Satellite-borne turntable fault detection method based on multi-mode threshold optimization

Abstract

The invention relates to a satellite-borne turntable fault detection method based on multi-mode threshold optimization. The method comprises the following steps: constructing a multi-mode threshold optimization framework based on evidence reasoning; determining an initial interval reference value of each key parameter under the multi-mode threshold optimization framework; performing interval reference value evidence reasoning-based multi-mode threshold iterative optimization according to the initial interval reference value of each key parameter to generate an optimized threshold; and on-line fault detection of the satellite-borne turntable is carried out based on the optimization threshold value. According to the method, the evidence reasoning algorithm is creatively utilized to fuse the multi-mode threshold value and the monitoring data, the multi-mode threshold value is optimized, on-orbit fault detection of the satellite-borne rotary table is achieved, and the problems that the multi-mode initial threshold value is unreasonably set before orbit injection, and the fault detection rate is low due to the fact that the initial threshold value and the on-orbit operation state are greatly different are solved. According to the method, expert knowledge can be fully fused, the on-orbit fault detection capability of the satellite-borne turntable is improved, and the method has good engineering application value.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a fault detection method for a spaceborne turntable based on multi-mode threshold optimization. Background technique [0002] At present, with the rapid development of science and technology, countries have accelerated the pace of exploration of outer space, and large spacecraft such as launch vehicles, space shuttles, manned spacecraft, and artificial satellites continue to emerge. Among them, remote sensing and various space exploration satellites, as an important means for human beings to explore space and the earth, account for an increasing proportion of the artificial satellites launched by various countries. As an important type of payload on satellites, space-borne turntables play an important role in satellite on-orbit detection and space communication tasks. However, during the on-orbit operation of the space-borne turntable, due to the change of the space environ...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, there are still three problems with this method: (1) The initial alarm threshold is generally determined by the satellite research and development department according to the design indicators of the components, and the set initial threshold range is relatively conservative, which is not conducive to the detection of alarms within the threshold range. The trend of slow-changing faults tends to cause missed fault reports, which can easily cause further deterioration of the fault and develop into a serious fault; (2) The setting of the threshold interval is often different from the actual on-orbit operating status of the component, which makes the performance of the component degraded. , the adaptability of the initial threshold becomes worse

(3) When some parameter values ​​of the satellite change due to reasons such as switching of working modes and changes in the operating environment, the alarm threshold cannot be set accurately, and a fixed threshold cannot cover all changes in working conditions, which may easily cause major failures False alarm rate or false negative rate

When the above existing threshold optimization methods are applied to the fault detection of space-borne turntables, due to the unreasonable setting of the multi-mode initial threshold before orbiting, it often causes problems such as low fault detection rate due to the large difference between the initial threshold and the on-orbit operating state

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