Networked differential GPS system

摘要: An embodiment of the present invention relates to a worldwide network differential GPS reference stations (NDGPS) that continually track entire satellite constellation and provide interpolations station corrections tailored for particular user locations between Each takes real-time ionospheric measurements with codeless cross-correlating dual-frequency carrier receivers computes orbit ephemerides independently. absolute pseudorange correction (PRC) is defined each as function user's location. A map constructed, "iso-PRC" contours. The measures PRCs at few points, so-called constructs an iso-PRC satellite. Corrections are interpolated site on subscription basis. data bandwidths kept minimum by transmitting information cannot be obtained directly updating classes according how quickly class goes stale given realities system. Sub-decimeter-level kinematic accuracy over area accomplished establishing mini-fiducial network.