Micromechanical in-orbit gyroscope fault detection method and device

Abstract

The invention discloses a micromechanical in-orbit gyroscope fault detection method and device, and the method comprises the steps: constructing an EKF according to a satellite state equation and a system measurement scheme, and obtaining the gyroscope constant drift under a satellite body system according to the EKF; the gyro constant drift under the satellite body system is converted into gyro constant drift under a gyro coordinate system through coordinate conversion; when the odd-even detection system constructed by the gyroscope detects that a fault occurs, compensating an odd-even vector in the odd-even detection system by using gyroscope constant drift under a gyroscope coordinate system; and constructing a judgment function for detecting a noise fault by using the compensated odd-even vector, and carrying out fault detection according to the judgment function. According to the fault judgment method and device, the problem of inaccurate judgment caused by an existing fault judgment method is solved, and the accuracy of fault judgment is improved to a certain extent.

Description

technical field [0001] The present application relates to the field of satellites, and in particular, to a method and device for fault detection of a micromachined on-orbit gyroscope. Background technique [0002] Commercial shelf-level Micro Electro Mechanical systems (MEMS) gyroscopes have the advantages of small size, light weight and low cost, and are being used more and more widely in inertial measurement systems for microsatellites. However, as the core sensor of the satellite attitude and orbit control system, the failure rate of the gyroscope accounts for 17% of the whole system failure. Usually, the fault of satellite gyroscope is mainly manifested as abnormal constant drift. However, in-orbit MEMS gyroscopes are often subjected to external disturbances such as space irradiation, electromagnetic environment, and satellite circuits, resulting in sudden and abnormal random noise errors, and it is difficult to simulate and reproduce on the ground. [0003] Commonly u...

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Problems solved by technology

[0024] This application provides a micromechanical on-orbit gyroscope fault detection method to solve the problem of inaccurate judgment caused by the existing fault judgment method

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