Method for decoding and analyzing messages of urban rail CBTC (Communication Based Train Control) signal system

The invention provides an urban rail CBTC (Communication Based Train Control) signal system message decoding analysis method, which specifically comprises the following steps of: acquiring a communication protocol type of each urban rail CBTC signal system, and compiling a configuration file corresponding to the communication protocol type of each urban rail CBTC signal system; determining an urban rail CBTC signal system which carries out message analysis, and calling corresponding message data; calling a corresponding configuration file according to the communication protocol type of the urban rail CBTC signal system, formulating an analysis rule according to the configuration file, performing message analysis on the obtained message data according to the formulated analysis rule, and extracting a message field; and setting a screening condition, screening the extracted message fields, determining a target message field, carrying out comparative analysis on the target message field, and carrying out visual