Indoor positioning method based on distance measurement information fusion

Abstract

The invention discloses an indoor positioning method based on distance measurement information fusion, and relates to the technical field of communication methods of distance measurement. The method start from fusion of various kinds of measurement, and the method relying on Bluetooth and wireless network functions of a mobile phone is provided to realize precise indoor precision. Through a lognormal model, the received signal strength in Bluetooth and wireless network measurement is converted into distance information, a cost function of a distance difference is established, and a searching method is used to achieve the effect that precise positioning is realized by only two wireless network base stations. According to the method, two stations are selected from the stations relatively high in signal strength, so that the case that the lognormal channel model fails to depict a practical channel because of the factors of multipath, blocking and the like is avoided to the greatest extent; and the positioning method achieves a relatively good positioning effect under the condition of relatively low operation complexity.

Description

technical field [0001] The present invention relates to the technical field of communication methods for measuring distances, in particular to an indoor positioning method based on distance measurement information fusion. Background technique [0002] Indoor Positioning System (Indoor Position System, IPS) makes it possible to obtain location information of devices based on location services (such as tracking, navigation and monitoring, etc.). References [1] B.Hofmann, H.Wellinhof, and H.Lichtenegger, "GPS: Theory and Practice", Springer-Verlag, Vienna, 1997. Disclosed the outdoor view of the Global Positioning System (Global Position System, GPS) Under the transmission conditions of Line of Sight (LoS), meter-level positioning accuracy can be obtained, while the indoor environment is more complex and uncertain, which is caused by dense multipath effects and propagation effects dependent on building materials (reference [ 2] J.A.M. Ladd, K.E. Bekris, A.P. Rudys, D.S. Wallac...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an indoor positioning method based on ranging information fusion. The proposed method can not only provide higher positioning accuracy, but also get rid of the traditional trilateration algorithm that must be based on more than three wireless network base stations. In addition, the method can select two base stations with high signal strength, so as to avoid multipath, blocking and other factors that make the lognormal channel model unable to describe the actual channel situation; In the case of computational complexity, a better positioning effect is achieved

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