说明：  AIS解码在数据处理程序中, 首先必须将接收的字符转换成ASC II码, 再调用校验程序, 对接收到的数据进行校验, 当校验正确后, 才能进行编码转换
(AIS decoding data handler, you must first convert the received characters into ASC II code, and then call the calibration procedure, the received data checksum checksum is correct to encode conversion)