Differential GPS corrections using virtual stations
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Abstract
Method and apparatus for providing GPS pseudorange correction and carrier phase correction information for navigation or surveying activities over a selected geographic region S of arbitrary size. In a navigation mode, a virtual reference station (VRS), positioned near a selected location L, receives differential GPS (DGPS) correction signals, translates these signals into a selected format, and broadcasts this DGPS information in this format for use by a local user. In a survey mode, the VRS receives corrected GPS information, translates this information into a selected format and broadcasts this translated and corrected GPS information and the VRS location, for use by a mobile station in forming a baseline vector from the GPS mobile station to the VRS location.
82 Citations
36 Claims
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1. (canceled)
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2. A method of processing SATPS signals, comprising:
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a. Obtaining signal information derived from SATPS signals received from at least three satellites at three or more reference stations, b. Obtaining ephemeris information for each of the satellites, c. For each satellite, estimating from the signal information and from the ephemeris information a satellite location error vector, d. For each satellite, determining a component of range error due to satellite location error at a selected location, and e. Making available the component of range error for each satellite to compensate for satellite location error when computing a position estimate from SATPS signals received at a mobile station location. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Apparatus for processing SATPS signals, comprising a VRS computer operative to:
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receive signal information derived from SATPS signals received from at least three satellites at three or more reference stations;
receive ephemeris information for each of the satellites;
for each satellite, estimate from the signal information and from the ephemeris information a satellite location error vector;
for each satellite, determine a component of range error due to satellite location error at a selected location; and
make available the component of range error for each satellite to compensate for satellite location error when computing location of a mobile station from SATPS signals received at the mobile station. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification