CORRECTION OF TROPOSPHERE INDUCED ERRORS IN GLOBAL POSITIONING SYSTEMS

摘要

Using a regional or a global three-dimensional map and the meteorological information of the grid points to calculate the convective layer delayed by a light track with a refractive field derived from atmospheric measurements, such as containing the pressure, temperature and moisture, by the server (200) the method for obtaining data for use by GNSS receiver or a satellite positioning systems, including the step of deriving the data from the remote receiver is shown. When used to improve the user location determined by the receiver, including the overhead ratio meteorological, climate-based model that provides a delay (130) and means (130') to map them concrete ramps, the server also such non- It contains a copy of the meteorological model 230, and provides the light beam that is tracking the delay value as the delay overhead. Set of ceiling delay value for that grid point is with the server (260), said non-meteorological delay values ​​by requiring a more accurate correction to be compared in the deployed strain (preferably with a small format). The correction set is transmitted to the user receiver at a lower data rate through is reduced by the image compression unit 270, the in the GNSS satellite (110 _1, etc.). The receiver simply apply the correction to the ceiling delay induced by its own model. User location is known, the server can derive the correct delay value convection zone for the receiver position for the transmission directly.