A Microsecond Time Calibration Method for Swimming Timing Equipment Based on CAN Bus

Abstract

The present invention relates to the technical field of racing competition equipment, specifically a microsecond-level time calibration method for swimming timing equipment based on CAN bus, S1, device power-on initialization clock reference; S2, time calibration operation; S3, automatic calculation and results exhibit. The present invention is based on the microsecond-level timing method of CAN bus swimming timing equipment. In the same CAN network, a high-precision clock source can perform microsecond-level timing calibration for multiple timing equipment, and there is no limit on the number. This method can Provide a more accurate and stable timing reference for the swimming timing system. It can synchronize the clocks of multiple devices at the microsecond level. There is no limit to the number of synchronized devices in the same network. The clock reference of each device can be dynamically compensated without adding additional With the investment in hardware, the complexity of the system is significantly reduced, the portability of the timing system is improved, the stability of the system is improved, and the timing results are more accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of racing equipment, in particular to a microsecond-level time calibration method for swimming timing equipment based on a CAN bus. Background technique [0002] The current timing method of the computer operating system is to calculate the total number of seconds from 1970 / 01 / 01, but the computer hardware is mainly based on the internal time of the BIOS, due to the frequency problem of each chip itself and the error caused by the drift of the crystal oscillator. There is a difference between the above two times, and the time deviation will become larger and larger due to the long-term operation of the equipment. The swimming timing system needs to accurately record the moment when the athlete touches the wall. In order to avoid timing differences, it is very important to correct the timing of the timing hardware. Swimming The timing system needs to deploy a timing terminal on each lane for separate timing t...

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Problems solved by technology

[0003] However, the timing terminal is affected by temperature or other factors, and long-term operation will cause the internal crystal oscillator to drift, and frequency errors will occur. If there is no unified time reference for the timing terminal to perform time calibration operations, multiple timing terminals are inevitable in long-term competitions. There will be running errors, resulting in inaccurate timing. Therefore, it is necessary to design a mechanism that can perform time calibration operations on timing terminals through the communication bus, and ensure the uniformity of time references of multiple timing terminals during long-term operation.

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