Using statistical analysis to infer an accurate GPS location for use in tracking devices
First Claim
1. A method for improving the accuracy of a tracking device where the tracking device cannot achieve a complete fix using a location determination mechanism, the method comprising:
- determining a current position for the tracking device using incomplete information from the location determination mechanism;
adding the current position to a historical table of previous position determinations;
calculating a normalized center position from the current position and previous position determinations;
inferring the position of the tracking device from the normalized center position;
detecting the movement of the tracking device using an inertia sensor; and
clearing the historical table of previous positions in response to the detection of movement.
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Accused Products
Abstract
A system method for improving the accuracy of a tracking device is described where the tracking device cannot achieve an accurate GPS fix due to low observability. The system and method improves accuracy determining a current position for the tracking device using incomplete information from the GPS. The current position is added to a historical table of previous position determinations and a normalized center position is calculated from the current position and previous position determinations. The position of the tracking device is inferred from the normalized center position.
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Citations
15 Claims
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1. A method for improving the accuracy of a tracking device where the tracking device cannot achieve a complete fix using a location determination mechanism, the method comprising:
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determining a current position for the tracking device using incomplete information from the location determination mechanism; adding the current position to a historical table of previous position determinations; calculating a normalized center position from the current position and previous position determinations; inferring the position of the tracking device from the normalized center position; detecting the movement of the tracking device using an inertia sensor; and clearing the historical table of previous positions in response to the detection of movement. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for improving the accuracy of a tracking device where the tracking device cannot achieve a complete fix using a location determination mechanism, the system comprising:
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one or more tracking devices, each tracking device having a location determination mechanism for determining a current position for the tracking device, wherein the tracking device is operable to calculate a current position using incomplete information from the location determination mechanism, each of the one or more tracking devices including a communications interface and an inertia sensor in each of the one or more tracking devices, the inertia sensor used to detect the movement of the tracking device; and a monitoring center monitoring each of the one or more tracking devices using the communications interface of each tracking device; wherein the system is operable to calculate a normalized center position from the current position and a historical table of previous position determinations for each tracking device, and to infer the position of each of the tracking devices from the normalized center position, and wherein the historical table of previous position determinations is cleared when movement of the tracking device is detected. - View Dependent Claims (9, 10, 11, 12)
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13. A method for improving the accuracy of a tracking device where the tracking device cannot achieve a complete fix using GPS, the method comprising:
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determining a current position for the tracking device using incomplete information from the GPS; adding the current position to a historical table of previous position determinations; calculating a normalized weighted center position from the current position and previous position determinations; inferring the position of the tracking device from the normalized weighted center position; calculating an acceptable error radius around the normalized center position; detecting the movement of the tracking device using an inertia sensor; and clearing the historical table of previous positions in response to the detection of movement. - View Dependent Claims (14, 15)
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Specification