Satellite control system fault diagnosis method based on multiple layer state estimators

Abstract

The present invention relates to a satellite control system fault diagnosis method based on multiple layer state estimators. With the method, fault isolation of an optical sensor and an inertial sensor can be achieved under the circumstance that hardware redundancy conditions are not met. The method comprises the following basic process: firstly establishing a analytical model for describing an output relationship between the optical sensor and the inertial sensor; secondly respectively designing two layers of state estimators based on the model, wherein residual error generated by the first layer state estimator is sensitive to the optical sensor fault and the inertial sensor fault, and residual error generated by the second layer state estimator is not affected by the inertial sensor fault; finally detecting the residual error generated by the first layer state estimator, and comparing with the preset threshold value to determine whether the fault occurs, wherein the optical sensor fault and the inertial sensor fault can be distinguished based on the residual error generated by the second layer state estimator if the fault occurs.

Description

technical field [0001] The invention belongs to the field of satellite attitude control and relates to a fault diagnosis method for a satellite control system based on a multi-layer state estimator. Background technique [0002] Most modern spacecraft have complex structures, harsh working environments, long operating hours, and are prone to failures during on-orbit work. Once a failure occurs, if active and effective measures are not taken to deal with it, it is likely to lead to the failure of space missions, resulting in huge waste of resources and adverse social impact. [0003] As the most critical and complex subsystem among the various subsystems that make up the satellite, the reliability of the satellite attitude control system is the basic guarantee for the normal operation of multiple subsystems on the satellite. For example, the telemetry and remote control subsystem requires the antenna to point to the correct position in order to realize communication with the...

AI Technical Summary

Problems solved by technology

Generally, the method of consistency check is used for fault diagnosis of satellite attitude sensors, such as fault detection by comparing the output of two optical sensors, but when the hardware redundancy conditions are not satisfied (such as the number of non-faulty optical sensors is less than 2), this method cannot be used for fault diagnosis

In order to solve the problem of fault diagnosis of satellite attitude sensors when the hardware redundancy condition is not satisfied, the present invention proposes a fault diagnosis method for optical sensors and inertial sensors based on multi-layer state estimators

Images