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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

Inactive Publication Date: 2006-12-14
ROBBINS JAMES E
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Problems solved by technology

However, differential GPS (DGPS) corrections for determinations of location and / or time are usually limited to a region no more than a few hundred kilometers (kin) in diameter.
For regions of larger diameter, errors due to differences in ionospheric delay, tropospheric delay, satellite position errors and similar phenomena accumulate and can increase the total location error of a DGPS calculation to tens of meters or larger.

Method used

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  • Differential GPS corrections using virtual stations
  • Differential GPS corrections using virtual stations
  • Differential GPS corrections using virtual stations

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Embodiment Construction

[0049]FIG. 1 illustrates use of the invention to cover a large region S, which may extend over the entire Earth or may have a smaller diameter. Each of three or more GPS reference stations 11A, 11B, 11C, with GPS signal antennas 13A, 13B, 13C, and receiver / processors 14A, 14B, 14C receives GPS signals, including pseudorange information, from several common-view GPS satellites 15A, 15B, 15C, 15D. A common-view” satellite is visible from the sites of at least three reference stations at the same observation times. The location coordinates of each of the reference stations 11A, etc. is known with high accuracy, either by use of a surveyor by some other means. As each reference station 11A, 11B, 11C, receives the GPS signals from each of the GPS satellites 15A, 15B, 15C, the GPS-determined pseudorange for the GPS antenna for that station and that satellite is compared with a calculated pseudorange for that station and that satellite, and GPS pseudorange corrections PRC(t;t0;m;n) are gen...

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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.

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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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01C21/00G01S19/25G01S5/14G01S19/07G01S19/41G01S19/43
CPCG01C15/00G01C21/28G01S19/43G01S19/258G01S19/41G01S19/07G01S19/071
Inventor ROBBINS, JAMES E.
Owner ROBBINS JAMES E
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