SYSTEM, METHOD, DEVICE AND COMPUTER CODE PRODUCT FOR IMPROVING THE READABILITY OF AN ELECTRONIC COMPASS
First Claim
1. An electronic compass configured to provide a compass heading based on the Earth'"'"'s magnetic field, the compass comprising:
- a sensor configured to measure the Earth'"'"'s magnetic field and to provide sensor outputs signals indicative of the measured magnetic field;
a stabilizing filter configured to stabilize the compass heading in random tilt error conditions; and
a filter adaptation module configured to control the stabilizing filter response based on the sensor output signals and pre-calibrated compass radius information.
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Accused Products
Abstract
A system, method, device and computer code product is disclosed for stabilizing compass heading under tilt error conditions from an uncorrected electronic compass reading. Exemplary embodiments include a stabilizing filter configured to filter out tilt errors incorporated into the uncorrected electronic compass reading and a filter adaptation module configured to control the stabilizing filter response based on the signal radius of the uncorrected compass reading and a pre-calibrated ideal radius for the compass. The filter adaptation module can be configured to calculate a filter response parameter as a function of the relative difference between the signal radius of the uncorrected compass reading and the pre-calibrated ideal radius. The filter response parameter can be passed to the stabilizing filter for controlling its operation.
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Citations
24 Claims
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1. An electronic compass configured to provide a compass heading based on the Earth'"'"'s magnetic field, the compass comprising:
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a sensor configured to measure the Earth'"'"'s magnetic field and to provide sensor outputs signals indicative of the measured magnetic field;
a stabilizing filter configured to stabilize the compass heading in random tilt error conditions; and
a filter adaptation module configured to control the stabilizing filter response based on the sensor output signals and pre-calibrated compass radius information. - View Dependent Claims (2, 3, 4, 5)
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6. A device for stabilizing a compass heading display in random tilt error conditions in an electronic compass configured to measure the Earth'"'"'s magnetic field and produce an uncorrected compass reading based on the measured field, the device comprising:
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a stabilizing filter configured to filter random tilt error incorporated into the uncorrected compass reading; and
a filter adaptation module configured to control the stabilizing filter response based on the uncorrected compass reading and pre-calibrated compass radius information. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for filtering out tilt error in an electronic compass configured to produce an uncorrected compass reading indicative of compass heading, the method comprising:
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calculating a signal radius of the uncorrected compass reading;
calculating a filter response parameter based on the calculated signal radius and a pre-calibrated ideal compass radius; and
stabilizing the compass reading in tilt error conditions with a stabilizing filter based on the calculated filter response parameter. - View Dependent Claims (14, 15, 16)
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17. A computer code product for filtering out tilt error in an electronic compass configured to produce an uncorrected compass reading indicative of compass heading, the computer code product comprising:
computer code configured to;
calculate a signal radius of the uncorrected compass reading;
calculate a filter response parameter based on the calculated signal radius and a pre-calibrated ideal compass radius; and
stabilize the compass reading in tilt error conditions based on the filter response parameter. - View Dependent Claims (18, 19, 20)
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21. A mobile electronic device, the device comprising:
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an electronic compass configured to measure the Earth'"'"'s magnetic field and produce an uncorrected compass reading based on the measured field;
a stabilizing filter configured to filter random tilt error incorporated into the uncorrected compass reading; and
a filter adaptation module configured to control the stabilizing filter response based on the uncorrected compass reading and pre-calibrated compass radius information. - View Dependent Claims (22, 23, 24)
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Specification