INDOOR POSITIONING SYSTEM AND METHOD HAVING IMPROVED ACCURACY
First Claim
1. An indoor positioning system having improved accuracy, comprising:
- a database storing spatial information corresponding to a predetermined space and position information of a plurality of radiofrequency transmitters disposed in the space;
a communications module receiving one or more pieces of measurement information from a user terminal that has received radiofrequency signals output from the plurality of radiofrequency transmitters, the measurement information including identification information of the plurality of radiofrequency transmitters included in the radiofrequency signals and signal strength information of the radiofrequency signals, and sensing information obtained by measuring a movement of the user terminal;
a first position measurement module, when an object is determined to be present between the user terminal and the plurality of radiofrequency transmitters in the space based on the spatial information, the position information and the measurement information, the first position measurement module correcting the signal strength information and measuring a first position of the user terminal based on the corrected signal strength information;
a second position measurement module measuring a second position of the user terminal using pedestrian dead reckoning based on the sensing information; and
a control module measuring a current position of the user terminal by specifying the first position measured by the first position measurement module as an initial position and updating the second position using the specified initial position.
1 Assignment
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Accused Products
Abstract
A system and method for indoor positioning is disclosed. The indoor positioning system and method significantly improve accuracy of indoor positioning by measuring an indoor position using radiofrequency (RF) signals output from RF transmitters (e.g. a beacon) and by using position information measured by pedestrian dead reckoning (PDR) using sensing information obtained by sensing movement of a user terminal. For measuring an position inside a building using RF transmitters, error caused by internal structures of the building (walls, doors) can be corrected using spatial information (3D model of the building), positions of the RF transmitters, and information of a predetermined area allowed for user access inside the building.
20 Citations
17 Claims
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1. An indoor positioning system having improved accuracy, comprising:
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a database storing spatial information corresponding to a predetermined space and position information of a plurality of radiofrequency transmitters disposed in the space; a communications module receiving one or more pieces of measurement information from a user terminal that has received radiofrequency signals output from the plurality of radiofrequency transmitters, the measurement information including identification information of the plurality of radiofrequency transmitters included in the radiofrequency signals and signal strength information of the radiofrequency signals, and sensing information obtained by measuring a movement of the user terminal; a first position measurement module, when an object is determined to be present between the user terminal and the plurality of radiofrequency transmitters in the space based on the spatial information, the position information and the measurement information, the first position measurement module correcting the signal strength information and measuring a first position of the user terminal based on the corrected signal strength information; a second position measurement module measuring a second position of the user terminal using pedestrian dead reckoning based on the sensing information; and a control module measuring a current position of the user terminal by specifying the first position measured by the first position measurement module as an initial position and updating the second position using the specified initial position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An indoor positioning method comprising:
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storing, by an indoor positioning system having improved accuracy, spatial information corresponding to a predetermined space and position information regarding a plurality of radiofrequency transmitters disposed in the space; receiving, by the indoor positioning system, one or more pieces of measurement information from a user terminal that has received radiofrequency signals output from the plurality of radiofrequency transmitters, the measurement information including identification information of the plurality of radiofrequency transmitters included in the radiofrequency signals and signal strength information of the radiofrequency signals, and sensing information obtained by measuring a movement of the user terminal; when an object is determined to be present between the user terminal and the plurality of radiofrequency transmitters in the space based on the spatial information, the position information, and the measurement information, correcting, by the indoor positioning system, the signal strength information and measuring a first position of the user terminal based on the corrected signal strength information; measuring, by the indoor positioning system, a second position of the user terminal using pedestrian dead reckoning based on the sensing information; and measuring, by the indoor positioning system, a current position of the user terminal by specifying the first position measured by the first position measurement module as an initial position and updating the second position using the specified initial position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification