• Geodetic data fusion and gravity-field modeling unify satellite-tracking with terrestrial data to derive Earth's gravity field, station coordinates, and reference frames, enabling precise, consistent global networks through combined observations, gravimetric data, and interferometry. [2], [6], [10], [9], [3], [18]

• Time/frequency resources and satellite-based dissemination underpin navigation concepts, enabling passive positioning via Doppler techniques and data fusion in operational and experimental systems; demonstrates time transfer and navigation updates as core infrastructure. [4], [11], [20], [16]

• Laser ranging to satellites provides high-precision monitoring of polar motion and secular variations in Earth's rotation, complemented by dynamic ranging analyses of multiple stations; illustrates polar-motion determination from laser data and related geodetic inference. [1], [18]

• Atmospheric propagation corrections are essential for precise satellite ranging/navigation, with methods to correct for arbitrary tropospheric profiles and horizontal refractivity gradients, and assessments of atmospheric-path effects on range accuracy. [8], [15], [19]