Secure Marine Communication Under Distributed Slotted MAC

The automatic identification system is used by the ships, and the VHF data link (VDL) mode 4 system is used by the avionics industry. Based on ground infrastructure, the traditional surveillance applications for ships are built with radar support. The major drawback of radar is the inability to see behind large obstacles. This obstacle affects the attenuation signal at receiving ship. Therefore, we present an obstacle-based radio propagation model that considers the effect caused by the presence of obstructing ships in line of sight. This model is evaluated in terms of throughput, collision, and packet transmission under distributed slotted MAC.