Bearing calculator and error correction method
First Claim
1. A mobile communication terminal apparatus comprising:
- a geomagnetic sensor for detecting earth-geomagnetism;
a displaying means; and
a control means for calculating a geographical bearing base on values detected by the geomagnetic sensor, and displaying the resultant bearing information on the display means, anda position information acquisition means for acquiring information concerning a geographical position where the mobile communication terminal apparatus is positioned at this time, the control meansdisplaying a map of the surrounding of a current position of the mobile communication terminal apparatus which is specified on the basis of the positional information acquired by the position information acquisition means, on the display means,displaying the bearing information included in the map on the display means, performing a control processing for controlling a direction of the map in a display screen of the display means in response to the calculated bearing, andstopping the control processing of the direction of the bearing when the detected value of the geomagnetic sensor becomes a predetermined abnormal state and the predetermined abnormal state lasts over a predetermined time, during the execution of the control processing, and then, fixing a predetermined bearing on the map to a predetermined direction on the display screen of the display means, and correcting the bearing information.
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Accused Products
Abstract
A bearing calculator provided with a geomagnetic sensor for detecting earth-geomagnetism and a control unit for calculating a geographical bearing based on detection values of the geomagnetic sensor. The control unit can execute offset error correction processing for correcting the offset error to the geomagnetic sensor based on a change in the magnetic field inside the bearing calculator. When detection values of the geomagnetic sensor enter an abnormal state, it performs said offset error correction processing when the abnormal state continues for a predetermined time, while does not perform the offset error correction processing when the abnormal state ends within a predetermined time.
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Citations
10 Claims
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1. A mobile communication terminal apparatus comprising:
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a geomagnetic sensor for detecting earth-geomagnetism; a displaying means; and
a control means for calculating a geographical bearing base on values detected by the geomagnetic sensor, and displaying the resultant bearing information on the display means, anda position information acquisition means for acquiring information concerning a geographical position where the mobile communication terminal apparatus is positioned at this time, the control means displaying a map of the surrounding of a current position of the mobile communication terminal apparatus which is specified on the basis of the positional information acquired by the position information acquisition means, on the display means, displaying the bearing information included in the map on the display means, performing a control processing for controlling a direction of the map in a display screen of the display means in response to the calculated bearing, and stopping the control processing of the direction of the bearing when the detected value of the geomagnetic sensor becomes a predetermined abnormal state and the predetermined abnormal state lasts over a predetermined time, during the execution of the control processing, and then, fixing a predetermined bearing on the map to a predetermined direction on the display screen of the display means, and correcting the bearing information. - View Dependent Claims (2, 3, 4, 5)
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6. A correction method for correcting an error of a geomagnetic sensor for detecting earth-geomagnetism, used in a mobile communication terminal apparatus comprising a position information acquisition means for acquiring an information concerning a geographical position where the mobile communication terminal apparatus is positioned at this time, and a display means for displaying a geographical bearing information calculated on the basis of the detected value of the geomagnetic sensor,
the correction method including; -
a first step for displaying a map of the surrounding of a current position of the mobile communication terminal apparatus which is specified on the basis of the positional information acquired by the position information acquisition means, on the display means, a second step for displaying the bearing information included in the map on the display means, a third step for performing a control processing for controlling a direction of the map in a display screen of the display means in response to the calculated bearing, and stopping the control processing of the direction of the bearing when the detected value of the geomagnetic sensor becomes a predetermined abnormal state and the predetermined abnormal state lasts over a predetermined time, during the execution of the control processing, and then, fixing a predetermined bearing on the map to a predetermined direction on the display screen of the display means, and correcting the bearing information, a fourth step for detecting the fact that the detected value of the geomagnetic sensor becomes a predetermined abnormal state under the status where the control of the direction of the map in the third step, a fifth step for monitoring whether or not the predetermined abnormal state being continued over a predetermined time, after the detection of the predetermined abnormal state, a sixth step for stopping the control of the direction of the map in the third step and correcting the bearing information, when the predetermined abnormal state has continued over a predetermined time, and a seventh step for displaying a predetermined bearing on the map on the displaying means in a condition where the predetermined bearing is fixed to a predetermined direction on the display screen of the display means. - View Dependent Claims (7, 8, 9, 10)
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Specification