Design of Chirp Waveforms for Multiple-access Ultrasonic Indoor Positioning
RIS ID
128618
Abstract
In ultrasonic positioning systems (UPSs) chirp waveforms have attracted much attention due to its high range resolution. However, the multiple-access schemes for 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. Firstly, the efficiency of the proposed methodology is evaluated by several metrics and then, in an indoor environment, through simulations and experiments for ultrasonic positioning.
Publication Details
M. Omar. Khyam, M. Noor-A-Rahim, X. Li, C. Ritz, Y. Liang. Guan & S. Sam. Ge, "Design of Chirp Waveforms for Multiple-access Ultrasonic Indoor Positioning," IEEE Sensors Journal, vol. 18, (15) pp. 6375-6390, 2018.