System and/or method for acquisition of GNSS signals
First Claim
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1. A computer-implemented method in a component of a wireless receiver comprising:
- receiving an acquisition assistance (AA) message comprising information indicative of a reference location and information defining a first Doppler search window;
detecting a first Doppler frequency in a first signal received from a first space vehicle (SV) at the reference location; and
determining a search range defining a range of frequencies to be searched for detecting a second Doppler frequency in a second signal received at the reference location from a second SV based, at least in part, on the detected first Doppler frequency, the information defining the first Doppler search window, and a second Doppler search window, wherein determining the search range includes determining the second Doppler search window based at least in part on an estimated azimuth angle to the first SV relative to the reference location and an estimated azimuth angle to the second SV relative to the reference location, and reducing the size of the search range by selecting the smaller of the first Doppler search window and the second Doppler search window to use as the search range.
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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.
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Citations
17 Claims
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1. A computer-implemented method in a component of a wireless receiver comprising:
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receiving an acquisition assistance (AA) message comprising information indicative of a reference location and information defining a first Doppler search window; detecting a first Doppler frequency in a first signal received from a first space vehicle (SV) at the reference location; and determining a search range defining a range of frequencies to be searched for detecting a second Doppler frequency in a second signal received at the reference location from a second SV based, at least in part, on the detected first Doppler frequency, the information defining the first Doppler search window, and a second Doppler search window, wherein determining the search range includes determining the second Doppler search window based at least in part on an estimated azimuth angle to the first SV relative to the reference location and an estimated azimuth angle to the second SV relative to the reference location, and reducing the size of the search range by selecting the smaller of the first Doppler search window and the second Doppler search window to use as the search range. - View Dependent Claims (2, 3, 16, 17)
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4. An article comprising:
a tangible computer-readable storage medium comprising machine-readable instructions stored thereon that, when executed by a computing platform, are adapted to cause the computing platform to; receive an acquisition assistance (AA) message comprising information indicative of a reference location and information defining a first Doppler search window; determine a first Doppler frequency in a first signal received from a first space vehicle (SV) at the reference location; and determine a search range defining a range of frequencies to be searched for detecting a second Doppler frequency in a second signal received at the reference location from a second SV based, at least in part, on the detected first Doppler frequency, the information defining the first Doppler search window, and a second Doppler search window, wherein the instructions to cause the computing platform to determine the search range include instructions to cause the computing platform to determine the second Doppler search window based at least in part on an estimated azimuth angle to the first SV relative to the reference location and an estimated azimuth angle to the second SV relative to the reference location, and instructions to cause the computing platform to reduce the size of the search range by selecting the smaller of the first Doppler search window and the second Doppler search window to use as the search range. - View Dependent Claims (5, 6)
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7. A subscriber unit comprising:
a receiver configured to receive an acquisition assistance (AA) message comprising information indicative of a reference location and information defining a first Doppler search window, the subscriber unit being adapted to; detect a first Doppler frequency in a first signal received from a first space vehicle (SV) at the reference location; and determine a search range defining a range of frequencies to be searched for detecting a second Doppler frequency in a second signal received at the reference location from a second SV based, at least in part, on the detected first Doppler frequency, the information defining the first Doppler search window, and a second Doppler search window, wherein the receiver is further configured to determine the second Doppler search window based at least in part on an estimated azimuth angle to the first SV relative to the reference location and an estimated azimuth angle to the second SV relative to the reference location, and select the smaller of the first Doppler search window and the second Doppler search window to use as the search range. - View Dependent Claims (8, 9, 10, 11)
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12. A system comprising:
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means for receiving an acquisition assistance (AA) message comprising information indicative of a reference location and information defining a first Doppler search window; means for detecting a first Doppler frequency in a first signal received from a first space vehicle (SV) at the reference location; and means for determining a search range defining a range of frequencies to be searched for detecting a second Doppler frequency in a second signal received at the reference location from a second SV based, at least in part, on the detected first Doppler frequency, the information defining the first Doppler search window, and a second Doppler search window, wherein the means for determining the search range includes means for determining the second Doppler search window based at least in part on an estimated azimuth angle to the first SV relative to the reference location and an estimated azimuth angle to the second SV relative to the reference location, and means for reducing the size of the search range by selecting the smaller of the first Doppler search window and the second Doppler search window to use as the search range. - View Dependent Claims (13, 14)
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15. A system comprising:
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a position determination entity (PDE); and a subscriber unit adapted to; receive an acquisition assistance (AA) message from the PDE over a wireless communication link, the AA message comprising information indicative of a reference location and information defining a first Doppler search window; detect a first Doppler frequency in a first signal received from a first space vehicle (SV) at the reference location; and determine a search range defining a range of frequencies to be searched for detecting a second Doppler frequency in a second signal received at the reference location from a second SV based, at least in part, on the detected first Doppler frequency, the information defining the first Doppler search window, and a second Doppler search window, wherein the subscriber unit is configured to determine the second Doppler search window based at least in part on an estimated azimuth angle to the first SV relative to the reference location and an estimated azimuth angle to the second SV relative to the reference location, and reduce the size of the search range by selecting the smaller of the first Doppler search window and the second Doppler search window to use as the search range.
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Specification