Indoor positioning method for receiving signal strength ordering fingerprint

A technology for receiving signal strength and indoor positioning, which is applied in wireless communication, wireless communication services, electrical components, etc., and can solve problems such as positioning errors and different received signal strengths

Inactive Publication Date: 2014-05-14
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0007] In the indoor positioning technology using received signal strength, due to the software and hardware differences of different type

Method used

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  • Indoor positioning method for receiving signal strength ordering fingerprint
  • Indoor positioning method for receiving signal strength ordering fingerprint
  • Indoor positioning method for receiving signal strength ordering fingerprint

Examples

Experimental program
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Embodiment Construction

[0025] Taking an indoor room with a length and width of 5 meters and an environment covered by five wireless access points (APs) as an example, the specific implementation steps of the indoor positioning method provided by the present invention are described:

[0026] Step (1), first establish a Cartesian coordinate system based on the floor plan of the room, mark the origin as the first sampling point, and record it as the reference point 1 (0,0), and then establish a sampling point every one meter, so as to By analogy, 36 sampling points are marked all over the plan, that is, 36 reference points, such as figure 2 shown;

[0027] Step (2), when the terminal with WiFi function is at the reference point 1 (0,0), it can scan 5 access nodes AP. At this time, the WiFi terminal device can detect the received signal strength of AP1~AP5 at the sampling point Value RSSI, namely -66, -73, -100, -90, -80, unit: dBm;

[0028] Step (3), the terminal sorts the measured 5 RSSI values, an...

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Abstract

The invention, which belongs to the wireless positioning field, relates to an indoor positioning method for receiving a signal strength ordering fingerprint. The method comprises the following steps that: the number of sampling points spreading in a whole positioning area is determined; sampling point traversal is carried out, received signal strength indicator (RSSI) values of signal strengths of k wireless access points (AP) are obtained by detection at each sampling point, and arrangement is carried out to obtain an RSSI sequence, wherein each RSSI corresponds to one MAC address and the RSSI sequence ad the MAC addresses form sampling point position fingerprints jointly; the coordinates and the position fingerprints of the sampling points are stored into a fingerprint database; AP scanning is carried out at an unknown position to obtain a position fingerprint of an unknown position C and the MAC address sequence in the position fingerprint of the position C is matched with MAC address sequences of the position fingerprints of all sampling points in the fingerprint database; and a geographical coordinate corresponding to the sampling point with consistent matching is used as the current position of the unknown position C a. According to the invention, relative sequences of RSSIs of different APs are used as fingerprints and thus a positioning error caused by different RSSI absolute values by different wireless terminal scanning can be avoided.

Description

technical field [0001] The present invention relates to the field of wireless positioning, in particular to a WiFi indoor positioning method suitable for heterogeneous terminals. Background technique [0002] In recent years, with the rapid development of the mobile Internet and the rapid increase of data and multimedia services, people's demand for indoor positioning is increasing. In urban life, low-cost, high-precision indoor positioning has important practical significance: in supermarkets, by obtaining personal location information of consumers and target product location information, it is possible to guide routes and realize intelligent shopping guides; in sudden disasters On-site, through indoor positioning, rescuers can be guided to quickly rescue trapped people; in hospitals, the positioning and supervision of patients, doctors and medical equipment is conducive to improving efficiency. [0003] At present, GPS satellite positioning, which is widely used, can only...

Claims

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Application Information

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IPC IPC(8): H04W4/04H04W64/00
Inventor 黎海涛吕海坤齐双
Owner BEIJING UNIV OF TECH
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