Urban rail train speed and distance measurement redundancy protection method

The invention discloses an urban rail train speed measurement and distance measurement redundancy protection method, which comprises the following steps of: analyzing a speed measurement and distance measurement redundancy protection scene and a protection scheme of an urban rail train, determining key data and data volume which need to be communicated between speed measurement and distance measurement processors at the head end and the tail end of the train; the method comprises the following steps: analyzing constraint conditions of CAN bus communication between the train head and tail speed measurement and distance measurement processors, determining a Baud rate of CAN bus communication between the train head and tail speed measurement and distance measurement processors, analyzing output data difference and data transmission time consumption of the train head and tail speed measurement and distance measurement processors according to the Baud rate of CAN bus communication, and determining the train head a