Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proposed Efficient Design for Unmanned Surface Vehicles   Recently worldwide interest is growing toward commercial, military or
scientific Unmanned Surface Vehicle (USV) and hence there is required to
develop their guidance, navigation, and control (GNC) systems. Real USVs are a
relatively new advent, so the drawbacks of each model will be modified during
the time. The proposition of an environmentally friendly as well as high
efficient USV's design are the main purposes of this paper to guide future
researches. Power management between renewable sources and storage units is
considered. Furthermore, suitable and modern sensors are applied for state
estimation and environmental perception. Technical requirements relate to
guidance and control methods are provided to achieve the highest performance in
the environment. Also, the hull structure and its material are important
factors that are considered in this paper.

18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an