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Fault detection method based on correlation probability model

A probabilistic model and fault detection technology, applied in the field of abnormal detection of satellite telemetry data, can solve problems such as threshold selection troubles, and achieve the effect that is conducive to satellite health status monitoring and system maintenance

Active Publication Date: 2019-10-18
SHANGHAI ENG CENT FOR MICROSATELLITES
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Problems solved by technology

However, the telemetry parameters themselves are not sensitive to certain changes, and often face the problem of threshold selection when making abnormal judgments.

Method used

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  • Fault detection method based on correlation probability model
  • Fault detection method based on correlation probability model
  • Fault detection method based on correlation probability model

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Embodiment Construction

[0041] It should be noted that components in the various figures may be shown exaggerated for the purpose of illustration and are not necessarily true to scale. In the various figures, identical or functionally identical components are assigned the same reference symbols.

[0042] In the present invention, unless otherwise specified, "arranged on", "arranged on" and "arranged on" do not exclude the presence of intermediates between the two. In addition, "arranged on or above" only means the relative positional relationship between two parts, and under certain circumstances, such as after the product direction is reversed, it can also be converted to "arranged under or below", and vice versa Of course.

[0043] In the present invention, each embodiment is only intended to illustrate the solutions of the present invention, and should not be construed as limiting.

[0044] In the present invention, unless otherwise specified, the quantifiers "a" and "an" do not exclude the scen...

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Abstract

The invention relates to a fault detection method based on a correlation probability model. The method comprises the following steps: selecting a to-be-detected parameter from a plurality of telemetryparameters; dividing the to-be-detected parameters into a plurality of working units in time; determining a correlation coefficient between every two parameters in the plurality of telemetry parameters in each working unit so as to determine a correlation coefficient vector of the working unit; establishing a correlation probability model for the plurality of working units to determine multivariate probability distribution of the plurality of working units; carrying out dimension reduction on the multivariate probability distribution through principal component analysis (PCA) to obtain unaryprobability distribution; and performing anomaly detection on the data of the unary probability distribution to determine an abnormal to-be-detected parameter. According to the invention, parameter abnormity can be rapidly detected in the early stage of satellite faults, so that health state monitoring and system maintenance of satellites are facilitated.

Description

technical field [0001] The present invention generally relates to the field of abnormal detection of satellite telemetry data, and specifically relates to a fault detection method based on a correlation probability model. Background technique [0002] With the vigorous development of my country's aerospace industry, the number of satellites in research and development and already in orbit is increasing year by year, and modern satellites are developing from a single satellite to a satellite network. As a comprehensive system with high complexity, extensive technology and high cost, and due to the uncertainty of the space environment and the limitations of the pre-launch test, some abnormalities or Faults, telemetry parameters are an important basis to reflect the health status of satellites. [0003] At present, the method of setting thresholds is widely used in China for satellite anomaly detection. This method is simple and effective, has a low false detection rate, and ...

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Application Information

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IPC IPC(8): G06F17/50G06K9/62
CPCG06F30/20G06F18/2135
Inventor 孙宇豪张鸽李国通
Owner SHANGHAI ENG CENT FOR MICROSATELLITES
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