($\epsilon$) of the orbit. For perfectly…