Method and apparatus for location determination in a wireless assisted hybrid positioning system
First Claim
1. A method to determine a position of a mobile device in a positioning system, the method comprising:
- obtaining a first estimated position of the mobile device;
determining an estimated clock bias from a strength indicator of a signal transmitted from a navigational transmitter to the mobile device;
computing a correction vector for the first estimated position of the mobile device based on a linearized range constraint, an orthogonal range constraint, and the estimated clock bias; and
determining a second estimated position of the mobile device using the correction vector;
wherein the linearized range constraint comprises a first linear equation specifying a condition along a first direction from the first estimated position of the mobile device toward the navigational transmitter;
wherein the orthogonal range constraint comprises a second linear equation with a zero component of the correction vector along a second direction orthogonal to the first direction.
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Accused Products
Abstract
Methods and apparatuses for location determination in wireless assisted positioning systems. In one aspect of the disclosed method and apparatus, a method to determine a position of a mobile device in a positioning system includes: computing a second estimated position of a mobile device using a first assumed geometric relationship for a location of the mobile device in relation to a navigational transmitter (e.g., a basestation, a pseudolite, or a Satellite Positioning System (SPS) satellite). The first geometric relationship is linearly independent from the altitude of the mobile device (e.g., obtained from an altitude aiding) and a second geometric relationship based on range information (e.g., a range from the mobile device to the navigational transmitter, a pseudorange, an arrival time, or a round trip time) measured with respect to the navigational transmitter. In another embodiment of the disclosed method and apparatus, the method to determine a position of a mobile device in a positioning system includes: determining an estimated clock bias from a strength indicator of a signal transmitted from a navigational transmitter to the mobile device.
23 Citations
26 Claims
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1. A method to determine a position of a mobile device in a positioning system, the method comprising:
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obtaining a first estimated position of the mobile device; determining an estimated clock bias from a strength indicator of a signal transmitted from a navigational transmitter to the mobile device; computing a correction vector for the first estimated position of the mobile device based on a linearized range constraint, an orthogonal range constraint, and the estimated clock bias; and determining a second estimated position of the mobile device using the correction vector; wherein the linearized range constraint comprises a first linear equation specifying a condition along a first direction from the first estimated position of the mobile device toward the navigational transmitter; wherein the orthogonal range constraint comprises a second linear equation with a zero component of the correction vector along a second direction orthogonal to the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory machine readable media containing executable computer program instructions which when executed by a digital processing system cause said system to perform a method to determine a position of a mobile device in a positioning system, the method comprising:
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obtaining a first estimated position of the mobile device; determining an estimated clock bias from a strength indicator of a signal transmitted from a navigational transmitter to the mobile device; computing a correction vector for the first estimated position of the mobile device based on a linearized range constraint, an orthogonal range constraint, and the estimated clock bias; and determining a second estimated position of the mobile device using the correction vector; wherein the linearized range constraint comprises a first linear equation specifying a condition along a first direction from the first estimated position of the mobile device toward the navigational transmitter; wherein the orthogonal range constraint comprises a second linear equation with a zero component of the correction vector along a second direction orthogonal to the first direction. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A digital processing system to determine the position of a mobile device in a positioning system, the processing system comprising:
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means for obtaining a first estimated position of the mobile device; means for determining an estimated clock bias from a strength indicator of a signal transmitted from a navigational transmitter to the mobile device; means for computing a correction vector for the first estimated position of the mobile device based on a linearized range constraint, an orthogonal range constraint, and the estimated clock bias; and means for determining a second estimated position of the mobile device using the correction vector; wherein the linearized range constraint comprises a first linear equation specifying a condition along a first direction from the first estimated position of the mobile device toward the navigational transmitter; wherein the orthogonal range constraint comprises a second linear equation with a zero component of the correction vector along a second direction orthogonal to the first direction. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A digital processing system to determine the position of a mobile device in a positioning system, the processing system comprising:
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a processor configured to; obtain a first estimated position of the mobile device; determine an estimated clock bias from a strength indicator of a signal transmitted from a navigational transmitter to the mobile device; compute a correction vector for the first estimated position of the mobile device based on a linearized range constraint, an orthogonal range constraint, and the estimated clock bias; and determine a second estimated position of the mobile device using the correction vector; wherein the linearized range constraint comprises a first linear equation specifying a condition along a first direction from the first estimated position of the mobile device toward the navigational transmitter; wherein the orthogonal range constraint comprises a second linear equation with a zero component of the correction vector along a second direction orthogonal to the first direction. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification