IEEE - Aerospace and Electronic Systems - April 2023 - 36

Neural Network-Based Controller for Terminal Guidance Applied in Short-Range Rockets
Figure 7.
Neural network scheme.
Table 4.
Neural Network Quality Parameters Results After Training (1)
Strategy 1
Set
Train
Test
Alg.
MSE
SCG 3.35E-03
Validation SCG 3.36E-03
SCG 3.29E-03
BR
Train
Validation BR
Test
Train
BR
Reg.
MSE
9.19E-05
9.34E-05
9.34E-05
LM 1.01E-04
Validation LM 1.05E-04
Test
LM 1.26E-04
9.31E-02 2.87E-03
1.08E-01 3.01E-03
1.05E-01 2.88E-03
9.19E-01
9.85E-01
9.85E-01
9.84E-01 1.04E-04
9.89E-01 1.37E-04
9.94E-01 1.36E-04
Strategy 2
Strategy 3
Reg.
MSE Reg.
1.12E-04
6.54E-05
6.54E-05
5.53E-01 3.09E-03 3.29E-01
3.37E-01 3.08E-03 3.15E-01
4.97E-01 3.21E-03 2.11E-01
9.83E-01 9.68E-05 9.85E-01
9.99E-01 7.35E-05 9.89E-01
9.99E-01 7.35E-05 9.89E-01
9.85E-01 2.01E-04 9.77E-01
9.57E-01 2.54E-04 9.99E-01
9.79E-01 2.47E04 9.87E-01
linear law. The larger the initial canard deflection, the
more away the target is. This estimate was used to maintain
the rocket's original launch angle.
IMPLEMENTATION
A suggestion for the implementation ofthese proposed algorithms
based on NNs is to use the MATLAB-Simulink
coder itself, which provides the advantage of having versatility
and flexibility in the prototyping stage. The time step
has been set to 1 ms, which is significantly longer than the
characteristic time of a conventional on-board processor.
This fact could ensure the viability for real-time operation.
36
NUMERICAL RESULTS
The numerical results for the training process are shown
first. The MSE and the regression parameter are summarized
in Table 4. The " set " of data is defined in the first
column, i.e., train (70%), validation (15% ), or test (15% )
data. The applied training algorithm is displayed in the
IEEE A&E SYSTEMS MAGAZINE
APRIL 2023
However, this topic is outside the scope proposed for this
article and, ofcourse, for implementation in a serial production
environment, a much more detailed study of the implementation
method would have to be carried out.

IEEE - Aerospace and Electronic Systems - April 2023

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