Method of processing output data from geomagnetic sensor
First Claim
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1. A method of processing the output data of a geomagnetic sensor mounted on a vehicle for producing data indicating the direction of said vehicle on the basis of geomagnetism, comprising the steps of:
- (a) sampling output data of said geomagnetic sensor at a predetermined rate;
(b) determining a permissible range of variance of said output data from sample to sample, said range being determined in accordance with the maximum angular velocity of said vehicle at at least one linear speed;
(c) detecting whether a most recent sample of said output data varies from an immediately preceding sample by an amount outside of said permissible range, and, in this event,(d) replacing said most recent sample with one of;
(i) the immediately preceding sample; and
(ii) an average of plural preceding samples.
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Abstract
A geomagnetic sensor used for vehicle-mount navigational apparatus outputs data indicative of the vehicle'"'"'s direction. If the output data from the geomagnetic sensor is out of a predetermined range, the data is replaced by predetermined data or corrected on the basis of the predetermined data.
103 Citations
5 Claims
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1. A method of processing the output data of a geomagnetic sensor mounted on a vehicle for producing data indicating the direction of said vehicle on the basis of geomagnetism, comprising the steps of:
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(a) sampling output data of said geomagnetic sensor at a predetermined rate; (b) determining a permissible range of variance of said output data from sample to sample, said range being determined in accordance with the maximum angular velocity of said vehicle at at least one linear speed; (c) detecting whether a most recent sample of said output data varies from an immediately preceding sample by an amount outside of said permissible range, and, in this event, (d) replacing said most recent sample with one of; (i) the immediately preceding sample; and (ii) an average of plural preceding samples. - View Dependent Claims (2)
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3. A method of processing the output data of a geomagnetic sensor mounted on a vehicle for producing data indicating the direction of said vehicle on the basis of geomagnetism, comprising the steps of:
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(a) sampling output data of said geomagnetic sensor at a predetermined rate; (b) determining a permissible range of variance of said output data from sample to sample; (c) detecting whether successive samples of said output data vary from an immediately preceding sample by an amount outside of said permissible range; and (d) if said successive samples fall outside of said permissible range in a predetermined number of successive detections, redetermining a base coordinate system for said geomagnetic sensor on the basis of independently measured direction data. - View Dependent Claims (4, 5)
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Specification