GNSS Signal Processing with Regional Augmentation Message
First Claim
1. A method of preparing a GNSS correction message, comprising:
- a. receiving correction data derived from observations at multiple stations, located within a region, of GNSS signals of multiple satellites over multiple epochs,b. separating the regional correction data into network elements relating to substantially all of the stations and cluster elements relating to subsets of the stations, andc. constructing a correction message comprising at least one network message containing network elements and at least one cluster message containing cluster elements.
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Accused Products
Abstract
Methods and apparatus for processing of GNSS data derived from multi-frequency code and carrier observations are presented which make available correction data for use by a rover located within the region, the correction data comprising: the ionospheric delay over the region, the tropospheric delay over the region, the phase-leveled geometric correction per satellite, and the at least one code bias per satellite. In some embodiments the correction data includes an ionospheric phase bias per satellite. Methods and apparatus for determining a precise position of a rover located within a region are presented in which a GNSS receiver is operated to obtain multi-frequency code and carrier observations and correction data, to create rover corrections from the correction data, and to determine a precise rover position using the rover observations and the rover corrections. The correction data comprises at least one code bias per satellite, a fixed-nature MW bias per satellite and/or values from which a fixed-nature MW bias per satellite is derivable, and an ionospheric delay per satellite for each of multiple regional network stations and/or non-ionospheric corrections. Methods and apparatus for encoding and decoding the correction messages containing correction data are also presented, in which network messages include network elements related to substantially all stations of the network and cluster messages include cluster elements related to subsets of the network.
42 Citations
44 Claims
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1. A method of preparing a GNSS correction message, comprising:
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a. receiving correction data derived from observations at multiple stations, located within a region, of GNSS signals of multiple satellites over multiple epochs, b. separating the regional correction data into network elements relating to substantially all of the stations and cluster elements relating to subsets of the stations, and c. constructing a correction message comprising at least one network message containing network elements and at least one cluster message containing cluster elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. (canceled)
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13. Apparatus comprising a processor with instructions enabling the processor to prepare a GNSS correction message for correction derived from observations at multiple stations, located within a region, of GNSS signals of multiple satellites over multiple epochs by
separating the regional correction data into network elements relating to substantially all of the stations and cluster elements relating to subsets of the stations, and constructing a correction message comprising at least one network message containing network elements and at least one cluster message containing cluster elements.
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23. A method of preparing regional GNSS corrections from a correction message having at least one network message containing network elements relating to substantially all stations of a network of stations located within a region, and having at least one cluster message with each cluster message containing cluster elements relating to a respective subset of the stations, comprising:
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extracting network elements from the at least one network message, extracting cluster elements from the at least one cluster message, and preparing from the network elements and the cluster elements correction data suitable for use with rover observations to determine a precise position of a rover within the region. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. Apparatus comprising a processor with instructions enabling the processor to prepare regional GNSS corrections from a correction message having at least one network message containing network elements relating to substantially all stations of a network of stations located within a region, and having at least one cluster message with each cluster message containing cluster elements relating to a respective subset of the stations, by
extracting network elements from the at least one network message, extracting cluster elements from the at least one cluster message, and preparing from the network elements and the cluster elements correction data suitable for use with rover observations to determine a precise position of a rover within the region.
Specification