Method and apparatus for positioning a mobile station
First Claim
1. A positioning apparatus for determining a current position of a mobile station located in a communication area utilizing radio waves arriving from a plurality of base stations installed in said communication area, said positioning apparatus disposed in said mobile station, comprising:
- a received signal generating part which receives radio waves arriving from said plurality of base stations to generate a received signal in accordance with each received radio wave;
a direct wave candidate extracting part which extracts at least one or more direct wave candidate for each base station from the respective radio waves arriving from said plurality of base stations based on said received signals;
a direct wave candidate estimating part which performs predetermined error correction processing on a direct wave candidate extracted by said direct wave candidate extracting part to estimate at least one or more corrected direct wave candidate;
a direct wave deriving part which derives a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within the direct wave candidates and corrected direct wave candidate extracted and estimated in said direct wave candidate extracting part and said direct wave candidate estimating part; and
a positioning calculating part which determines the current position of said mobile station based on the received signal corresponding to the true direct wave derived by said direct wave deriving part.
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Accused Products
Abstract
A positioning apparatus and method for accurately determining a current position of a mobile station. The current position of the mobile station is determined utilizing radio waves arriving from a plurality of base stations installed in a communication area. For calculating a propagation range of a radio wave arriving from each base station, error correction processing is performed using a predetermined error correction coefficient previously calculated by measuring a radio wave propagation situation around each base station to estimate a propagation range of a direct wave within incoming radio waves. The current position of the mobile station is determined using the estimated propagation range and the positions of the respective base station.
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Citations
28 Claims
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1. A positioning apparatus for determining a current position of a mobile station located in a communication area utilizing radio waves arriving from a plurality of base stations installed in said communication area, said positioning apparatus disposed in said mobile station, comprising:
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a received signal generating part which receives radio waves arriving from said plurality of base stations to generate a received signal in accordance with each received radio wave;
a direct wave candidate extracting part which extracts at least one or more direct wave candidate for each base station from the respective radio waves arriving from said plurality of base stations based on said received signals;
a direct wave candidate estimating part which performs predetermined error correction processing on a direct wave candidate extracted by said direct wave candidate extracting part to estimate at least one or more corrected direct wave candidate;
a direct wave deriving part which derives a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within the direct wave candidates and corrected direct wave candidate extracted and estimated in said direct wave candidate extracting part and said direct wave candidate estimating part; and
a positioning calculating part which determines the current position of said mobile station based on the received signal corresponding to the true direct wave derived by said direct wave deriving part. - View Dependent Claims (3, 4, 5, 6, 8, 9, 10)
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2. A positioning apparatus for determining a current position of a mobile station utilizing a radio wave emitted from said mobile station located in a communication area and arriving at a plurality of base stations installed in said communication area, said positioning apparatus disposed in each of said base stations, comprising:
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a received signal generating part provided in each of said plurality of base stations which receives a radio wave arriving from said mobile station to generate a received signal in accordance with each received radio wave;
a direct wave candidate extracting part which extracts at least one or more direct wave candidate for each base station from each radio wave arriving at each of said plurality of base stations based on said received signal;
a direct wave candidate estimating part which performs predetermined error correction processing on the direct wave candidate extracted by said direct wave candidate extracting part to estimate at least one ore more corrected direct wave candidate;
a direct wave deriving part which derives a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within the direct wave candidates and corrected direct wave candidate extracted and estimated in said direct wave candidate extracting part and said direct wave candidate estimating part; and
a positioning calculating part which determines the current position of said mobile station based on the received signal corresponding to the true direct wave derived by said direct wave deriving part. - View Dependent Claims (7, 11, 12, 27)
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13. A positioning method for determining a current position of a mobile station located in a communication area utilizing radio waves arriving from a plurality of base stations installed in said communication area, method comprising:
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a first step of receiving radio waves arriving from said plurality of base stations to generate a received signal in accordance with each received radio wave;
a second step of extracting at least one or more direct wave candidate for each base station from the respective radio waves arriving from said plurality of base stations based on said received signals;
a third step of performing predetermined error correction processing on a direct wave candidate extracted in said second step to estimate at least one or more corrected direct wave candidate;
a fourth step of deriving a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within the direct wave candidates and corrected direct wave candidate extracted and estimated in said second step and said third step; and
a fifth step of determining the current position of said mobile station based on the received signal corresponding to the true direct wave derived in said fourth step. - View Dependent Claims (15, 16, 17, 18, 20, 21, 22)
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14. A positioning method for determining a current position of a mobile station utilizing a radio wave emitted from said mobile station located in a communication area and arriving at a plurality of base stations installed in said communication area, said positioning method, comprising:
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a first step of receiving a radio wave arriving from said mobile station to generate a received signal in accordance with each received radio wave;
a second step of extracting at least one or more direct wave candidate for each base station from each radio wave arriving at each of said plurality of base stations based on said received signal;
a third step of performing predetermined error correction processing on the direct wave candidate extracted in said second step to estimate at least one or more corrected direct wave candidate;
a fourth step of deriving a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within the direct wave candidates and corrected direct wave candidate extracted and estimated in said second step and said third step; and
a fifth step of determining the current position of said mobile station based on the received signal corresponding to the true direct wave derived in said fourth step. - View Dependent Claims (19, 23, 24, 28)
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25. A positioning system for determining a current position of a mobile station located in a communication area in which a plurality of base stations are installed, wherein:
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said mobile station comprises;
a received signal generating part which receives radio waves arriving from said plurality of base stations to generate a received signal in accordance with each received radio wave;
a direct wave candidate extracting part which extracts at least one or more direct wave candidate for each base station from the respective radio waves arriving from said plurality of base stations based on said received signals;
a direct wave candidate estimating part which performs predetermined error correction processing on a direct wave candidate extracted by said direct wave candidate extracting part to estimate at least one or more corrected direct wave candidate;
a direct wave deriving part which derives a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within a plurality of direct wave candidates extracted and estimated in said direct wave candidate extracting part and said direct wave candidate estimating part; and
a positioning calculating part which determines the current position of said mobile station based on the received signal derived by said direct wave deriving part, wherein the current position of said mobile station is determined in said mobile station utilizing radio waves arriving at said mobile station from a plurality of base stations installed in said communication area.
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26. A positioning system for determining a current position of a mobile station located in a communication area in which a plurality of base stations are installed, said system comprising:
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a received signal generating part provided in each of said plurality of base stations which receives a radio wave arriving from said mobile station to generate a received signal in accordance with each received radio wave;
a direct wave candidate extracting part which extracts at least one or more direct wave candidate for each base station from each radio wave arriving at each of said plurality of base stations based on said received signal;
a direct wave candidate estimating part which performs predetermined error correction processing on the direct wave candidate extracted by said direct wave candidate extracting part to estimate at least one or more corrected direct wave candidate;
a direct wave deriving part which derives a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within a plurality of direct wave candidates extracted and estimated in said direct wave candidate extracting part and said direct wave candidate estimating part; and
a positioning calculating part which determines the current position of said mobile station based on the received signal derived by said direct wave deriving part, wherein the current position of said mobile station is determined in a base station, utilizing a radio wave emitted from said mobile station and arriving at said plurality of base stations.
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Specification