说明：  非常详细的AIS信号解析过程，介绍了AIS报文的各个部分的含义，以及报文种类，以及报文参数的解码方法和过程，并添加了举例说明。
(The process of AIS signal analysis is very detailed. The meaning of each part of AIS message, the type of message, the decoding method and process of message parameters are introduced, and an example is added.)