US 2015/0032399 A1 · HEADING CALIBRATION METHOD AND COMPASS SENSOR USING THE SAME

Abstract

A heading calibration method, adapted for a compass sensor is provided. The heading calibration method includes the following steps. R data segments are sequentially generated by rotating the compass sensor by a predetermined angle, wherein the data segments includes a plurality of magnetic data respectively. A partial calibration process is executed to calibrate a reference point coordinate according to the magnetic data in rth data segment and a initial value of the reference point coordinate, wherein r is between 1 and the R. Parts of the magnetic data in the rth data segment is extracted as whole data, and a whole calibration process is executed according to the whole data to update an initial value of the reference point coordinate. The partial calibration process is executed according to the updated initial value of the reference point coordinate and the magnetic data in a (r+1)th data segment.

Claims12

Dependent claims

A heading calibration method, adapted to a compass sensor, the heading calibration method comprising:

sequentially generating R data segments by rotating the compass sensor by a predetermined angle, wherein the R data segments respectively comprise a plurality of magnetic data;
executing a partial calibration process to calibrate a reference point coordinate of the compass sensor according to the magnetic data in a rth data segment of the R data segments and an initial value of the reference point coordinate, wherein r is between 1 and R−1;
taking a sampling interval as a unit to extract parts of the magnetic data in the rth data segment as whole data, and executing a whole calibration process according to the whole data to update the initial value of the reference point coordinate;
and
executing the partial calibration process according to the updated initial value of the reference point coordinate and the magnetic data in a (r+1)th data segment of the R data segments.

2 more elements

A compass sensor, comprising:

a magnetic detection unit, sequentially generating R data segments by rotating a predetermined angle, wherein the R data segments respectively comprise a plurality of magnetic data;
a processing unit, coupled to the magnetic detection unit,
wherein the processing unit executes a partial calibration process to calibrate a reference point coordinate according to the magnetic data in a rth data segment of the R data segments and an initial value of the reference point coordinate, wherein r is between 1 and R−1,
the processing unit takes a sampling interval as a unit to extract parts of the magnetic data in the rth data segment as whole data, and executes a whole calibration process according to the whole data to update the initial value of the reference point coordinate, and
the processing unit executes the partial calibration process according to the updated initial value of the reference point coordinate and the magnetic data in a (r+1)th data segment of the R data segments.

2 more elements

Dependencies are inferred from the claim text.

Heading calibration method and compass sensor using the same

Life of this patent

Heading calibration method and compass sensor using the same

Life of this patent

Abstract

Claims12