Cross-link inter-satellite links in navigation constellations enable autonomous orbit determination without ground stations.
- True - used in GPS III/BeiDou
- False - requires constant ground contact
- True - only for LEO satellites
- False - technologically unfeasible
Answer: True - used in GPS III/BeiDou
Ka-band cross-links allow satellites to range each other, improving ephemeris accuracy and reducing ground segment dependency; implemented in modern GNSS.