Method and apparatus for signal processing in a satellite positioning system using navigation message common information
First Claim
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1. A method comprising:
- at a mobile device, receiving a signal from a first satellite, the signal from the first satellite comprising a pseudorandom noise (PN) code portion and a navigation message portion both associated with the first satellite;
processing a first segment of the navigation message portion and a second segment of the navigation message portion, wherein the first segment and the second segment include common information, wherein processing the first segment of the navigation message portion and the second segment of the navigation message portion comprises checking consistency of common information in the first segment of the navigation message portion and the second segment of the navigation message portion and generating consistent common information therefrom;
subsequently accessing the consistent common information to determine position information of the mobile device.
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Abstract
A method and apparatus for processing satellite positioning system (SPS) signals which are weak in level. In one embodiment, a SPS receiver receives at least two signal samples representing, at least in part, common information, wherein the two signal samples are associated with one or more satellite messages. By combining the two signal samples, navigation information (e.g., time, position, velocity, etc.) may be determined based on the combination of the two signal samples. According to another embodiment, the two signal samples are differentially demodulated and summed together to form the combination.
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Citations
25 Claims
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1. A method comprising:
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at a mobile device, receiving a signal from a first satellite, the signal from the first satellite comprising a pseudorandom noise (PN) code portion and a navigation message portion both associated with the first satellite; processing a first segment of the navigation message portion and a second segment of the navigation message portion, wherein the first segment and the second segment include common information, wherein processing the first segment of the navigation message portion and the second segment of the navigation message portion comprises checking consistency of common information in the first segment of the navigation message portion and the second segment of the navigation message portion and generating consistent common information therefrom; subsequently accessing the consistent common information to determine position information of the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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at a mobile device, receiving a signal from a first satellite, the signal from the first satellite comprising a pseudorandom noise (PN) code portion and a navigation message portion both associated with the first satellite; at the mobile device, receiving a signal from a second satellite, the signal from the second satellite comprising a pseudorandom noise (PN) code portion and a navigation message portion both associated with the second satellite processing a first segment of the navigation message portion associated with the first satellite and a second segment of the navigation message portion associated with the second satellite, wherein the first segment and the second segment include common information, wherein processing the first segment and the second segment comprises checking consistency of common information in the first segment and the second segment and generating consistent common information therefrom; subsequently accessing the consistent common information to determine position information of the mobile device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A mobile device comprising:
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an SPS antenna to receive signals from one or more satellites, the signals from the one or more satellites comprising a pseudorandom noise (PN) code portion and a navigation message portion both associated with a particular satellite; a processor to process a first segment of a navigation message portion associated with one of the one or more satellites and a second segment of the navigation message portion associated with one of the one or more satellites, wherein the first segment and the second segment include common information, wherein processing the first segment and the second segment comprises checking consistency of common information in the first segment and the second segment and generating consistent common information therefrom; memory to store the consistent common information, wherein the processor is further configured to access the consistent common information to determine position information of the mobile device. - View Dependent Claims (16, 17, 18)
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19. A mobile device comprising:
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means for receiving signals from one or more satellites, the signals from the one or more satellites each comprising a pseudorandom noise (PN) code portion and a navigation message portion both associated with a particular satellite; means for processing a first segment of a navigation message portion associated with one of the one or more satellites and a second segment of the navigation message portion associated with one of the one or more satellites, wherein the first segment and the second segment include common information, wherein the means for processing the first segment and the second segment comprises means for checking consistency of common information in the first segment and the second segment and means for generating consistent common information therefrom; means for storing the consistent common information; means for accessing the consistent common information; and means for determining position information of the mobile device. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification