Train speed estimation device and method based on vibration signals

A train car having a train speed estimation device, the train car comprising:

• a carriage;
• a bogie attached to the carriage;
• a first wheel is provided on the bogie;
• a second wheel is provided on the bogie;
• at least one sensor pair, comprising a first sensor, located at an axle center of the first wheel, and a second sensor located at an axle center of the second wheel, the first sensor and the second sensor being arranged in the direction of advance of a train, the first sensor and the second sensor being configured to measure, at the same sampling frequency, natural harmonic vibrational frequencies experienced by the train as it advances, in order to obtain a first set of sampling signals and a second set of sampling signals respectively;
• a processor, configured to obtain a first set of vibration signals and a second set of vibration signals based on the first set of sampling signals and the second set of sampling signals respectively, the processor being configured to filter the first set of vibration signals and the second set of vibrations signals and subject the first set of vibration signals and the second set of vibration signals to cross-correlation analysis, to obtain a target sampling difference;
• the target sampling difference obtains a maximum cross-correlation between the first set of vibration signals and the second set of vibration signals, and the processor is configured to calculate a train speed based on the target sampling difference without relying on any speed sensor or global navigation satellite system;
• wherein the processor is further configured to obtain a characteristic frequency band of the first set of sampling signals and the second set of sampling signals having an amplitude higher than a threshold in a low-frequency range, and filter the first set of sampling signals and the second set of sampling signals in the characteristic frequency band, in order to obtain the first set of vibration signals and the second set of vibration signals;
• wherein before the first sensor and the second sensor perform the sampling, the first sensor is further configured to send p standard initial pulses, where p is a natural number greater than or equal to 1, and the second sensor is further configured to send a feedback initial pulse whenever it receives the standard initial pulses;
• if the first sensor receives the feedback initial pulse, then the first sensor is further configured to send a standard synchronization pulse and begin the sampling;
• if the second sensor receives the standard synchronization pulse, then the second sensor is further configured to begin the sampling and send a feedback synchronization pulse;
• and
• if the first sensor receives the feedback synchronization pulse, then the first sensor is further configured to continue the sampling;
• and
• wherein if the first sensor does not receive the feedback synchronization pulse, then the first sensor is further configured to stop the sampling, and return to the step of sending the standard initial pulses;
• and if the second sensor receives the standard synchronization pulse again, then the second sensor is further configured to stop the sampling, and then return to the step of beginning the sampling and sending the feedback synchronization pulse.