Time synchronization method, device, electronic device, storage medium and vehicle

Abstract

The embodiment of the invention discloses a time synchronization method, device, electronic equipment, storage medium and vehicle, and relates to the field of automatic driving. This embodiment includes: obtaining the first clock source signal and the second clock source signal in real time, the first clock source is a satellite signal, and the second clock source is the time synchronization signal of the roadside unit; when only the first clock source signal is obtained , use the first clock source signal as the global clock source; when only the second clock source signal is obtained, use the second clock source signal as the global clock source; when the first clock source signal and the second clock source signal are obtained at the same time , using the clock source with higher precision among the first clock source and the second clock source as the global clock source; based on the global clock source, the local time of the vehicle-mounted unit is synchronized. This embodiment provides dual clock sources, and the redundancy of the clock sources ensures that the vehicle end can obtain stable and accurate timing in harsh environments, and ensures the feasibility and low cost of vehicle-road coordination.

Description

technical field [0001] The present application relates to the technical field of automatic driving, and in particular to a time synchronization method, device, electronic equipment, storage medium and vehicle. Background technique [0002] With the rapid development of autonomous driving and intelligent transportation technology, vehicle-road coordination is an advanced development form of intelligent transportation system and an important application of Internet of Things technology in the field of transportation. The beginning of all vehicle-road coordination technologies is inseparable from the time synchronization between the control units, that is, the time synchronization between the vehicle control unit, the roadside unit or the cloud needs to be synchronized. At present, the PPS signal of the GNSS module is often used to perform time service to the vehicle control unit and the roadside unit, or to use a high-precision crystal clock source for time service. However, ...

AI Technical Summary

Problems solved by technology

However, GNSS modules have higher requirements on the environment. For example, when there is large interference in urban areas, there is no GPS signal in tunnels and overpasses, or poor weather affects GPS signals, the GNSS module cannot output stable and accurate PPS signals, which cannot be sustained. timing

The cost of high-precision crystal clock source is high, it is not suitable for batch products, and it is easy to be affected by temperature and cause cumulative error

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