Abstract
Ultrasonic localization system using trilateration has been adopted in various types of full-enclosed and semi-enclosed space. For small-scale or enclosed scenarios, there is an important phenomenon, that is, the ultrasonic wave may rapidly reflect back and forth between the walls to form different normal waves during the process of propagation, which may break the inverse square law of sound intensity (the sound intensity in free space is inversely proportional to the square of the distance). The other problem is that the sound intensity of some local corner points are obviously stronger than those points near the acoustic source, which may confuse the ultrasonic receivers and bring significant differences in measurement errors. To avoid excessive errors influence for the positioning accuracy, in this article, a novel ultrasonic localization method based on receiver array optimization schemes is reported. The main purpose is to activate the ultrasonic receiver in the area as well as shield the ultrasonic receiver outside the area. The system error will be reduced based on this method, and most of the redundant data will be eliminated. The simulation results are visualized and compared with the existing methods. The positioning accuracy measured by our method is increased significantly.
Highlights
Location-based service is ubiquitous with the high-speed Internet and has wide applications.[1]
An ultrasonic localization method based on receiver array optimization schemes is presented
We use the excellent properties of Delaunay triangulation (DT) to partition the active indoor sound field space and combine theory of room acoustics and computer graphics to filter out large-error data
Summary
Location-based service is ubiquitous with the high-speed Internet and has wide applications.[1]. The other location technology is to make use of pre-deployed additional base stations (BS) to achieve precise indoor positionings, such as radio frequency identification (RFID),[3,4] ultra-wideband (UWB),[5,6,7,8,9] Li-Fi,[10] ultrasound,[11,12,13,14,15,16,17,18] Bluetooth,[19,20] and ZigBee[21] technology.
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