Apparatus and method for processing multiple frequencies in satellite navigation systems
First Claim
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1. A system for optimum correlation processing of at least three signals M1, M2, and M3 emanating from the same satellite belonging to the satellite positioning system (SPS), said system comprising:
- a RECEIVING CIRCUIT for receiving and preparing for processing each said M1, M2, and M3 signal; and
a DIGITAL SIGNAL PROCESSING CIRCUIT for processing each said M1, M2, and M3 signal in order to perform the code and carrier measurements to solve for user'"'"'s position, velocity, and time coordinate;
wherein the availability of at least three M1, M2, and M3 signals increases the accuracy in finding the user'"'"'s position, velocity, and time coordinate.
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Abstract
The multiple frequency satellite correlation receiver is disclosed. The three frequency receiver allows one to significantly enhance the widelane carrier phase measurements in order to improve the differential and survey navigation applications.
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Citations
13 Claims
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1. A system for optimum correlation processing of at least three signals M1, M2, and M3 emanating from the same satellite belonging to the satellite positioning system (SPS), said system comprising:
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a RECEIVING CIRCUIT for receiving and preparing for processing each said M1, M2, and M3 signal; and a DIGITAL SIGNAL PROCESSING CIRCUIT for processing each said M1, M2, and M3 signal in order to perform the code and carrier measurements to solve for user'"'"'s position, velocity, and time coordinate; wherein the availability of at least three M1, M2, and M3 signals increases the accuracy in finding the user'"'"'s position, velocity, and time coordinate.
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2. A system for optimum correlation processing of at least three L1, L2, and L3 signals received from a SPS satellite by a SPS RECEIVER, said system comprising:
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a RECEIVING CIRCUIT for receiving a known C/A code and a known P(Y) code modulated on L1 carrier frequency signal, for receiving a known P(Y) code modulated on L2 carrier frequency signal, and for receiving a known C/A code modulated on L3 carrier frequency from at least one satellite;
wherein said received L1, L2, and L3 signals contain propagation noise; andat least one DIGITAL CHANNEL PROCESSING CIRCUIT for; (1) locally generating replica of said C/A code modulated on L1 carrier frequency signal and on L3 carrier frequency; (2) locally generating replica of said P(Y) code modulated on L1 carrier frequency signal and on L2 carrier frequency signal; (3) correlating a locally generated replica of C/A or P(Y) code with the received L1 code for obtaining an estimate of L1 group delay (L1 pseudo-range) and L1 carrier phase; (4) correlating a locally generated replica of P(Y) code with the received L2 code for obtaining an estimate of L2 group delay (L2 pseudo-range) and L2 carrier phase; and (5) correlating a locally generated replica of C/A code with the received L3 code for obtaining an estimate of L3 group delay (L3 pseudo-range) and L3 carrier phase. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for optimum correlation processing of at least three signals M1, M2, and M3 emanating from the same satellite belonging to the satellite positioning system (SPS), said method comprising the steps of:
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receiving and preparing for processing each said M1, M2, and M3 signal by a RECEIVING CIRCUIT; and processing each said M1, M2, and M3 signal in order to perform the code and carrier measurements to solve for user'"'"'s position, velocity, and time coordinate by a DIGITAL SIGNAL PROCESSING CIRCUIT; wherein the availability of at least three M1, M2, and M3 signals increases the accuracy in finding the user'"'"'s position, velocity, and time coordinate.
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13. A method for optimum correlation processing of at least three L1, L2, and L3 signals received from a SPS satellite by a SPS RECEIVER, said method comprising the steps of:
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receiving a known C/A code and a known P(Y) code modulated on L1 carrier frequency signal from at least one satellite by a RECEIVING CIRCUIT; receiving a known P(Y) code modulated on L2 carrier frequency signal from at least one satellite by a RECEIVING CIRCUIT; receiving a known C/A code modulated on L3 carrier frequency from at least one satellite by a RECEIVING CIRCUIT; locally generating replica of said C/A code modulated on L1 carrier frequency by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; locally generating replica of said C/A code modulated on L3 carrier frequency by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; locally generating replica of said P(Y) code modulated on L1 carrier frequency by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; locally generating replica of said P(Y) code modulated on L2 carrier frequency by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; correlating the locally generated replica of C/A code with the received L1 code for obtaining an estimate of L1 group delay (L1 pseudo-range) and L1 carrier phase by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; correlating the locally generated replica of P(Y) code with the received L1 code for obtaining an estimate of L1 group delay (L1 pseudo-range) and L1 carrier phase by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; correlating the locally generated replica of P(Y) code with the received L2 code for obtaining an estimate of L2 group delay (L2 pseudo-range) and L2 carrier phase by at least one DIGITAL CHANNEL PROCESSING CIRCUIT; and correlating the locally generated replica of C/A code with the received L3 code for obtaining an estimate of L3 group delay (L3 pseudo-range) and L3 carrier phase by at least one DIGITAL CHANNEL PROCESSING CIRCUIT.
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Specification