MAGNETOMETER CORRECTION SYSTEM AND METHOD
First Claim
Patent Images
1. A system for correcting a vehicle compass measurement for an interfering magnetic field, the interfering magnetic field having an intensity sufficient to cause a compass measurement error, the system comprising:
- a magnetic field sensor for measuring a magnetic field;
a compass control circuit coupled to the magnetic field sensor, the compass control circuit configured to control the magnetic field sensor and to process the magnetic field measured by the magnetic field sensor; and
wherein the compass control circuit is configured to determine a first magnetic field value and a second magnetic field value, such that the second magnetic field value is caused by a change in direction of the vehicle.
1 Assignment
0 Petitions
Accused Products
Abstract
A compass correction system and method which utilizes data from the vehicle bus, vehicle sensors and vehicle subsystems to determine a compass correction factor.
-
Citations
21 Claims
-
1. A system for correcting a vehicle compass measurement for an interfering magnetic field, the interfering magnetic field having an intensity sufficient to cause a compass measurement error, the system comprising:
-
a magnetic field sensor for measuring a magnetic field;
a compass control circuit coupled to the magnetic field sensor, the compass control circuit configured to control the magnetic field sensor and to process the magnetic field measured by the magnetic field sensor; and
wherein the compass control circuit is configured to determine a first magnetic field value and a second magnetic field value, such that the second magnetic field value is caused by a change in direction of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for correcting a vehicle compass measurement for an interfering magnetic field, the interfering magnetic field having an intensity sufficient to cause a compass measurement error, the method comprising:
-
monitoring an angular change of a vehicle;
detecting a first magnetic field value;
determining a second magnetic field value caused by the changing of direction of the vehicle based on the angular change of the vehicle;
determining a correction value based on the first magnetic field value and the second magnetic field value; and
storing the correction value in a memory. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A compass correction system, comprising:
-
a means for monitoring an angular change of a vehicle;
a means for detecting a first magnetic field value;
a means for determining a second magnetic field value caused by the changing of direction of the vehicle based on the angular change of the vehicle;
a means for determining a correction value based on the first magnetic field value and the second magnetic field value; and
a means for storing the correction value. - View Dependent Claims (18, 19)
-
-
20. A vehicle compass system for compensating for magnetic field values, the vehicle compass system comprising:
-
a magnetic field sensor being configured to determine an orientation of the magnetic field sensor with respect to the Earth'"'"'s magnetic field and to generate magnetic field data;
a control circuit coupled to a vehicle accessory and the magnetic field sensor, the control circuit being configured to receive a status signal from the vehicle accessory indicating whether the vehicle accessory has a status change, to receive magnetic field data from the magnetic field sensor, to receive a vehicle angular change signal from a vehicle angular change monitor; and
wherein when the vehicle angular change signal indicates a change in a vehicle angle, the control circuit is configured to determine a first magnetic field value and a second magnetic field value, such that the second magnetic field value is caused by a change in direction of the vehicle. - View Dependent Claims (21)
-
Specification