Orthogonal Chirp-Based Ultrasonic Positioning

Sensors

Xinde Li¹  Shuzhi Sam Ge¹  Mohammad Omar Khyam¹  Mark Pickering² 

[1] Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117580, Singapore;School of Engineering and Information Technology, University of New South Wales, Canberra, Campbell ACT 2612, Australia;

关键词: multiple access;    time-of-flight;    orthogonal chirp;    ultrasonic indoor positioning;   

DOI  :  10.3390/s17050976

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown