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Design of chirp waveforms for multiple-access ultrasonic indoor positioning

journal contribution
posted on 14.10.2020, 00:00 by Mohammad Khyam, M Noor-A-Rahim, X Li, C Ritz, YL Guan, SS Ge
In ultrasonic positioning systems (UPSs) chirp waveforms have attracted much attention due to its high range resolution. However, the multiple-access schemes for the chirp-based UPS are limited. In its application to multiple-access ultrasonic positioning, effective waveform diversity design is a prerequisite. In a multiple-access UPS, each transmitter should transmit a unique waveform with impulse-like auto-correlation and relatively flat cross-correlations to the waveforms transmitted by other transmitters. Proposed in this paper is a methodology whereby multiple transmitters can transmit chirp signals simultaneously. The chirp waveforms are constructed by concatenating a number of linear sub-chirps of the same durations and bandwidths but different starting and stopping frequencies. This process is optimized by selecting sequences with impulse-like auto-correlations and relatively flat cross-correlations. First, the efficiency of the proposed methodology is evaluated by several metrics and, then, in an indoor environment, through simulations and experiments for ultrasonic positioning.

History

Volume

18

Issue

15

Start Page

6375

End Page

6390

Number of Pages

16

eISSN

1558-1748

ISSN

1530-437X

Publisher

IEEE

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Singapore, Nanyang Technological University, Singapore; University of Wollongong

Era Eligible

Yes

Journal

IEEE Sensors Journal

Exports

CQUniversity

Exports