Development of a local automatic identification system (AIS)

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ID: 286026
2022
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Abstract
Automatic Identification System (AIS) is a device that transmits vessel data about speed, course, heading, location, and other important ship information. This device has been around for two decades, and the market for it is still growing. Philippines is a known maritime nation, and its archipelagic nature shows that shipping is the most cost-effective mode of transportation, and serves as the backbone of domestic trade in the country. This results to an increasing maritime traffic and vessels which makes safety and security in the sea a significant matter.Unfortunately, AIS is still not widely adopted in the Philippines and maritime accidents are still happening and increasing. In addition to that, data for monitoring these AIS-installed vessels is not enough with only 33 AIS receivers around the Philippines and 18 of it are only available 50% most of the time. This results to the lack of systematic data which can be used in analyzing accidents and for other purposes. This thesis aims to develop a Class A AIS that will be locally available and promote the use of AIS in the Philippines.The AIS is developed by using a development board that will eliminate the need for hardware design and fabrication. However, the software components still need to be developed and must be in line with the ITU recommendation for Class A AIS. The development board contains a microcontroller and AIS data processor that communicates with each other to receive and transmit messages. All of the reception and transmission done by the microcontroller must be stored in the frame map that implements the TDMA scheme defined in the ITU recommendation. A frame is equivalent to one minute that is synchronized to the UTC second, and the frame contains 2250 slots where each slot could be allocated for transmissions. The UTC synchronization is done by using a GPS module that is included in the development board. The transmission decision and schedule of AIS is autonomously done by the SOTDMA algorithm which depends on the ship speed, ship heading, and especially frame map. The AIS must not transmit in allocated slots to prevent transmit collisions, and for high reliability of the system. However, the development board still lack the data interface to receive data from sensor like heading information so this was also developed. In addition to that, a power amplifier is also designed, and fabricated to provide the required 12.5 W of transmit power
Reference Key
persistent_1760657352_68f17fc8c2dcf Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lorenzo Jr., Jomel A.
Journal Malay Journal
Year 2022
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etdm_ece/9
Keywords Keywords not found

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