Method and apparatus for maintaining integrity of long-term orbits in a remote receiver
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a remote receiver and long-term orbit technology, applied in the field of position location systems, can solve the problems of affecting the accuracy affecting the integrity of satellite navigation data, so as to achieve the effect of maintaining the integrity of long-term orbit information
Inactive Publication Date: 2007-08-30
AVAGO TECH WIRELESS IP SINGAPORE PTE
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[0020] A method and apparatus for maintaining integrity of long-term-orbit information used by a GNSS or other positioning receiver is described. The method may include obtaining a predicted pseudorange from a first set of long-term-orbit information possessed by a positioning receiver; obtaining, at the positioning receiver from at least one satellite, a measured pseudorange; determining validity of the predicted pse
Problems solved by technology
Errors in absolute may result in range errors of up to 0.8 m for each millisecond of timing error.
These range errors produce a similarly sized error in the GPS receiver position.
Hence, absolute time accuracy of 10 ms is sufficient for position accuracy of approximately 10 m. Errors in the absolute timing of much more than 10 ms resul
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[0034]FIG. 1 is a block diagram depicting an example of a Global Navigation Satellite System (“GNSS”) 100. The GNSS 100 includes a plurality or constellation of satellites for transmitting satellite signals, as represented satellites 105, a GNSS receiver 104 for receiving the satellite signals, and a server 102. The satellites 105, the GNSS receiver 104, the server 102, the GNSS 100 as a whole, and functions, procedures, components and other details provided herein may be tailored for any GNSS, including, for example, the Global Positioning System (“GPS”), GALILEO, GLONASS, SBAS (Space Based Augmentation System), QZSS (Quazi-Zenith Satellite System), LAAS (Local Area Augmentation System) or some combination thereof.
[0035] The GNSS receiver 104 may be in communication with the server 102 via a communication link. This communication link may be formed, for example, by communicatively coupling one or more nodes of a network, such as a wireless communication system 106 (e.g., cellular ...
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Abstract
A method and apparatus for maintaining integrity of long-term-orbit information used by a Global-Navigation-Satellite-System or other positioning receiver is described. The method comprises obtaining a predicted pseudorange from a first set of long-term-orbit information possessed by a positioning receiver; obtaining, at the positioning receiver from at least one satellite, a measured pseudorange; determining validity of the predicted pseudorange as a function of the predicted pseudorange and the measured pseudorange; and excluding from the long-term-orbit information at least a portion thereof when the validity of the predicted pseudorange is deemed invalid. Optionally, the method may comprise updating or otherwise supplementing the long-term-orbit information with other orbit information if the validity of the predicted pseudorange is deemed invalid.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part application of co-pending U.S. patent application Ser. No. 11 / 333,787, filed Jan. 17, 2006 (Attorney Docket GLBL 022P2), which is a continuation-in-part application of co-pending U.S. patent application Ser. No. 09 / 993,335, filed Nov. 6, 2001, which is a continuation-in-part of U.S. patent application Ser. No. 09 / 884,874, filed Jun. 19, 2001, now U.S. Pat. No. 6,560,534, which is a continuation-in-part of U.S. patent application Ser. No. 09 / 875,809, filed Jun. 6, 2001, now U.S. Pat. No. 6,542,820. [0002] This application is also a continuation-in-part application of co-pending U.S. patent application Ser. No. 11 / 289,959, filed Nov. 30, 2005, which is a continuation of U.S. patent application Ser. No. 10 / 712,807, filed 13 Nov. 2003, now U.S. Pat. No. 6,992,617. [0003] This application contains subject matter that is related to U.S. patent application Ser. No. 09 / 715,860, filed Nov. 17, 2000, now...
Claims
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