A full-attitude capture method and device based on a magnetic sensor and a star sensor

Abstract

A full-attitude capture method based on a magnetic sensor and a star sensor in the present invention includes: (1) obtaining an angular velocity of the satellite attitude through a gyroscope; (2) judging whether the angular velocity is within the first threshold range, and if not, using magnetic The torque sensor performs rate damping to adjust the angular velocity to within the first threshold range; (3) obtain a sun vector through the magnetic sensor; (4) judge whether the angle between the normal of the satellite sail and the sun vector is within a second If it is not in the threshold range, use the momentum wheel to rotate the satellite so that the included angle is adjusted to be within the second threshold range; (5) measure the earth’s magnetic field strength vector through the magnetic sensor to obtain an attitude angle of the satellite relative to the earth; ( 6) Determine whether the attitude angle is within the third threshold range, if not, use the momentum wheel to rotate the satellite to adjust the attitude angle to within the third threshold range; (7) Obtain the satellite attitude quaternion through the star sensor number to determine the attitude information of the satellite.

Description

technical field [0001] The invention relates to the technical field of aerospace attitude control, in particular to a method and device for capturing full attitude based on a magnetic sensor and a star sensor. Background technique [0002] During the operation of the satellite, due to some unknown reason, its attitude is abnormal. In order to avoid the loss of control of the satellite, the satellite uses the full attitude acquisition mode to ensure the safety of the satellite. In the attitude capture stage, it is very necessary to use a full field of view effective sensor to complete the attitude capture task. In addition, to obtain accurate attitude information, it is also necessary to provide high-precision sensors. At present, most of the full-attitude capture methods use the sun sensor to measure the attitude information, but it will be limited by the field of view (that is, the range angle that the sensor can observe) and the shadow area of ​​the ground. Therefore, whe...

AI Technical Summary

Problems solved by technology

At present, most of the full-attitude capture methods use the sun sensor to measure the attitude information, but it will be limited by the field of view (that is, the range angle that the sensor can observe) and the shadow area of ​​the ground. Therefore, when the full-attitude capture mode needs When the field of view of the sun sensor is realized or exceeded in the shadow area of ​​the earth, the sensor information is invalid, so the attitude capture task cannot be completed. If the satellite attitude rolls over, it will pose a threat to the safety of the satellite.

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