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A sound wave signal frame code rate adjustment method for sound wave indoor positioning

A technology of acoustic wave signal and indoor positioning, which is applied in the direction of adjusting the transmission mode, the device dedicated to the receiver, positioning, etc., can solve the problems of code rate adjustment, etc., and achieves the goal of increasing the code rate, shortening the positioning period, and efficiently and accurately positioning the symbols. Effect

Active Publication Date: 2021-01-22
SUN YAT SEN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for adjusting the code rate of the acoustic signal frame for acoustic indoor positioning to solve the key technical problem of adjusting the code rate of the acoustic signal frame in the acoustic indoor positioning

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  • A sound wave signal frame code rate adjustment method for sound wave indoor positioning
  • A sound wave signal frame code rate adjustment method for sound wave indoor positioning
  • A sound wave signal frame code rate adjustment method for sound wave indoor positioning

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Embodiment 1

[0030] Such as figure 1 As shown, the framework diagram of the positioning system of the present invention mainly includes beacon nodes and mobile nodes. The beacon node is the reference point of the fixed coordinate system. This embodiment adopts the TDOA positioning algorithm, and at least 4 beacons are required for three-dimensional space positioning. This embodiment installs 4 beacons in an indoor positioning environment. The mobile node is a mobile target to be positioned, and in this embodiment is a mobile platform capable of real-time calculation.

[0031] figure 2 is a schematic diagram of system positioning in the present invention, node m in the figure 1 、m 2 、m 3 、m 4 is the beacon node of the system, and the corresponding coordinates are (x 1 ,y 1 ,z 1 ), (x 2 ,y 2 ,z 2 ), (x 3 ,y 3 ,z 3 ), (x 4 ,y 4 ,z 4 ). Node s is a mobile node to be located, and its coordinates are (x, y, z). The basic process of positioning is: multiple beacon nodes transm...

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Abstract

The invention discloses a sound wave signal frame code rate adjustment method for sound wave indoor positioning used for performing periodical transmission by using a sound wave signal of a digital mechanism. The method comprises the following steps: firstly, designing a frame structure of a sound wave signal; then setting a preferred code rate set of a beacon node, deducing a code element time length according to the known position information of the beacon node, and selecting an optical code rate in the preferred code rate set to set the beacon node; estimating, by a mobile node, the code element time length according to an STFT spectrum in a positioning process according to a preset available code rate in the preferred code rate set, and adaptively selecting the closest code rate in thepreferred code rate set to judge the code rate. By adoption of the method, the key technical problem of sound wave signal frame code rate adjustment in the sound wave indoor positioning is effectively solved, the design target of improving the code rate is improved while ensuring the decoding reliability, thereby shortening the positioning period and improving the positioning performance.

Description

technical field [0001] The present invention relates to the technical field of indoor positioning, and more particularly, to a method for adjusting the frame code rate of an acoustic wave signal for acoustic indoor positioning. Background technique [0002] With the development of the mobile Internet and the popularization of smart mobile terminals, location-based services have received widespread attention, and their applications have greatly changed people's lives. Positioning technology has a huge demand and broad prospects. Outdoors, GPS positioning technology has gained Widely used, but indoor GPS signal attenuation is too large, it is difficult to achieve effective positioning. However, there is an urgent need for indoor positioning technology in indoor places such as large shopping centers, exhibition halls, libraries, museums, hospitals, airports, large parking lots, and underground mining areas. Indoor positioning technology can realize the positioning and tracking...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00G01S5/18
CPCG01S5/18H04L1/0006H04L1/0036
Inventor 黄晓岳锐朱明保延翔郭东亮
Owner SUN YAT SEN UNIV
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