GNSS positioning and interference

Global Navigation Satellite Systems — GPS, GLONASS, Galileo, and BeiDou among them — determine position by measuring the travel time of radio signals from constellations of orbiting satellites to receivers on the ground, in the air, or in space. Getting that position right at the centimeter or even millimeter level requires carefully accounting for signal delays introduced by the troposphere and ionosphere, errors in the satellite orbit and clock models, and the geometry of the reference frames that tie measurements together across the globe. Techniques like Precise Point Positioning and ambiguity resolution push accuracy toward its physical limits without needing a nearby ground reference station, opening the door to high-precision navigation in remote or airborne environments. Active research centers on how to combine signals from multiple constellations simultaneously, how to model atmospheric variability in real time, and how antenna hardware imperfections propagate into geodetic and navigation solutions.

Works

73,839

Total citations

542,897

Keywords

Global Navigation Satellite SystemsGNSSPrecise Point PositioningReference FrameAtmospheric EffectsOrbit Determination