Fault-tolerant control method of cube star sensor

A fault-tolerant control and sensor technology, which is applied in attitude control, aircraft, and aerospace aircraft, etc., can solve problems such as failure, low attitude determination accuracy, and unguaranteed reliability, so as to improve reliability and attitude control. Accuracy, the effect of improving the attitude control accuracy of the CubeSat

Inactive Publication Date: 2017-12-26
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, due to the limited cost and volume of cube satellites in the world, the accuracy of attitude determination is generally relatively low, and the reliability cannot be guaranteed.
Once the sensor on the star fails, the entire satellite attitude control system cannot form a closed loop, the attitude control system will also fail, and the basic functions of the satellite will be limited or even fail.

Method used

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  • Fault-tolerant control method of cube star sensor

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Embodiment

[0023] combine figure 1 , a fault-tolerant control method for a cube star sensor, the sensor is a magnetometer.

[0024] Step 1. The magnetometer takes a reading, and after each reading, the mean value of the read data must be checked. The mean calibration formula is: M=(|X|+|Y|+|Z|) / 3. Among them, X, Y, and Z are the three-axis readings of the sensor respectively, and the M value is the criterion of whether it is within the normal reading range of the sensor.

[0025] Step 2, judge the value of M:

[0026] If the M value criterion is within the normal reading range of the sensor, that is, within 10-1000mGauss, the reading is correct and output directly. If it is not within the normal reading range, the last reading is output, and the error count T error +1.

[0027] Step 3, error count T error If it is greater than 3, switch another magnetometer and count the error T error set to zero if the error count T error Not greater than 3, and return to step 1.

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Abstract

The invention discloses a fault-tolerant control method for a cube star sensor. The method includes steps that the sensor starts reading and performs mean value verification on read data after each reading process; if an M value is within a sensor normal reading range, the reading is correct and direct output is performed; if the M value is not within the sensor normal reading range, the reading of the last process is output and an error count Terror is added with 1; if the error count Terror is greater than 3, the sensor is switched and zero setting is performed on the error count Terror; if the error count Terror is not greater than 3, the sensor performs reading continually and the above steps are repeated. According to the invention, after the sensor breaks down, real time monitoring and automatic switching are performed, so that satellite attitude determining reliability is improved substantially.

Description

technical field [0001] The invention belongs to the technical field of cube stars, in particular to a fault-tolerant control method of a cube star sensor. Background technique [0002] In recent years, with the rapid development of technologies such as communications, optoelectronic components, materials, sensors, and applied fluids, the development of CubeSat technology has accelerated significantly, and it has become possible to use CubeSats for remote measurement and testing. A large number of cubesats have been successfully launched, and more and more of them come from governments, enterprises, and especially academic institutions with strong scientific research capabilities. [0003] The attitude control subsystem is one of the most critical subsystems of the CubeSat. If some modules of the attitude control subsystem fail, or the attitude determination and control accuracy is low, the basic functions of the satellite will be limited or even lost. Especially for ground ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D1/08
CPCB64G1/244
Inventor 张晓华张翔胡远东陆正亮钱鹏俊于永军莫乾坤廖文和
Owner NANJING UNIV OF SCI & TECH
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