Patent Document ID: 8392142
Application ID: 12386180
Patent Status: 1

Claim One:
1. A method for algorithmically reducing the magnetic self-noise of a vehicle conducting magnetic anomaly detection, the method comprising: calculating the calibration coefficients u, v, and w, said calculating of the calibration coefficients u, v, and w including using a computer and using calibration data electrically received by the computer and electrically transmitted by said at least one magnetic sensor and said at least one vehicle attitude sensor; and calculating the magnetic self-noise of the vehicle due to induced magnetization and permanent magnetization, said calculating of the magnetic self-noise including using the computer, using the calculated said u, v, and w, and using magnetic anomaly detection data electrically received by the computer and electrically transmitted by said at least one magnetic sensor and said at least one vehicle attitude sensor; wherein 
 B X IM +B X PM =u 1 R 11 +u 2 R 12 +u 3 R 13 +u 4 R 21 +u 5 R 22 +u 6 R 23 +u 7 R 31 +u 8 R 32 +u 9 R 33 +p xyz ; 
 B Y IM +B Y PM =v 1 R 11 +v 2 R 12 +v 3 R 13 +v 4 R 21 +v 5 R 22 +v 6 R 23 +v 7 R 31 +v 8 R 32 +v 9 R 33 +p xyz ; 
 B Z IM +B Z PM =w 1 R 11 +w 2 R 12 +w 3 R 13 +w 4 R 21 +w 5 R 22 +w 6 R 23 +w 7 R 31 +w 8 R 32 +w 9 R 33 +p xyz ; R = [ cos ⁡ ( β ) ⁢ cos ⁡ ( γ ) cos ⁡ ( β ) ⁢ sin ⁡ ( γ ) - sin ⁡ ( β ) sin ⁡ ( α ) ⁢ sin ⁡ ( β ) ⁢ cos ⁡ ( γ ) - cos ⁡ ( α ) ⁢ sin ⁡ ( γ ) sin ⁡ ( α ) ⁢ sin ⁡ ( β ) ⁢ sin ⁡ ( γ ) + cos ⁡ ( α ) ⁢ cos ⁡ ( γ ) sin ⁡ ( α ) ⁢ cos ⁡ ( β ) cos ⁡ ( α ) ⁢ sin ⁡ ( β ) ⁢ cos ⁡ ( γ ) + sin ⁡ ( α ) ⁢ sin ⁡ ( γ ) cos ⁡ ( α ) ⁢ sin ⁡ ( β ) ⁢ sin ⁡ ( γ ) - sin ⁡ ( α ) ⁢ cos ⁡ ( γ ) cos ⁡ ( α ) ⁢ cos ⁡ ( β ) ] ; R = [ R 11 R 12 R 12 R 21 R 22 R 23 R 31 R 32 R 33 ] ; u is a coefficient corresponding to the magnetic self-noise in the x-direction due to induced magnetization of the vehicle; v is a coefficient corresponding to the magnetic self-noise in the v-direction due to induced magnetization of the vehicle; w is a coefficient corresponding to the magnetic self-noise in the z-direction due to induced magnetization of the vehicle; p xyz a coefficient corresponding to the magnetic self-noise due to the permanent magnetization of the vehicle; matrix R represents rotation, of the magnetic field applied to the vehicle, from the earth's coordinate system into the vehicle's coordinate system; B X IM is the magnetic self-noise in the x-direction due to induced magnetization of the vehicle; B X PM is the magnetic self-noise in the x-direction due to the permanent magnetization of the vehicle; B Y IM the magnetic self-noise in the y-direction due to the induced magnetization of the vehicle; B Y PM is the magnetic self-noise in the y-direction due to the permanent magnetization of the vehicle; B Z IM is the magnetic self-noise in the z-direction due to the induced magnetization of the vehicle; B Z PM is the magnetic self-noise in the z-direction due to the permanent magnetization of the vehicle; R ij is the ith by jth element of the matrix R; α is the pitch of the vehicle; β is the roll of the vehicle; γ is the heading of the vehicle.