Abstract: The present invention discloses an item locating and finding method, system and device based on acoustic signal, which relates to the field of item location, and aims at solving the problems in the prior art that a specific directional angle of the item cannot be detected and the technical solutions in the prior art are not suitable for common intelligent terminals and are greatly affected by the environmental noise; performing unilateral and bidirectional ranging based on the acoustic signal; and performing location by using acoustic ranging and PDR.

Abstract: The present disclosure belongs to technical field of indoor positioning, and discloses a method and system for wide-area acoustic indoor positioning based on RF enhancement, comprising: design of an acoustic signal, using Blackman window function to control the amplitude of acoustic signal entering and leaving channel; a mixed multiple access transmission of the acoustic signal, combining three multiple access schemes of time, space and frequency, assisting a small amount of BLE signals, and constructing a wide-area coverage capability of the acoustic positioning signal; acoustic measurement based on RF enhancement, including TOA estimation of an acoustic signal and area identification based on low-power Bluetooth RSS; robust fusion positioning of an inertial sensor and multi-source measurement, including pedestrian walking speed estimation, multi-source heterogeneous measurement, acoustic measurement compensation and correction, measurement quality evaluation and control.

Abstract: The present disclosure belongs to the technical field of acoustic positioning, and discloses an acoustic positioning system and method for a smartphone and a wearable device, and a terminal. A ranging signal is transmitted by virtue of a base station network, and specific space signals of which the frequencies are 12 kHz to 21 kHz are designed; the ranging signal is received and decoded by virtue of a user terminal, distances from base stations to the user terminal are estimated according to the first arrival signals, and the position of a user is estimated according to a plurality of distances measured on the position of the user. The present disclosure provides the acoustic positioning system (APS) for the smartphone and the wearable device, which is a technology for precise ranging based on acoustic waves.