System and/or method for acquisition of GNSS signals
First Claim
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1. A method comprising:
- detecting a first code phase in a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location; and
determining a code phase search range for detection of a second code phase in a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected code phase of said first received signal, an estimated azimuth angle to said first SV from said reference location and an estimated azimuth angle to said second SV from said reference location, wherein determining the code phase search range includesdetermining an estimated code phase of the signal received from the second SV based at least in part on the first code phase, anddetermining a code phase uncertainty based at least in part on the estimated azimuth angle to said first SV and the estimated azimuth angle to said second SV.
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Abstract
The subject matter disclosed herein relates to a system and method for acquiring signal received from space vehicles (SVs) in a satellite navigation system. In one example, although claimed subject matter is not so limited, information processed in acquiring a signal from a first SV may be used in acquiring a signal from a second SV.
23 Citations
28 Claims
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1. A method comprising:
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detecting a first code phase in a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location; and determining a code phase search range for detection of a second code phase in a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected code phase of said first received signal, an estimated azimuth angle to said first SV from said reference location and an estimated azimuth angle to said second SV from said reference location, wherein determining the code phase search range includes determining an estimated code phase of the signal received from the second SV based at least in part on the first code phase, and determining a code phase uncertainty based at least in part on the estimated azimuth angle to said first SV and the estimated azimuth angle to said second SV. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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detecting a. first code phase of a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location, said first SV being in a constellation of SVs in a first Global Navigation Satellite System (GNSS); and determining a code phase search range for detection of a second code phase of a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected first code phase, said second SV being in a constellation of SVs in a second GNSS different from said first GNSS, and wherein determining the code phase search range includes estimating a code phase of the second SV based at least in part on a sum of the detected first code phase and a difference between estimated ranges from the reference location to the first and second SVs. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. An article comprising:
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a storage medium, said storage medium comprising machine-readable instructions stored thereon which, if executed by a computing platform, are adapted to cause said computing platform to; determine a first code phase in a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location; and determine a code phase search range for detection of a second code phase in a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected code phase of said first received signal, an estimated azimuth angle to said first SV from said reference location and an estimated azimuth angle to said second SV from said reference location, wherein determining the code phase search range includes determining an estimated code phase of the signal received from the second SV based at least in part on the first code phase, and determining a code phase uncertainty based at least in part on the estimated azimuth angle to said first SV and the estimated azimuth angle to said second SV.
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16. An article comprising:
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a storage medium, said storage medium comprising machine-readable instructions stored thereon which, if executed by a computing platform, are adapted to cause said computing platform to; determine a first code phase of a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location, said first SV being in a constellation of SVs in a first Global Navigation Satellite System (GNSS); and determine a code phase search range for detection of a second code phase of a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said first code phase, said second SV being in a constellation of SVs in a second GNSS different from said first GNSS, wherein said instructions are adapted to cause said computing platform to determine the code phase search range by estimating a code phase of the second SV based at least in part on a sum of the detected first code phase and a difference between estimated ranges from the reference location to the first and second SVs.
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17. A subscriber unit comprising:
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a receiver to receive an acquisition assistance (AA) message comprising information indicative of an estimated azimuth angle to a first space vehicle (SV) from a reference location and an estimated azimuth angle to a second SV from said reference location, said subscriber unit being adapted to; detect a first code phase in a first periodically repeating pseudorandom encoded signal received from said first space vehicle (SV) at said reference location; and determine a code phase search range for detection of a second code phase in a second periodically repeating pseudorandom encoded signal received from said second SV at said reference location based, at least in part, on said detected code phase of said first received signal, said estimated azimuth angle to said first SV from said reference location and said estimated azimuth angle to said second SV from said reference location, wherein determining the code phase search range includes determining an estimated code phase of the signal received from the second SV based at least in part on the first code phase, and determining a code phase uncertainty based at least in part on the estimated azimuth angle to said first SV and the estimated azimuth angle to said second SV. - View Dependent Claims (18)
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19. A subscriber unit comprising:
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a receiver to receive an acquisition assistance (AA) message comprising information indicative of locations of space vehicles (SVs) in two or more Global Navigation Satellite Systems (GNSS'"'"'), said subscriber unit being adapted to; detect a first code phase of a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location, said first SV being in a constellation of SVs in a first one of said GNSS'"'"'; and determine a code phase search range for detection of a second code phase of a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected first code phase, said second SV being in a constellation of SVs in a second one of said GNSS'"'"' different from said first GNSS, wherein said subscriber unit is adapted to determine the code phase search range by estimating a code phase of the second SV based at least in part on a sum of the detected first code phase and a difference between estimated ranges from the reference location to the first and second SVs. - View Dependent Claims (20)
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21. A system comprising:
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a position determination entity (PDE); and a subscriber unit, the subscriber unit being adapted to; receive an acquisition assistance (AA) message from a said PDE over a wireless communication link, said AA message comprising information indicative of an estimated azimuth angle to a first space vehicle (SV) from a reference location and an estimated azimuth angle to a second SV from said reference location; detect a first code phase in a first periodically repeating pseudorandom encoded signal received from said first space vehicle (SV) at said reference location; and determine a code phase search range for detection of a second code phase in a second periodically repeating pseudorandom encoded signal received from said second SV at said reference location based, at least in part, on said detected code phase of said first received signal, said estimated azimuth angle to said first SV from said reference location and said estimated azimuth angle to said second SV from said reference location, wherein determining the code phase search range includes determining an estimated code phase of the signal received from the second SV based at least in part on the first code phase, and determining a code phase uncertainty based at least in part on the estimated azimuth angle to said first SV and the estimated azimuth angle to said second SV.
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22. A system comprising:
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a position determination entity (PDE); and a subscriber unit, the subscriber unit being adapted to; receive an acquisition assistance (AA) message from said PDE over a wireless communication link, said AA message comprising information indicative of locations space vehicles (SVs) in two or more Global Navigation Satellite Systems (GNSS'"'"'); detect a first code phase of a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location, said first SV being in a constellation of SVs in a first one of said GNSS'"'"'; and determine a code phase search range for detection of a second code phase of a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected first code phase, said second SV being in a constellation of SVs in a second one of said GNSS'"'"' different from said first GNSS, wherein said subscriber unit is adapted to determine the code phase search range by estimating a code phase of the second SV based at least in part on a sum of the detected first code phase and a difference between estimated ranges from the reference location to the first and second SVs.
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23. An apparatus comprising:
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means for detecting a first code phase in a first periodically repeating pseudorandom encoded signal received from a first space vehicle (SV) at a reference location; and means for determining a code phase search range for detection of a second code phase in a second periodically repeating pseudorandom encoded signal received from a second SV at said reference location based, at least in part, on said detected code phase of said first received signal, an estimated azimuth angle to said first SV from said reference location and an estimated azimuth angle to said second SV from said reference location, wherein the means for determining the code phase search range includes means for determining an estimated code phase of the signal received from the second SV based at least in part on the first code phase, and means for determining a code phase uncertainty based at least in part on the estimated azimuth angle to said first SV and the estimated azimuth angle to said second SV. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification