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Sensors 2017, 17(5), 976;

Orthogonal Chirp-Based Ultrasonic Positioning

Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117580, Singapore
Key Laboratory of Measurement and Control of CSE, School of Automation, Southeast University, Ministry of Education, Nanjing 210096, China
School of Engineering and Information Technology, University of New South Wales, Canberra, Campbell ACT 2612, Australia
Author to whom correspondence should be addressed.
Academic Editors: Jesús Ureña, Álvaro Hernández Alonso and Juan Jesús García Domínguez
Received: 15 March 2017 / Revised: 18 April 2017 / Accepted: 24 April 2017 / Published: 27 April 2017
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This paper presents a chirp based ultrasonic positioning system (UPS) using orthogonal chirp waveforms. In the proposed method, multiple transmitters can simultaneously transmit chirp signals, as a result, it can efficiently utilize the entire available frequency spectrum. The fundamental idea behind the proposed multiple access scheme is to utilize the oversampling methodology of orthogonal frequency-division multiplexing (OFDM) modulation and orthogonality of the discrete frequency components of a chirp waveform. In addition, the proposed orthogonal chirp waveforms also have all the advantages of a classical chirp waveform. Firstly, the performance of the waveforms is investigated through correlation analysis and then, in an indoor environment, evaluated through simulations and experiments for ultrasonic (US) positioning. For an operational range of approximately 1000 mm, the positioning root-mean-square-errors (RMSEs) &90% error were 4.54 mm and 6.68 mm respectively. View Full-Text
Keywords: multiple access; time-of-flight; orthogonal chirp; ultrasonic indoor positioning multiple access; time-of-flight; orthogonal chirp; ultrasonic indoor positioning

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Khyam, M.O.; Ge, S.S.; Li, X.; Pickering, M. Orthogonal Chirp-Based Ultrasonic Positioning. Sensors 2017, 17, 976.

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