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Indoor locating algorithm based on WiFi and mobile terminal

An indoor positioning and mobile terminal technology, applied in wireless communication services, electrical components, wireless communication, etc., to achieve the effect of enhancing signal strength jitter, improving accuracy, and reducing requirements

Inactive Publication Date: 2014-02-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, provide an indoor positioning algorithm based on WiFi and mobile terminals, realize the fundamental problem of making up for the lack of fingerprint positioning accuracy in the algorithm, and overcome the problems caused by small-scale fading Positioning deviation, only by modifying the program, the effect of improving the positioning accuracy can be achieved, and accurate and high-synchronization indoor positioning can be realized

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  • Indoor locating algorithm based on WiFi and mobile terminal

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Embodiment Construction

[0026] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0027] Such as figure 1 As shown, a kind of indoor positioning algorithm based on WiFi and mobile terminal provided by the present invention comprises steps as follows:

[0028] Step 1: Capture the signal strength of the access point AP.

[0029] The capturing of the signal strength of the access point AP is to poll the terminal with a certain frequency for the acceptable signal strength of the access point AP through the client software installed on the terminal. Record the captured AP signal strength information and send it to the server. The information sent includes: the mac add...

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Abstract

Provided is an indoor locating algorithm based on a WiFi and a mobile terminal. The indoor locating algorithm based on the WiFi and the mobile terminal comprises the steps of (1) capturing signal strength of an AP, (2) carrying out time smoothness, (3) carrying out probability distribution searching, sorting smoothed signals, searching for the probability of the signal strength corresponding to positions in a database through algorithms, (4) calculating probability distribution of the positions of a whole indoor space, (5) eliminating results with obvious deviation according to historical information, (6) calculating a result, calculating a probability sum of obtained data, and (7) carrying out position smoothness according to the historical information, carrying out weighted average on the result calculated at the moment and the previous position, obtaining a smoothed result, using the smoothed result as output, and storing the smoothed result in the database for follow-up repeated calling. The indoor locating algorithm based on the WiFi and the mobile terminal solves the problems that WiFi indoor locating accuracy is poor, the calculation time is long, and an algorithm is unstable, and eliminates the locating deviation caused by small-scale fading, the effect of improving locating accuracy is achieved only through modification of procedures, and accurate and highly-synchronous indoor locating is achieved.

Description

technical field [0001] The invention relates to an indoor real-time positioning algorithm, in particular to an indoor precise positioning algorithm based on IEEE802.11 wireless local area network. Background technique [0002] At present, the demand for positioning technology is increasing. The most popular positioning technology is the Global Positioning System (GPS). This technology can obtain better accuracy in outdoor areas, but due to the way this technology is implemented, its positioning ability is greatly reduced in indoor environments. Therefore, it is urgent to find a feasible indoor positioning method to make up for the deficiency of the global positioning system. [0003] A feasible indoor positioning solution is realized by wireless local area network based on IEEE802.11. The traditional WiFi positioning method is realized by the triangulation positioning method, including methods based on time of arrival, time difference of arrival, and angle of arrival. The...

Claims

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Application Information

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IPC IPC(8): H04W4/04H04W64/00
Inventor 祝正元刘乾辰徐昌庆
Owner SHANGHAI JIAO TONG UNIV