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Online intelligent diagnosis method for satellite angular velocity abnormal fault under condition of no gyroscope

An intelligent diagnosis and angular velocity technology, which is applied in linear/angular velocity measurement, angle measurement, velocity/acceleration/shock measurement, etc., can solve problems such as abnormal satellite angular velocity faults and high noise, and achieve maximum excavation, improve accuracy, The effect of a solid data foundation

Active Publication Date: 2021-10-01
BEIJING INST OF CONTROL ENG
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  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to propose an online intelligent diagnosis method for abnormal satellite angular velocity faults without a gyroscope, to overcome the problem of large noise and large errors caused by differential calculation of angular velocity, and to improve the efficiency of online diagnosis Accuracy

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  • Online intelligent diagnosis method for satellite angular velocity abnormal fault under condition of no gyroscope
  • Online intelligent diagnosis method for satellite angular velocity abnormal fault under condition of no gyroscope
  • Online intelligent diagnosis method for satellite angular velocity abnormal fault under condition of no gyroscope

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Embodiment

[0141] Taking a satellite with a flywheel+chemical thruster as an example as an example, the specific implementation of the present invention is introduced. Take the scroll axis as an example to illustrate. Assume that the satellite rolling axis inertia is 5000kg m 2 In the normal working mode, the flywheel is used to perform attitude control tasks (the maximum torque of the flywheel is 0.1Nm), and the jet thruster is used to perform maneuver tasks during attitude maneuvers (the maximum control torque generated is 40Nm), the maximum target angular velocity is 0.5° / s, and non-attitude maneuvers The maximum angular velocity index during this period is 0.005° / s, and the sampling period Δt=0.1s.

[0142] (1) Design a tracking differentiator to filter the attitude angle measurement

[0143] At initialization, the recursive variable x is set to 0. The values ​​of related design parameters are as follows: speed factor r=5, time parameter h 0 = 1 (i.e. 10Δt), h 1 = 1.3.

[0144]...

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Abstract

The invention relates to an online intelligent diagnosis method for a satellite angular velocity abnormal fault under the condition of no gyroscope, which belongs to the field of spacecraft fault diagnosis. The method comprises the following steps of 1, setting a sampling period as deltat, recording a time sequence as t1, t2,... tk,..., and setting a current moment as tk, 2, measuring an attitude angle theta(k) at the current moment, and calculating an attitude angle filtering value at the current moment, 3, calculating an angular velocity estimation value and an angular acceleration estimation value at the current moment, 4, calculating an angular velocity deviation EW, 5, distinguishing according to whether the current satellite is in the attitude maneuver process or not, and 6, setting an abnormal probability threshold value PY of the angular velocity, comparing P1 and P2 with PY respectively, and judging whether the angular velocity is normal or not. The method overcomes the defects that noise is large due to differential angular velocity calculation, and the misjudgment rate is high due to the fact that the angular velocity judgment threshold value is fixed and cannot be automatically adjusted on line, and also avoids the difficulty and risk that the threshold value can only be manually modified through a remote control instruction.

Description

technical field [0001] The invention belongs to the field of space vehicle fault diagnosis, and relates to an online intelligent diagnosis method for abnormal satellite angular velocity faults without a gyroscope. Background technique [0002] If the angular velocity is abnormal when the satellite is in orbit, it usually indicates a serious failure. If it cannot be diagnosed quickly, it will lead to catastrophic consequences such as loss of control and even disintegration of the satellite. Usually, the angular velocity information of a star can be provided by a gyroscope. In this case, it is usually not difficult to determine whether the actual angular velocity of the satellite is abnormal by comprehensively judging the angular velocity information. However, if the gyroscope fails to provide angular velocity information of one or more axes, the difficulty of diagnosing abnormal satellite angular velocity will be greatly increased. Contents of the invention [0003] The ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/00G01C1/00
CPCG01P3/00G01C1/00
Inventor 刘磊王佐伟贾蒙杨何刚王祥甘永李建平张玉洁张树华冯佳佳李洋吴雪峰
Owner BEIJING INST OF CONTROL ENG
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