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Pseudo-orthogonal chirp-based multiple ultrasonic transducer positioning

journal contribution
posted on 27.10.2020, 00:00 by Mohammad Khyam, SS Ge, X Li, MR Pickering
Distance-based ultrasonic positioning systems (UPSs) using the trilateration algorithm have been adopted in various types of applications across a wide variety of fields. Recently, the use of a chirp signal in conjunction with cross-correlation has drawn a considerable amount of attention for UPSs. However, when they use a chirp signal for positioning, they suffer from the multiple-access problem due to signal interference. In this paper, to solve this problem, we propose two sets of pseudo-orthogonal chirp waveforms. The basic idea behind the first one is to exploit the orthogonality of the sub-carriers of a chirp waveform, i.e., the discrete frequency components of a chirp waveform, whereas the second one not only exploits the orthogonality of the sub-carriers of a chirp waveform but also chirp rates as a mechanism for assigning uniquely modulated chirp signals to the transmitters. All the waveforms contained in each set have good orthogonality and all the advantages of a classic chirp waveform. First, the performances of the waveforms are investigated through correlation analysis and then, in an indoor environment, evaluated through simulations and experiments for ultrasonic positioning.

History

Volume

17

Issue

12

Start Page

3832

End Page

3843

Number of Pages

12

eISSN

1558-1748

ISSN

1530-437X

Publisher

IEEE

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of New South Wales; Southeast University, China; National University of Singapore

Era Eligible

Yes

Journal

IEEE Sensors Journal

Exports

CQUniversity

Exports