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AIS基站短消息特性

, PP. 111-118

Keywords: 海事通讯,自动识别系统,半实物仿真,Hata-Okumura模型,误包率,场强计算,极限容量

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Abstract:

研究了在内河与港口应用环境下,由船载自动识别系统(AIS)基站发送到船舶的短消息特征,分析了AIS报文在场强下降后的波形失真与误包原理。在半实物仿真平台下,分析了消息长度与误包率的关系,并给出相应的误包率预测模型。结合Hata-Okumura模型,提出了拥挤航道下AIS基站向船舶发送短消息的极限容量。最后以黄浦江上海航道为例,运用极限计算模型对其极限容量进行了预测,并与实测结果进行了对比。对比结果表明短消息可靠性随长度增加与场强降低而逐步下降,基站能同时进行短消息管理的AIS船舶数量有限,对于本文设定的黄浦江上海航道,当AIS目标船舶数量达到625艘时,AIS基站能同时进行短消息通讯的AIS船舶容量的计算结果为26艘,实测为24艘,计算结果与实测结果基本一致。

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