星载 AIS 消息碰撞的 MATLAB 仿真

摘要

Automatic Identification System(AIS) satellite constellation is able to monitor ships all around the world through receiving AIS message,but its performance is affected by message collision. This paper analyzes the message collision of AIS by simulating maritime AIS communication with MATLAB software. The result shows that under different requirements and conditions,there always exists optimal antenna coverage of space-borne AIS receiver. The simulation and analysis provide reference for microsatellite design.%通过接收船舶自识别系统(AIS)广播消息,AIS 卫星星座能够实现覆盖全球的船舶监视,但广播消息的时域碰撞将极大影响其性能指标。使用 MATLAB 模拟海上船只状态,对船舶自识别系统通信协议进行高度还原,研究星载 AIS 消息碰撞情况。仿真结果表明,在不同任务、不同条件下,星载 AIS 接收机天线均存在最优覆盖范围。仿真分析结果可为 AIS 微小卫星设计提供参考。