TOA Estimation Method in Frequency Domain for Acoustic Ranging of WSN Node

Meng Ling-jun; Wang Hong-tao; Xia Shan-hong

doi:10.3724/SP.J.1146.2009.00127

Volume 32 Issue 4

Dec. 2010

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Meng Ling-jun, Wang Hong-tao, Xia Shan-hong. TOA Estimation Method in Frequency Domain for Acoustic Ranging of WSN Node[J]. Journal of Electronics & Information Technology, 2010, 32(4): 993-997. doi: 10.3724/SP.J.1146.2009.00127

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Meng Ling-jun, Wang Hong-tao, Xia Shan-hong. TOA Estimation Method in Frequency Domain for Acoustic Ranging of WSN Node[J]. Journal of Electronics & Information Technology, 2010, 32(4): 993-997. doi: 10.3724/SP.J.1146.2009.00127

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TOA Estimation Method in Frequency Domain for Acoustic Ranging of WSN Node

doi: 10.3724/SP.J.1146.2009.00127

Meng Ling-jun^{①②;王宏涛
,},
Wang Hong-tao,
Xia Shan-hong

Received Date: 2009-01-21
Rev Recd Date: 2009-10-20
Publish Date: 2010-04-19

Abstract

Abstract

A new method of TOA (time of arrival) estimation in frequency domain used for wireless sensor nodes acoustic ranging is proposed in this paper. It shows higher accurate results under lower signal-noise-ratio applications compare to the time-domain method such as amplitude detection. It is based on Goertzel algorithm for short time frequency analyses. Fixed point algorithm is achieved by adjusting acoustic ranging signals frequency and window length. The computation of the algorithm can be done during one sampling period of microcontroller. A multi-magnitude threshold TOA estimate method is also studied for reducing the errors further. The algorithm has been tested on a node with a dsPIC6014A microprocessor. Experimental results show that the performance is better than those in time-domain. The acoustic ranging error is less than 3% at the distance of 25 meters.

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References

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