Decoupled clock model with ambiguity datum fixing
First Claim
1. A method of determining parameters of interest associated with one or more GPS receivers, comprising the steps of:
- receiving GPS signals at one or more GPS receivers from a plurality of GPS satellite transmitters;
obtaining from the GPS signals received by the one or more GPS receivers undifferentiated GPS carrier phase and pseudorange measurements, made at two frequencies;
defining separate clock error parameters for the carrier phase and pseudorange measurements;
arbitrarily biasing carrier phase estimates of clock errors with respect to pseudorange estimates of clock errors;
constraining the ambiguity parameters to be integer-valued; and
determining parameters of interest associated with the one or more GPS receivers based on the constraint of the integer-valued ambiguity parameters.
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Accused Products
Abstract
The present invention relates to a method of processing Global Positioning System (GPS) carrier phase and pseudorange information. Dual-frequency carrier phase and pseudorange measurements from GPS receivers are processed by specifying separate oscillator parameters for the carrier phase and pseudorange measurements. Carrier phase estimates of errors of the oscillator are arbitrarily biased with respect to the pseudorange estimates, and ambiguity parameters are constrained to be integer-valued. Isolating the ambiguities as integer valued parameters provides extra information that can be exploited to maximize the use of GPS and other Global Navigation Satellite Systems.
50 Citations
29 Claims
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1. A method of determining parameters of interest associated with one or more GPS receivers, comprising the steps of:
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receiving GPS signals at one or more GPS receivers from a plurality of GPS satellite transmitters; obtaining from the GPS signals received by the one or more GPS receivers undifferentiated GPS carrier phase and pseudorange measurements, made at two frequencies; defining separate clock error parameters for the carrier phase and pseudorange measurements; arbitrarily biasing carrier phase estimates of clock errors with respect to pseudorange estimates of clock errors; constraining the ambiguity parameters to be integer-valued; and determining parameters of interest associated with the one or more GPS receivers based on the constraint of the integer-valued ambiguity parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 25, 26, 27)
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23. A method of determining GPS information comprising the steps of:
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receiving GPS signals at one or more GPS receivers from a plurality of GPS satellite transmitters; obtaining from the GPS signals undifferenced GPS carrier phase and pseudorange measurements, made at two frequencies, at the one or more GPS receivers; defining separate clock error parameters for the carrier phase and pseudorange measurements; arbitrarily biasing carrier phase estimates of clock errors with respect to pseudorange estimates of clock errors; constraining the ambiguity parameters to be integer-valued; and determining the estimated GPS information of the one or more GPS receivers based on the constraint of the integer-valued ambiguity parameters. - View Dependent Claims (28)
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24. A system for determining GPS information comprising:
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one or more GPS receivers for receiving GPS signals from a plurality of GPS satellite transmitters; means for obtaining from the GPS signals undifferenced GPS carrier phase and pseudorange measurements, made at two frequencies, at the one or more GPS receivers; means for defining separate clock error parameters for the carrier phase and pseudorange measurements; means for arbitrarily biasing carrier phase estimates of clock errors with respect to pseudorange estimates of clock errors; means for constraining the ambiguity parameters to be integer-valued; and means for determining the estimated GPS information of the one or more GPS receivers based on the constraint of the integer-valued ambiguities. - View Dependent Claims (29)
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Specification