Automatic correction of past position errors for location and inventory tracking
First Claim
1. A method for calibrating past position estimates from a positioning system that provides real-time position estimates of a mobile object, comprisingstoring the real-time position estimates as first past positions and aggregating the first past positions to form a first past trajectory, wherein the first past trajectory comprises at least three first past positions;
- generating a calibrated past trajectory based on the first past trajectory, wherein the calibrated past trajectory comprises second past positions and at least one of the second past positions is determined by using at least one of the first past positions that corresponds to an earlier time instance;
whereby the second past positions are closer to actual past positions of the mobile object than the first past positions and the calibrated past trajectory is closer to the actual past trajectory of the mobile object than the first past trajectory.
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Abstract
A method is provided for calibrating past position estimates from a positioning system that provides real-time position estimates of a mobile object. The method first stores the real-time position estimates, which as time goes by become past position estimates and naturally form a first past trajectory depicting the past movement of the mobile object. Subsequently, a calibrated past trajectory is determined, which includes calibrated past position estimates that correspond to the same time instances as the past positions in the first past trajectory. When real-time positions have low qualities, this method calibrates them at a later time by using (higher-quality) real-time positions both before and after them. Errors in the past positions are then corrected based on the calibrated past trajectory. When used with event detectors that indicate inventory transactions, this method can correct position errors associated with inventory events so as to improve the performance of inventory tracking.
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Citations
14 Claims
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1. A method for calibrating past position estimates from a positioning system that provides real-time position estimates of a mobile object, comprising
storing the real-time position estimates as first past positions and aggregating the first past positions to form a first past trajectory, wherein the first past trajectory comprises at least three first past positions; -
generating a calibrated past trajectory based on the first past trajectory, wherein the calibrated past trajectory comprises second past positions and at least one of the second past positions is determined by using at least one of the first past positions that corresponds to an earlier time instance; whereby the second past positions are closer to actual past positions of the mobile object than the first past positions and the calibrated past trajectory is closer to the actual past trajectory of the mobile object than the first past trajectory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification