Method and apparatus for signal processing in a satellite positioning system
First Claim
Patent Images
1. A method for satellite positioning system (SPS) signal processing, said method comprising:
- receiving at an SPS receiver one or more SPS signals;
removing pseudorandom noise from said one or more SPS signals to provide a first portion of a narrowband signal and a second portion of a narrowband signal;
combining said first portion with common information in said second portion to improve the sensitivity of the SPS receiver;
wherein said common information comprises data that is either repeated in time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals.
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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
84 Claims
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1. A method for satellite positioning system (SPS) signal processing, said method comprising:
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receiving at an SPS receiver one or more SPS signals; removing pseudorandom noise from said one or more SPS signals to provide a first portion of a narrowband signal and a second portion of a narrowband signal; combining said first portion with common information in said second portion to improve the sensitivity of the SPS receiver; wherein said common information comprises data that is either repeated in time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for processing a signal associated with a satellite positioning system, said method comprising:
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receiving at an SPS receiver a first SPS signal containing a satellite message associated with a satellite vehicle; receiving at said SPS receiver a second SPS signal containing said satellite message associated with said satellite vehicle; removing pseudorandom noise from said first and second SPS signals to provide a first set of signal samples of a narrowband signal and a second set of signal samples of a narrowband signal; combining common information in said first and second sets of signal samples to improve the sensitivity of the SPS receiver; wherein said common information comprises data that is either repeated in time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 41, 42)
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29. A method for satellite positioning system signal processing, said method comprising:
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receiving at an SPS receiver a first SPS signal containing a first satellite message, said first satellite message associated with a first satellite vehicle; receiving at said SPS receiver a second SPS signal containing a second satellite message, said second satellite message associated with a second satellite vehicle; removing pseudorandom noise from said first and second SPS signals to provide a first set of signal samples of a narrowband signal and a second set of signal samples of a narrowband signal; combining common information in said first and second sets of signal samples to improve the sensitivity of the SPS receiver; wherein said common information comprises data that is either repeated time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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43. An apparatus to provide satellite positioning system (SPS) signal processing, said apparatus comprising:
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a despreader that removes pseudorandom noise from one or more SPS signals to provide a first portion of a narrowband signal and a second portion of a narrowband signal; a processor, coupled to said despreader, to combine common information in said first portion with said second portion to improve the sensitivity of the SPS receiver said common information comprising data that is either repeated in time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. An apparatus to provide satellite positioning system (SPS) signal processing, said apparatus comprising:
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means for removing pseudorandom noise from one or more SPS signals to provide a first portion of a narrowband signal and a second portion of a narrowband signal; and means for combining common information in said first portion with said second portion to improve the sensitivity of the SPS receiver; wherein said common information comprises data that is either repeated in time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals. - View Dependent Claims (62, 63, 64, 65, 66, 67)
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68. An apparatus to provide satellite positioning system (SPS) signal processing, said apparatus comprising:
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a correlator, said correlator receiving one or more SPS signals; and a navigation computer coupled to the correlator, said navigation computer removing pseudorandom noise from said one or more SPS signals to provide a first portion of a narrowband signal and a second portion of a narrowband signal, said navigation computer combining common information in said first portion with said second portion to improve the sensitivity of the SPS receiver; wherein said common information comprises data that is either repeated in time within the same received SPS signal or that is concurrently contained in more than one of the received SPS signals. - View Dependent Claims (69, 70, 71, 72, 73, 74)
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75. An apparatus to provide satellite positioning system (SPS) signal processing, said apparatus comprising:
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means for receiving at an SPS receiver one or more SPS signals; means for removing pseudorandom noise from said one or more SPS signals to provide a first portion of a narrowband signal and a second portion of a narrowband signal; means for combining said first portion with said second portion to improve the sensitivity of the SPS receiver; wherein said first portion and said second portion contain common information in said one or more SPS signals. - View Dependent Claims (76, 77, 78, 79, 80, 81, 82, 83, 84)
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Specification