Wireless Tracking System And Method With Multipath Error Mitigation
First Claim
1. A method for determining a real-time location of an object within an indoor facility, the method comprising:
- obtaining a plurality of sensor readings from a tag attached to the object;
generating a reading set comprising the plurality of sensor readings;
sorting the reading set by a plurality of physical regions;
selecting a first physical region of the plurality of physical regions, the first physical region composed of a first plurality of sensor readings having the highest average signal strength;
sorting the first plurality of sensor readings into a second plurality of sensor readings, each of the second plurality of sensor readings corresponding to a zone within the first physical region;
selecting a selected zone having the highest average reading; and
calculating a real-time location of the object from a plurality of the highest sensor readings from the second plurality of sensor readings corresponding to the selected zone.
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Accused Products
Abstract
A system (50) and method (300) for providing multipath error mitigation for real-time wireless tracking of an object (100) is disclosed herein. A plurality of sensor readings are obtained from a tag (60) attached to an object (100) within an indoor facility (70). A plurality of reading sets are generated and sorted by zones. A zone with the highest average reading is preferably selected and the location of the object (100) is calculated based on the selected zone readings. In this manner, faulty position readings are eliminated from the location calculation thereby allowing for more accurate tracking of the object (100) within the indoor facility (70).
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Citations
20 Claims
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1. A method for determining a real-time location of an object within an indoor facility, the method comprising:
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obtaining a plurality of sensor readings from a tag attached to the object;
generating a reading set comprising the plurality of sensor readings;
sorting the reading set by a plurality of physical regions;
selecting a first physical region of the plurality of physical regions, the first physical region composed of a first plurality of sensor readings having the highest average signal strength;
sorting the first plurality of sensor readings into a second plurality of sensor readings, each of the second plurality of sensor readings corresponding to a zone within the first physical region;
selecting a selected zone having the highest average reading; and
calculating a real-time location of the object from a plurality of the highest sensor readings from the second plurality of sensor readings corresponding to the selected zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for providing real-time location information for a plurality of non-stationary objects within an indoor facility, the system comprising:
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a plurality of stationary sensors, each of the plurality of stationary sensors positioned within the indoor facility;
a plurality of tags, each of the plurality of tags attached to one of the plurality of non-stationary objects, each of the plurality of tags having means for wirelessly transmitting to each of the plurality of stationary sensors tag specific data; and
means for processing the tag specific data to obtain a real-time reading set for the tag, to process the reading set to determine a first plurality of sensor readings with the highest average reading, to select a physical region within the indoor facility having the highest average reading, to select a zone within the physical region having the highest average reading, and to calculate the position of an object from the sensor readings positioned within the selected zone. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for determining a location of an object within a predetermined environment, the method comprising:
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transmitting a plurality of radiofrequency signals for a wireless tracking device to a positioning engine, the wireless tracking device attached to the object, each of the plurality of radiofrequency signals corresponding to a fixed signal transmitter within the environment;
processing each of the plurality of radiofrequency signals to determine the location of the fixed signal transmitter for each of the plurality of radiofrequency signals;
determining a probable region of the object based on the location of a majority of the fixed signal transmitter for each of the plurality of radiofrequency signals;
eliminating any of the plurality of radiofrequency signals corresponding from a fixed signal transmitter located outside of the probable region of the object; and
calculating the position of the object within the predetermined environment using only the plurality of radiofrequency signals corresponding to a fixed signal transmitter within the probable region of the object. - View Dependent Claims (17, 18)
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19. A system for providing real-time location information for a plurality of non-stationary objects within an indoor facility, the system comprising:
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a mapped space of a physical environment of the indoor facility; and
a processor comprising means for updating the mapped space in response to received measurements of the physical environment from one or more stationary sensors located within the indoor facility, means for generating a plurality of location hypotheses for a non-stationary object within the physical environment, at least one of the location hypotheses computed in response to measurement received from the non-stationary object and the mapped space, and means for generating a location estimate based on one or more of the plurality of location hypotheses, wherein one or more of the plurality of location hypotheses are selected based on a probability associated respectively therewith, and wherein a probability is computed in association with known barriers in the physical space. - View Dependent Claims (20)
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Specification