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Indoor and outdoor seamless positioning algorithm based on smart phone scene recognition

A technology for smart phone and scene recognition, which is applied to services based on location information, satellite radio beacon positioning systems, wireless communications, etc. It can solve the problems of signal attenuation, difficulty in providing high-precision positioning services, etc. Effect

Pending Publication Date: 2021-10-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The global satellite navigation system GNSS, which has been widely used outdoors, is difficult to provide high-precision positioning services indoors due to the problem of signal attenuation.

Method used

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  • Indoor and outdoor seamless positioning algorithm based on smart phone scene recognition
  • Indoor and outdoor seamless positioning algorithm based on smart phone scene recognition
  • Indoor and outdoor seamless positioning algorithm based on smart phone scene recognition

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Embodiment Construction

[0044] The technical scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples.

[0045] In step (1), the activity area is divided into four parts: an outdoor area, an outdoor transition area, an indoor transition area, and an indoor area according to the user's daily activity range. The outdoor area refers to the scene with no building obstacles and excellent GNSS observation conditions; the outdoor transition area refers to the semi-open scene that is close to buildings, viaducts, boulevards, etc. scenes; the opposite is true for indoor transition areas.

[0046] Step (2), in the four scenarios, use the original GNSS observation data of the smart phone to calibrate typical scene features, and it can be found that the number of visible satellites and the cumulative carrier-to-noise ratio of satellites have obvious differences in different scenarios, which can be used as scene feature observati...

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Abstract

The invention discloses an indoor and outdoor seamless positioning algorithm based on smart phone scene recognition, and the method comprises the steps: dividing a public daily activity scene into an outdoor region, an outdoor transition region, an indoor transition region and an indoor region, obtaining and analyzing the original observation data of a global navigation satellite system (GNSS) of a smart phone in the four scenes, establishing a hidden Markov model by using the number of satellites of GNSS signals received by a smart phone and a carrier-to-noise ratio as observation characteristics, and performing indoor and outdoor scene discrimination by using a Viterbi algorithm. Different positioning algorithms are selected in different areas according to scene recognition results, a high-precision GNSS positioning algorithm is adopted in an outdoor area, a Bluetooth positioning algorithm is adopted in an indoor area, and a fusion positioning algorithm is adopted in an indoor and outdoor transition area. By using the positioning algorithm provided by the invention, the positioning precision within 1m of a transition area can be improved.

Description

technical field [0001] The invention belongs to the technical field of indoor positioning, and in particular relates to an indoor and outdoor seamless positioning algorithm based on smart phone scene recognition. Background technique [0002] In the era of the Internet of Everything, all walks of life have a great demand for location-based services. Smartphones are one of the most important carriers for people to connect to the Internet of Things. How to make full use of the hardware devices and network communications in smartphones to effectively improve the quality of smartphones? High positioning accuracy and seamless indoor and outdoor switching are of positive significance to people's lives. [0003] In recent years, with the development of the mobile Internet and the maturity of positioning technology, more and more location-based services have appeared in people's lives. GNSS, which has been widely used outdoors, is difficult to provide high-precision positioning ser...

Claims

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Application Information

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IPC IPC(8): G01S19/46G01S19/48H04W4/021H04W4/80H04W64/00
CPCG01S19/46G01S19/48H04W4/80H04W4/021H04W64/00
Inventor 高成发刘琦张瑞成朋子涵尚睿
Owner SOUTHEAST UNIV