A Method of Calculating Aircraft Attitude Using Geomagnetic Information and Gravity Sensor

A technology of gravity sensor and magnetoresistive sensor, which is applied in attitude control, instrumentation, ground navigation, etc., can solve problems such as roll angle calculation error divergence, achieve the effects of reducing measurement error, improving measurement accuracy, and avoiding blind spots

Active Publication Date: 2021-08-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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AI Technical Summary

Problems solved by technology

Even if the measurement accuracy of the magnetoresistive sensor reaches an ideal state, when the angle between the projectile axis and the magnetic north is small, the error in the calculation of the roll angle will tend to a certain extent due to errors in the measurement of the pitch angle and yaw angle. to diverge

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  • A Method of Calculating Aircraft Attitude Using Geomagnetic Information and Gravity Sensor
  • A Method of Calculating Aircraft Attitude Using Geomagnetic Information and Gravity Sensor
  • A Method of Calculating Aircraft Attitude Using Geomagnetic Information and Gravity Sensor

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Embodiment 1

[0111] The geomagnetic information in the Beijing area is that the magnetic field strength M=54617.0nT, the magnetic inclination I=59°6′39″, and the magnetic declination D=-6°51′3″. For the sake of convenience, it is noted that the angle between the projection of the missile launching direction on the horizontal plane and the magnetic north is ψ, and the east direction of the magnetic north is taken as positive.

[0112] Through the simulation calculation performed by Matlab software, the components of the magnetic field strength on the projectile section are obtained under different launch directions and different pitch angles, as shown in Figure 6-1 and 6-2 shown.

[0113] Depend on Figure 6-1 and Figure 6-2 It can be obtained that when the angle between the bomb axis and the magnetic north direction is smaller, or with the pitching motion of the bomb, when the angle between the bomb axis and the direction of the magnetic induction line is smaller, the magnetic field i...

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Abstract

The invention provides a method for calculating the attitude of an aircraft using geomagnetic information and a gravity sensor. In the method, the roll angle of the aircraft is -90° to 90°, and the maneuvering overload of the aircraft is less than the value of the acceleration of gravity. Adaptive least squares is adopted The filtering method determines the measurement noise covariance matrix according to the angle change between the longitudinal axis of the aircraft and the geomagnetic vector, and adjusts the measurement noise covariance matrix with the measurement error of the magnetoresistive sensor and the gravity sensor as the weight to achieve the optimum roll angle of the aircraft. Excellent estimate. This method can eliminate the influence of the measurement blind area of ​​the aircraft through the cooperation of the geomagnetic information and the gravity sensor.

Description

technical field [0001] The invention relates to a method for calculating the attitude of a flying object by using geomagnetic information and a gravity sensor, in particular to a method for calculating the spatial blind area and inherent deviation of the roll angle of the flying object by using the geomagnetic information and a gravity sensor. Background technique [0002] Magnetoresistive sensors are made based on the magnetoresistance effect of magnetic materials. There are four magnetoresistive units inside the sensor to form a Wheatstone bridge. When an external magnetic field is applied to the sensor, the magnetization direction of two of the magnetoresistance units that are placed opposite to each other will turn toward the direction of the current, causing the resistance value to increase; the other two relative Rotation of the magnetization direction of the placed magnetoresistive unit against the direction of current flow causes the resistance value to decrease. Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/00G01C21/08G01C21/20G01C1/00G05D1/08
CPCG01C1/00G01C21/005G01C21/08G01C21/20G05D1/0808
Inventor 李晨迪林德福杨哲王江王伟王辉李虹言陈斯程文伯纪毅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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