Based on the modernization of GMDSS, the characteristics of maritime digital broadcasting (NAVDAT) system and its performance requirements for antenna are analyzed, and a scheme of Medium Frequency broadband antenna for NAVDAT is proposed. The simulation results show that the antenna designed in this scheme has high bandwidth, and the input impedance of the antenna presents narrow band and changes smoothly, it can well meet the broadband communication requirements of NAVDAT.
Container shipping networks play a vital role in global trade. Using AIS data, this paper analyzes the evolution and characteristics of China's foreign trade container route network in recent years. The study found that, from 2016 to 2019, the scope of China’s international liner shipping network was expanded. The number of nodes increased from 468 to 622, and the efficiency of the network has increased by 7.8%. In the meantime, the importance of ports in the network has changed, as Busan replaced Singapore as the highest connectivity node of China's container shipping network. Finally, this paper gives suggestions to improve the connectivity and hub degree of China's container route network.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.