Method of Generating Geometric Heading and Positioning System Using the Same Method
First Claim
1. A method of generating a geometric heading during positioning, comprising:
- estimating a current declination information of a current position according to a declination database, wherein the declination database gathers a magnetic map and a plurality of declination information corresponding to a difference between a magnetic north and a geometric north at all grid positions on the magnetic map;
generating a predicted heading according to an angular velocity reading of a gyroscope and a magnetic heading reading of a magnetometer; and
generating the geometric heading according to the current declination information of the current position and the predicted heading.
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Abstract
A method of generating a geometric heading during positioning is provided. The method includes the following steps: estimating a current declination information of a current position according to a declination database, wherein the declination database gathers a magnetic map and a plurality of declination information corresponding to a difference between a magnetic north and a geometric north at all grid positions on the magnetic map; generating a predicted heading according to an angular velocity reading of a gyroscope and a magnetic heading reading of a magnetometer; and generating the geometric heading according to the current declination information of the current position and the predicted heading.
16 Citations
10 Claims
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1. A method of generating a geometric heading during positioning, comprising:
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estimating a current declination information of a current position according to a declination database, wherein the declination database gathers a magnetic map and a plurality of declination information corresponding to a difference between a magnetic north and a geometric north at all grid positions on the magnetic map; generating a predicted heading according to an angular velocity reading of a gyroscope and a magnetic heading reading of a magnetometer; and generating the geometric heading according to the current declination information of the current position and the predicted heading. - View Dependent Claims (2, 3, 4, 5)
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6. A positioning system for generating a geometric heading, comprising:
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an inertial unit, at least comprises a gyroscope for providing an angular velocity reading and a magnetometer for providing a magnetic heading reading; and a processor, arranged for executing the following steps; estimating a current declination information of a current position according to a declination database, wherein the declination database gathers a magnetic map and a plurality of declination information corresponding to a difference between a magnetic north and a geometric north at all positions on the magnetic map; generating a predicted heading according to the angular velocity reading of the gyroscope and the magnetic heading reading of the magnetometer; and generating the geometric heading according to the current declination information of the current position and the predicted heading. - View Dependent Claims (7, 8, 9, 10)
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Specification