Aerospace and Electronic Systems Magazine April 2017 - 36

Supervised Learning Algorithms for Spacecraft Attitude Determination and Control System Health Monitoring
In other words, these variables are directly correlated with the
faulty states while the pitch angle (Theta) is inversely correlated
with them, but it has a critical effect and we use a contribution bar
plot to explain the phenomena. Finally, assessment between both
models results shows remarkable agreement.

Subsequently, the model developed from training set (Set-1)
is tested and validated with new observations not included in the
original training set. Hence, the PLS-DA model for validation is
developed using a testing/prediction set (Set-T) of 270 observations (239 nominal, 31 faulty). The PLS-DA score values for the

Table 2.

SVMs Generalization Performance for ADCS Status
% Testing Efficiency

Kernel
Function

Kernel Parameters

Poly

Gaussian

Train Set-1 Test Set-T

Train Set-2 Test Set-T

n = 10.0, C = 1000

96.13

93.36

n = 10.0, C = 500

94.71

92.81

n = 8.0, C = 1000

95.4

92.76

n = 8.0, C = 500

93.8

91.31

 = 0.2, C = 1000

95.92

92.89

 = 0.2, C = 500

95.47

92.52

 = 0.1, C = 1000

96.98

94.29

 = 0.1, C = 500

94.8

91.77

Figure 9.

PLS-DA algorithm score and loading plots using the training data set
(Set-1).

Figure 10.

SIMCA-P score and loading plots using the training data set (Set-1).

36

IEEE A&E SYSTEMS MAGAZINE

APRIL 2017



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