• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.749-752
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• 2001

In this paper, the channel access algorithm for the AIS is analyzed and the design of the functional modules is presented. The function of RATDMA, ITDMA, FATDMA, and SOTDMA algorithm defined by ITU-R M.1371 specification is analyzed. Each TDMA algorithm is designed as a modularized function. In order to verify the function of designed channel access algorithm, the algorithm is implemented using C language and simulated on the PC environment. The simulation results show that the algorithm ran properly allocate a transmission slot and is satisfied with the requirements of the specification.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.478-480
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• 2005

The AIS(Automatic Identification System) transmits the position of ships and other information to prevent accidents which could occur in the sea. It has to be developed SOTDMA(Self-Organized Time Division Multiple Access) Algorithm which is important on wireless communication method for the AIS because It is based on ITU(International Telecommunication Union) M.1371-1 of the international standard therefore, we need to develop a performance evaluation simulator efficiently to develop and analyze SOTDMA Algorithm. This paper shows the method of designing it. Real ships access The VHF maritime mobile band but in this performance evaluation simulator several ship objects access the shared memory. Real ships are designed as the object and the wireless communication channel is designed as the shared memory. The ships apply for real virtual data which got from assistance hardware and The SOTDMA Algorithm driving state verifies the performance evaluation simulator by IEC(International Electrotechnical commission) 61993-2. After verifying results the performance evaluation simulator is correctly satisfied with IEC 61993-2. So we expect that it helps not only the AIS technology developed but also verify new SOTDMA Algorithm.