Magnetic sensor and star sensor-based full attitude capture method and device thereof

Abstract

The invention provides a magnetic sensor and star sensor-based full attitude capture method which comprises the steps: (1) obtaining an angular velocity of satellite attitudes through a gyro; (2) judging whether the angular velocity is within the range of a first threshold value, if not, carrying out rate damping through a magnetic torquer, so that the angular velocity is adjusted to be within the range of the first threshold value; (3) obtaining a sun vector by a magnetic sensor; (4) judging whether the inclined angle between the normal of a satellite sailboard and the sun vector is within the range of a second threshold value, if not, enabling the satellite to rotate by a momentum wheel, so that the inclined angle is adjusted to be within the range of the second threshold value; (5) measuring the earth magnetic field intensity vector by the magnetic sensor to obtain an attitude angle of the satellite relative to the earth; (6) judging whether the attitude angle is within the range of a third threshold value, if not, enabling the satellite to rotate by the momentum wheel, so that the attitude angle is adjusted to be within the range of the third threshold value; (7) obtaining an attitude quaternion of the satellite by a star sensor to determine 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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