Differential GPS corrections using virtual stations

a virtual station and gps technology, applied in the field of networked global positioning system stations, can solve the problems of increasing the total location error of a dgps calculation to tens of meters or larger, and the differential gps corrections for location and/or time determination are usually limited, so as to reduce the size
US20060282216A1Inactive Publication Date: 2006-12-14ROBBINS JAMES E
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
ROBBINS JAMES E
Publication Date
2006-12-14
Estimated Expiration
Not applicable · inactive patent

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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.
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Description

FIELD OF THE INVENTION

[0001] This patent application is a continuation of application, U.S. Ser. No. 09 / 019,495, filed on 5 Feb. 1998, which is a continuation of application, U.S. Ser. No. 08 / 414,444, filed on 31 Mar. 1995, which is a continuation in part of application, U.S. Ser. No. 08 / 177,012, filed on 3 Jan. 1994 and assigned to the Assignee of this application. This-invention relates to a network of Global Positioning System stations for providing code phase or carrier phase differential corrections to enhance the accuracy of location information over a wide area.BACKGROUND OF THE INVENTION

[0002] Differential corrections for location information provided by a Global Positioning System (GPS) offer the possibility of reducing the inaccuracies in location and observation time provided by such system from tens of meters to one meter or less and tens of nanoseconds or less, respectively. However, differential GPS (DGPS) corrections for determinations of location and / or time are us...

Claims

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