Portable position detector and position management system
First Claim
1. A portable position detector for detecting a moved position of a walking body, comprising:
- walking-motion detection means for measuring a value related to a walking motion caused by movement of said walking body;
moved-distance estimation means for estimating a moved distance, based on an output of said walking-motion detection means;
moved-direction detection means for detecting a direction of said walking body or a direction-movement caused by movement of said walking body;
moved-direction determination means for detecting points at which the body of said walking body arrives at substantially a highest position and/or lands by walking, based on said value measured by said walking-motion detection means, and also for determining a moved direction at a specific point as a specific moved direction, the specific point being related to at least one of said detected two points and also being specified in a range in which said body is between said highest-position arrival point and a highest-position arrival point that is obtained by the next walking step; and
moved-position estimation means for estimating a position of said walking body after movement, based on said moved distance of said walking body estimated by said moved-distance estimation means and said specific moved direction determined by said moved-direction determination means.
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Abstract
A portable position detector and a position management system that are capable of accurately detecting the direction of a walking body even when GPS signals cannot be received (or without reception) and thereby enhancing the accuracy of the dead reckoned position of the walking body.
The portable position detector is equipped with a pedometer and a geomagnetic sensor. With the pedometer, the moved distance of a walker is detected by a calculation of "the number of steps×the length of a step". The moved direction is detected with the geomagnetic sensor. With this, the moved position of the walker is accurately detected by the self-contained navigation system. Particularly, even in the case where the position detector is located in a forest or between buildings where a signal cannot be received from a global positioning system (GPS) due to high buildings, banks, and forests, the position detector with a portable size and weight applicable to a walker can know with a practically sufficient degree of accuracy the position of a person carrying this portable detector by the self-contained navigation system.
164 Citations
13 Claims
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1. A portable position detector for detecting a moved position of a walking body, comprising:
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walking-motion detection means for measuring a value related to a walking motion caused by movement of said walking body; moved-distance estimation means for estimating a moved distance, based on an output of said walking-motion detection means; moved-direction detection means for detecting a direction of said walking body or a direction-movement caused by movement of said walking body; moved-direction determination means for detecting points at which the body of said walking body arrives at substantially a highest position and/or lands by walking, based on said value measured by said walking-motion detection means, and also for determining a moved direction at a specific point as a specific moved direction, the specific point being related to at least one of said detected two points and also being specified in a range in which said body is between said highest-position arrival point and a highest-position arrival point that is obtained by the next walking step; and moved-position estimation means for estimating a position of said walking body after movement, based on said moved distance of said walking body estimated by said moved-distance estimation means and said specific moved direction determined by said moved-direction determination means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A position management system comprising:
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a portable position detector for detecting a moved position of a walking body, the portable position detector including (1) walking-motion detection means for measuring a value related to a walking motion caused by movement of said walking body, (2) moved-distance estimation means for estimating a moved distance, based on an output of said walking-motion detection means, (3) moved-direction detection means for detecting a direction of said walking body or a direction of said movement caused by movement of walking of said walking body, (4) moved-direction determination means for detecting points at which the body of said walking body arrives at substantially a highest position and/or lands by walking based on said value measured by said walking-motion detection means, and also for determining a moved direction at a specific point as a specific moved direction, the specific point being related to at least one of said detected two points and also being specified in a range in which said body is between said highest-position arrival point and a highest-position arrival point that is obtained by the next walking step, (5) moved-position estimation means for estimating a position of said walking body after movement, based on said moved distance of said walking body estimated by said moved-distance estimation means and said specific moved direction determined by said moved-direction determination means, and (6) transmission means for transmitting at least one piece of information of output information from said walking-motion detection means, from said moved-distance estimation means, from said moved-direction determination means, and from said moved-position estimation means; and a base station including (1) reception means for receiving the output information transmitted by said transmission means of said portable position detector and (2) display means for displaying a moved position of said portable position detector, based on the information from said reception means. - View Dependent Claims (13)
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Specification