On-board synchronization device and smart machine

A smart machine, comprising:

• at least one on-board device;
• a satellite positioning device;
• and
• an on-board synchronization device, comprising a first circuit and at least one second circuit, wherein
• the first circuit is configured to receive an initial signal containing Universal Time Coordinated (UTC), generate a first signal containing the UTC, and output the first signal to at least one on-board device, such that the at least one on-board device synchronizes its built-in clock with the UTC based on the first signal, and
• the second circuit is configured to receive a Pulse Per Second (PPS) signal, generate a periodic second signal with a same phase as the PPS signal, and output the second signal or the PPS signal to the at least one on-board device, such that the at least one on-board device performs a predetermined action based on the second signal or the PPS signal,
• wherein the second circuit comprises a second signal generating and processing module, and a pulse signal one-out-of-two selection module,
• wherein the second signal generating and processing module is configured to generate a second signal based on the PPS signal, generate a signal source switching control signal, and output the second signal and the signal source switching control signal to the pulse signal one-out-of-two selection module, and
• wherein the pulse signal one-out-of-two selection module is configured to output the PPS signal or the second signal in accordance with the signal source switching control signal.