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Construction method for fingerprint database in WiFi indoor positioning system

A technology of indoor positioning and construction method, which is applied in the construction field of fingerprint database in WiFi indoor positioning system, can solve the problems of fuzzy AP information, reduce the capacity of fingerprint database, etc., and achieve the effect of reducing capacity

Active Publication Date: 2016-02-17
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for constructing a fingerprint library in a WiFi indoor positioning system. In an indoor positioning system, it takes a lot of manpower and time to solve the offline establishment of a fingerprint library The problem of collecting a large amount of data multiple times solves the problem of AP selection, eliminates redundant and fuzzy AP information, and reduces the capacity of the fingerprint database

Method used

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  • Construction method for fingerprint database in WiFi indoor positioning system
  • Construction method for fingerprint database in WiFi indoor positioning system
  • Construction method for fingerprint database in WiFi indoor positioning system

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Embodiment Construction

[0069] The specific implementation of the present invention will be further described below in conjunction with the flowchart and specific examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0070] like figure 1 As shown, the fingerprint database construction method of the WiFi indoor positioning system provided by the present invention comprises the following steps:

[0071] Step 1: Establish a three-dimensional coordinate system in the positioning area, determine the reference point and position coordinates in the positioning area, select the reference point to be collected, and collect information such as the signal strength of the access point AP at the collection reference point.

[0072] First, select a reference point for each floor or plane area. The reference point evenly covers the area to be positioned. The intersection point of the equidistant gri...

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Abstract

The invention discloses a construction method for a fingerprint database in a WiFi indoor positioning system, and belongs to the technical field of indoor wireless communication and networks. The method comprises the steps that original signal intensity RSSI is acquired on reference points; then RSSI data are preprocessed; selection of excellent APs is performed by the preprocessed data; then excellent AP signal intensity characteristics of each reference point are extracted; integrity of AP signal intensity is detected; compensation of signal intensity is performed on the reference points with missing data through detection; reference point signal intensity which is not acquired is reckoned; and finally the fingerprint database is generated. According to the method, influence of indoor environment on signal intensity is considered, and the propagation law of signal intensity is fully utilized so that the problems that the conventional fingerprint database construction process is high in acquisition workload and fingerprint information is incomplete can be solved. Field acquisition cost of the construction phase of the fingerprint database is reduced and redundant APs with fuzzy distinguishing of position points are eliminated under the condition that accuracy of the fingerprint database is not reduced so that storage space of the fingerprint database is reduced.

Description

technical field [0001] The invention belongs to the field of WiFi indoor positioning, and more particularly relates to a method for constructing a fingerprint database in a WiFi indoor positioning system. Background technique [0002] In recent years, with the rapid development of mobile communication technology, location-based services (LBS) are increasingly favored by people, and the core technology is positioning technology. Global Positioning System (GPS) can achieve very good positioning accuracy outdoors. However, GPS cannot locate indoors and in cities with high-rise buildings because it cannot sense satellite signals. Therefore, it is urgent to find a feasible indoor positioning method to make up for the deficiency of GPS system. [0003] The wireless local area network based on 802.11b / g / n protocol has been rapidly developed and popularized in recent years, and is widely distributed in homes, campuses, offices, underground parking lots and entertainment places. T...

Claims

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Application Information

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IPC IPC(8): H04W4/04G01S5/06
CPCG01S5/06H04W84/12
Inventor 诸彤宇赵福丹陈征
Owner BEIHANG UNIV
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