Aerospace and Electronic Systems Magazine April 2017 - 39

Nassar, Hussein, and Medhat
pretation of the process (describe and identify which variables are
responsible for the faults and why).

CONCLUSION

[7]

[8]

The innovation of this work comes from proposing a novel supervised PLS-DA classifier algorithm to monitor and detect anomaly
of the spacecraft operations status via practical application on
ADCS. The algorithm based on the multivariate projection technique is applied to spacecraft telemetry data in order to manage the
nominal and off-nominal status of the spacecraft operations and to
overcome faulty states in the space mission operation. The algorithm exploits telemetry data for model building and validating.
The analysis results show that the algorithm has the capability to
create data clusters, compare the characteristics of each one, and
the capability to correlate the clusters with low cardinalities to their
corresponding trigger events. Furthermore, the analysis results
were compared with both the SIMCA-P software and the nonlinear
SVMs algorithm, as well as the results show an evident agreement
regarding results accuracy.
Based on the above analysis and discussion in this study, it is
presumed that the novel PLS-DA algorithm proves that it can be
used as an effective tool for monitoring ADCS SOH because it gives
information about the system outputs as well as adding more insight
into physical explanations and interpretation of the process which
overcome the black-box problem of SVMs and ANNs techniques.
In addition, the performance of the PLS-DA algorithm needs to be
adopted and evolved by extending the work to be implemented for
more faulty states and in addition to be applied for monitoring two
or more subsystems. These and other problems in this research field
need to be further studied, with the aim of qualitatively analyzing
the efficiency and reliability of the classifiers algorithms.

[9]

[10]

[11]

[12]

[13]

[14]
[15]

[16]

[17]

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