Synchronous accumulated error suppression method based on the crystal offset compensation for mechanical vibration wireless sensor networks#br#

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 132-136.

XIAN Hong-yu, DENG Lei, TANG Bao-ping, XIAO Xin

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Abstract

Aiming at the synchronous accumulated error at the nodes of mechanical vibration wireless sensor networks which adopt continuous high frequency sampling clock analog-to-digital converter (ADC), a synchronous accumulated error suppression method based on crystal offset compensation was proposed. The reason of synchronous accumulated error was analyzed. The start of frame delimiter (SFD) signal in the periodic beacon was used as the synchronization information. First, the compensation value of the crystal oscillator offset was determined according to the difference between the SFD signal interval captured by the timer 1 and the reference SFD signal interval. Then, according to the relationship between the sampling clock and the sampling frequency, the count overflow value after the compensation of the timer 2 was calculated. Finally, a continuously accurate high-frequency sampling clock was output by the timer 2, which eliminates the difference of sampling intervals between nodes and suppresses the synchronous accumulated error. The experimental results show that the maximum synchronization error between nodes when is 0.64 μs in 40 s continuous acquisition and there is no significant phase error between nodes when sampling the same signal source in 25 s continuous acquisition. The results indicate that the method based on crystal offset compensation can suppress effectively the synchronous accumulated error of the mechanical vibration wireless sensor networks.

Key words

mechanical vibration monitoring / wireless sensor networks / crystal offset compensation / synchronous accumulated error / continuous high frequency sampling clock analog-to-digital converter

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XIAN Hong-yu, DENG Lei, TANG Bao-ping, XIAO Xin. Synchronous accumulated error suppression method based on the crystal offset compensation for mechanical vibration wireless sensor networks#br#[J]. Journal of Vibration and Shock, 2019, 38(6): 132-136

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