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Sound-based positioning

A sound and sound signal technology, applied in positioning, instruments, measuring devices, etc., can solve the problems of communication capability, sensing capability, internal clock accuracy, limited available power, difficulty in obtaining highly accurate real-time location information, and the inability of GPS. good operation etc.

Active Publication Date: 2015-03-25
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Global Positioning System (GPS) technology does not work well inside enclosed buildings, where communication between mobile devices and GPS satellites may be impeded by surrounding structures
Additionally, available consumer devices are limited in their communication capabilities, sensing capabilities (e.g. mobile device microphones), accuracy of their internal clocks, available power, etc.
Therefore, obtaining highly accurate real-time location information about mobile users within closed buildings (or where GPS positioning is for some reason unavailable) is difficult without significant modifications to the hardware of the available mobile devices

Method used

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Examples

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Embodiment Construction

[0012] Some modern mobile devices, such as smartphones, include microphones capable of detecting ultrasonic signals, which presents the opportunity to perform ultrasonic-based positioning using consumer-grade mobile devices. The ultrasound bandwidth that these devices can detect is currently narrow (eg, between 20KHz and 22KHz). However, ultrasonic signals can function within this limited bandwidth while providing sufficient information to allow determination of the location of the receiving device relative to the source of the ultrasonic signal.

[0013] For example, one implementation includes sound signal sources (eg, speakers) throughout a given area. The sound signal emitted by the sound signal source is received by one or more receiving devices (for example, a mobile device with a microphone capable of accurately capturing ultrasonic sound signals), and one or more receiving devices use the received sound signals to calculate a given location within the area. A receivi...

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Abstract

A receiving device captures sounds signals (e.g., ultrasonic) from multiple sound signal sources, selects the sound signals satisfying a reliability condition for use in determining an initial position of the receiving device relative to the corresponding sound signal sources, determines the initial position of the receiving device using multilateration of the selected sound signals, and updates the current position of the receiving device as the reliability of individual sound signals varies in the presence of dynamically changing environmental interference, multipathing, and movement between the receiving device and the sound signal sources.

Description

technical field [0001] The present invention relates to the communication field, in particular to positioning technology. Background technique [0002] Accurately determining the location of a user or mobile device within an indoor setting presents various challenges. For example, Global Positioning System (GPS) technology does not work well inside enclosed buildings, where communication between mobile devices and GPS satellites may be impeded by surrounding structures. Furthermore, available consumer devices are limited in their communication capabilities, sensing capabilities (eg, mobile device microphones), accuracy of their internal clocks, available power, and the like. Therefore, obtaining highly accurate real-time location information about mobile users within closed buildings (or where GPS positioning is for some reason unavailable) is difficult without significant modifications to the hardware of the available mobile devices . Contents of the invention [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/26
CPCG01S5/18G01S5/26
Inventor M·R·哈瑞尔W·H·康纳M·R·帕尔塞蒂亚J·C·柯兰德尔H·弗里克J·赖特M·J·巴克梅尔
Owner MICROSOFT TECH LICENSING LLC