Control of accumulated multi-hop synchronous acquisition error based on the cross-layer design of machine vibration WSNs

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (9) : 97-102.

XIAO Xin, DENG Lei, TANG Baoping, HUANG Yi

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Abstract

Aimed at the problem that the error of synchronous acquisition method based on a cross-layer design would accumulate rapidly with network expansion, a transmission model for synchronous information was established, and its mechanism was analysed.It is found that the low real-time performance of embedded systems, the random jitter of crystal oscillator and the delay jitter of wireless link are the main reasons of error accumulation.Thus, a control method for the accumulated synchronous error based on the cross-layer design was proposed and a multipath cross-layer design was provided to capture synchronous information and trigger timer.A high accuracy crystal oscillator was adopted to suppress the jitter; The mathematical model for the random delay of wireless link was established, and the regression analysis was adopted to calibrate the caused errors such as the random jitter of synchronous information and the calculation error of transmission delay.Finally, a 4-hop network was constructed to evaluate the proposed method, which shows that the accumulated error is suppressed effectively.

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machine vibration monitoring / wireless sensor networks / multipath cross-layer design / synchronous acquisition

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XIAO Xin, DENG Lei, TANG Baoping, HUANG Yi. Control of accumulated multi-hop synchronous acquisition error based on the cross-layer design of machine vibration WSNs[J]. Journal of Vibration and Shock, 2020, 39(9): 97-102

References

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