摘要
基于北斗短报文转发AIS信息可以解决其远海域存在监控盲区的问题,然而船舶密集海域的AIS信息经过筛选过滤后数据量依然较大,转发需要大量的时间,不满足船舶动态监控的时效性要求。针对此局限性研究AIS信息的压缩编码技术,先对AIS信息作预处理去除无效冗余,再应用差分编码压缩AIS船位信息,将处理后的AIS参数按新规则重组后通过北斗转发。实验结果表明经过预处理和差分编码技术处理过的AIS信息量缩减一倍,误码率极低,船舶位置误差在2米以内。
Transmission of AIS information can solve the problems of blind area of long-range ocean based on short message from Beidou navigation satellite system. However AIS information in areas of densely ships by self-adaption filtered also can not be transmitted through Beidou channel, it is too much time for transmission to meet the timeliness of ship dynamic monitoring. To solve this limitation, it is necessary to study on AIS information compression coding technologies. Firstly, preprocess AIS information to remove ineffective redundancy, then compress AIS ship position information by differential encoding. AIS parameters reorganization according to new rules are transmitted by Beidou. The results show that preprocessing and differential encoding technologies reduce a half of the amount of information with low error rate, the ship＇s position error less than 2 meters.
出处
《船电技术》
2016年第9期40-43,共4页
Marine Electric & Electronic Engineering
关键词
AIS信息
北斗短报文
预处理
差分编码
automatic identification system information
Beidou short message
preprocessing
differentialencoding
