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Indoor positioning method based on WiFi hot spot

An indoor positioning and hotspot technology, which can be applied to services based on location information, services based on specific environments, and electrical components. Effect

Inactive Publication Date: 2018-08-28
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in an actual indoor WLAN environment, due to factors such as the complexity of the indoor environment, multipath effects, shadow effects, people moving around, channel congestion, and limited communication radius of nodes, the RSS of each AP collected on the RP The signal often shows complex and changeable characteristics, which seriously affects the accuracy of the positioning algorithm; on the other hand, the time complexity and scalability of the algorithm, and the storage capacity of the positioning processor should be considered comprehensively when designing the positioning algorithm

Method used

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  • Indoor positioning method based on WiFi hot spot
  • Indoor positioning method based on WiFi hot spot
  • Indoor positioning method based on WiFi hot spot

Examples

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Embodiment 1

[0036] On the one hand, an embodiment of the present invention provides an indoor positioning method based on WiFi hotspots, which is applied to an indoor environment with multiple WiFi hotspots, specifically including: based on the positions of multiple reference sample points in the indoor environment and each reference Establish a fingerprint database based on the received signal strength received from each WiFi hotspot at the sample point; use principal component analysis to extract the characteristics of the original fingerprint database data, and generate an eigenvalue fingerprint space; receive From the received signal strength of each hotspot and the received signal strengths of the target to be positioned from the plurality of hotspots, determine from the plurality of reference sample points that the distance to the target to be positioned is within a predetermined distance. A plurality of target reference sample points within a range; determining the positions of the ...

Embodiment 2

[0057] In order to make the benefits of the indoor positioning method based on WiFi hotspots provided by the present invention clearer compared with the existing indoor positioning methods, a real experiment was carried out, see figure 2 , the diagram shows the environment map of the real experiment and the setting diagram of sample reference points and AP nodes. The experimental environment is an area with a length of 60m and a width of 2m. In order to ensure the universal applicability and representativeness of the final results obtained in the experiment, this The experimental environment selected by the invention is an area where people move frequently and interfere with complex and changeable areas. After the experiment, specific data are recorded, and relevant conclusions are obtained by analyzing the specific data, as follows:

[0058] First, collect data according to a virtual grid of 1m×1m within a space range of 60m×2m. There are 62 reference nodes in total. The loca...

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Abstract

The invention discloses an indoor positioning method based on a WiFi hot spot, which comprises an offline stage and an online stage, wherein the offline stage comprises the steps that a sample reference point and an AP node for receiving the WiFi hot spot are set in a designated area range, and information of all the AP nodes of all the reference sample points is collected; the mapping relation between the information of each AP node collected by each sample reference point and the position information of the corresponding reference point is calculated, and a fingerprint database is established; and a characteristic fingerprint space of the fingerprint database is extracted by adopting a PCA analysis method based on MapReduce. The online stage comprises the following steps: an RSSI signalof each AP received at each sample reference point is collected on line through a positioning terminal, and therefore an RSSI signal vector is formed; the PCA analysis method is adopted to extract themain positioning characteristic of the RSSI signal vector, so as to obtain a characteristic vector of the RSSI signal of each sample reference point; and accurate positioning is carried out accordingto the characteristic vector of the RSSI signal and the data information of the characteristic fingerprint space by adopting an EWKNN algorithm based on MapReduce.

Description

technical field [0001] The invention relates to the technical field of wireless communication networks, is applicable to network management, and in particular relates to an indoor positioning method based on WiFi hotspots. Background technique [0002] With the development of computer technology and Internet applications, mobile terminal positioning has received extensive attention. Traditional satellite-based positioning technology, such as the global positioning system, can well meet the needs of outdoor positioning, but when used for indoor positioning, due to the influence of buildings on satellite signals, the positioning capability is greatly limited. On the contrary, wireless-based When the positioning system of network technology performs indoor positioning, the positioning effect is obviously improved. WLAN technology is more suitable for indoor positioning because of its simple indoor layout, wide deployment, and low price. In recent years, indoor positioning bas...

Claims

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Application Information

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IPC IPC(8): H04W4/02H04W64/00H04W4/021H04W4/33
CPCH04W4/02H04W4/021H04W4/023H04W4/33H04W64/00
Inventor 姜彦男何涛张健
Owner NANJING UNIV OF POSTS & TELECOMM
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