Simultaneous Excitation Systems for Ultrasonic Indoor Positioning

Mohammad Omar Khyam*, Md Noor A. Rahim, Xinde Li, Aruna Jayasuriya, Md Apel Mahmud, Amanullah Maung Than Oo, Shuzhi Sam Ge

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The ultrasonic technology is a tool for indoor positioning systems (IPSs) and has been extensively used in many applications. In ultrasonic IPSs (UIPSs), the use of a chirp signal (in which the frequency varies with time) is widespread due to its capability to obtain high-range resolution through its time-frequency characteristic. It also provides an opportunity to design effective waveform diversity which has always been the key to mitigating multiple-access interference (MAI) in multi-user UIPSs. To explore this, we analyze the chirp signal from the signal design perspective, with the goal of developing a precise and efficient UIPS for multi-user environments. To achieve this, three waveform diversity design schemes are proposed in which all the benefits of the classical chirp, such as high-range resolution, are retained while all the transmitters can transmit chirp signals simultaneously. In each scheme, a linear chirp is divided into two linear sub-chirps with diverse durations and/or bandwidths. This process is optimized by selecting the concatenated sub-chirps that generate a waveform which has a high-range resolution and relatively low interference in the same scheme. Initially, the effectiveness of the proposed schemes is evaluated for five simultaneous excitation signals using several metrics and experimental results are then presented for the ultrasonic indoor positioning.

Original languageEnglish
Article number9133115
Pages (from-to)13716-13725
Number of pages10
JournalIEEE Sensors Journal
Volume20
Issue number22
Early online date3 Jul 2020
DOIs
Publication statusPublished - 15 Nov 2020
Externally publishedYes

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