Concept for localizing a position on a path
First Claim
1. An apparatus for localizing a current position of a terminal device or for navigating the terminal device on a guidance path, radio signals of fixedly positioned radio transmitters being receivable along the path, the apparatus comprising:
- a comparator arranged to compare previously recorded electromagnetic properties of the radio signals of the fixedly positioned radio transmitters, which unambiguously identify a measurement point, so as to examine several reference paths to search for an intersection point on the basis of common features of the previously recorded electromagnetic properties, wherein the intersection point characterizes an identical geographic position in different reference paths, and to interconnect the reference paths to form a graph, the intersection point and the current position of the terminal device being regarded as nodes, and portions of paths between the intersection point and the current position of the terminal device being regarded as edges of the graph, and a reference path being distinguished by a temporal succession of the previously recorded electromagnetic properties;
a guidance path determiner arranged to determine the guidance path from the current position to the intersection point, the guidance path determiner being configured to determine the guidance path by use of a routing algorithm on the basis of the graph, the guidance path having associated previously recorded electromagnetic properties; and
a properties determiner arranged to determine current properties of the radio signals of the fixedly positioned radio transmitters at the current position of the terminal device, the current properties of the radio signals comprising electromagnetic properties of the radio signals of the fixedly positioned radio transmitters;
whereinthe comparator is configured to compare the current electromagnetic properties of the radio signals with the previously recorded electromagnetic properties of the radio signals associated with the guidance path, and to determine a relation between the current position of the terminal device and the guidance path on the basis of a result of the comparison.
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Accused Products
Abstract
An apparatus for localizing a position on a path, radio signals of fixedly positioned radio transmitters being receivable along the path, the apparatus including a determiner for determining properties of the radio signals of the fixedly positioned radio transmitters at the position, and a comparator for comparing the determined electromagnetic properties with previously recorded properties which characterize a reference path, and for determining a relation between the position and the reference path on the basis of a result of the comparison.
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Citations
15 Claims
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1. An apparatus for localizing a current position of a terminal device or for navigating the terminal device on a guidance path, radio signals of fixedly positioned radio transmitters being receivable along the path, the apparatus comprising:
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a comparator arranged to compare previously recorded electromagnetic properties of the radio signals of the fixedly positioned radio transmitters, which unambiguously identify a measurement point, so as to examine several reference paths to search for an intersection point on the basis of common features of the previously recorded electromagnetic properties, wherein the intersection point characterizes an identical geographic position in different reference paths, and to interconnect the reference paths to form a graph, the intersection point and the current position of the terminal device being regarded as nodes, and portions of paths between the intersection point and the current position of the terminal device being regarded as edges of the graph, and a reference path being distinguished by a temporal succession of the previously recorded electromagnetic properties; a guidance path determiner arranged to determine the guidance path from the current position to the intersection point, the guidance path determiner being configured to determine the guidance path by use of a routing algorithm on the basis of the graph, the guidance path having associated previously recorded electromagnetic properties; and a properties determiner arranged to determine current properties of the radio signals of the fixedly positioned radio transmitters at the current position of the terminal device, the current properties of the radio signals comprising electromagnetic properties of the radio signals of the fixedly positioned radio transmitters;
whereinthe comparator is configured to compare the current electromagnetic properties of the radio signals with the previously recorded electromagnetic properties of the radio signals associated with the guidance path, and to determine a relation between the current position of the terminal device and the guidance path on the basis of a result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of localizing a current position of a terminal device or for navigating the terminal device on a guidance path, radio signals of fixedly positioned radio transmitters being receivable along the path, the method comprising:
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comparing previously recorded electromagnetic properties of the radio signals, which unambiguously identify a measurement point, of several reference paths so as to search, on the basis of common features of the previously recorded electromagnetic properties, for an intersection point, wherein an intersection point characterizes an identical geographic position in different reference paths, a reference path being distinguished by a temporal succession of previously recorded electromagnetic properties of the radio signals; interconnecting the reference paths to form a graph, an intersection point and a current position of the terminal device being regarded as nodes, and portions of paths between the intersection point and the current position of the terminal device being regarded as edges of the graph; determining the guidance path from the current position to the intersection point by use of a routing algorithm on the basis of the graph, the guidance path having associated previously recorded electromagnetic properties; and receiving the radio signals at the current position of the terminal device on the guidance path; determining current properties of the radio signals at the current position of the terminal device on the guidance path, the current properties comprising electromagnetic properties of the radio signals; and comparing the current electromagnetic properties with the previously recorded electromagnetic properties associated with the guidance path; and determining a relation between the current position of the terminal device and the guidance path on the basis of a result of the comparison. - View Dependent Claims (15)
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Specification