Aerospace and Electronic Systems Magazine July 2018 - 39

Cheng et al.

Figure 6.

Pitch antenna radiation pattern. (a) Pitch angle of 0°. (b) Pitch angle of 15°. (c) Pitch angle of 25°.
Azimuth antenna radiation pattern. (d) Azimuth angle of 0°. (e) Azimuth angle of 15°. (f) Azimuth angle
of 25°.

is shown in Figure 7. Unlike the classical neural network, in a CNN, the
layers are arranged into three dimensions: width, height, and depth [19].
In CNN, the depth refers not to the
full neural network depth but to the
third dimension of an activation volume. The depth of CNN consists of
a rolling layer and a downsampling
layer.
According to the filter learning
performance, the convolution layer
can be used to filter a specific feature. At the same time, the feature of
a lower layer is kept invariant; thus,
the robustness of feature expression
is enhanced. In addition, the extraction mechanism is forwarded from
lower layers to higher layers to ensure
that high-level layers are learned the
mechanism and obtain the ability to
contribute the subsequent detection
and identification of tasks.
The main limitation of the CNN
extraction process is the slow speed
of feature extraction. The CNN feature extraction process contains a
large number of floating-point multiplications; thus, it is time consuming
[20]. To alleviate the problem and to
accelerate the feature extraction, two
valued neural networks are used in
this article. Therefore, multiplication,
addition, and other arithmetic operations are converted to bit operations,
which enhances the speed of network
operations greatly.

Figure 7.

Architecture of the deep CNN.

JULY 2018

IEEE A&E SYSTEMS MAGAZINE

39



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