基于模糊函数的AIS信号码元序列估计算法研究

摘要

针对获取船舶状态信息的需求,研究了AIS信号码元序列估计技术,提出了一种新的AIS信号码元序列估计算法.利用AIS信号的先验信息构造了AIS样本信号,采用雷达信号处理中模糊函数的思想,获得AIS信号的起始时刻、频偏、幅度等参数进行有效估计,进而估计出AIS信号的码元序列.该方法不需要对AIS信号进行解调.算法的有效性通过对实际接收到的AIS信号数据进行处理得到了验证.%Aiming at meeting the requirements of getting the original information of ships,symbol sequence estimation of AIS signals were researched,a new algorithm is presented for symbol sequence estimation.The proposed algorithm make use of the prior information of AIS signal,adopts the theories of ambiguous function,which can estimate start-time、frequency deviation and amplitude of AIS signal,then can estimate symbol sequence of AIS signal without demodulation.At last,a experiment of AIS signal which receive by antennas symbol sequence estimation is made.The test results demonstrate that the proposed algorithm is valid.