在matlab环境中利用串口接收GNSS信号，按照NEMA-0183格式规定，对主要的NEMA语句进行解析，将文字的位置、速度、卫星定位信息等替换为可用的double数字形式。-Using the serial port to receive the GNSS signal in the MATLAB environment, in accordance with the provisions of the NEMA-0183 format, parses NEMA main text, position, speed, satellite positioning information to replace the double available in digital form.