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Indoor positioning method based on channel response frequency domain and airspace combined processing

A technology of channel response and joint processing, applied in the service based on location information, service based on specific environment, wireless communication, etc., can solve the problems of being in the experimental stage, poor positioning accuracy, unclear relationship between fingerprint and position function, etc. The function relationship is simple and clear, the effect of increasing spatial resolution and reducing offline workload

Active Publication Date: 2019-04-09
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The WIFI signal propagation environment for indoor positioning is not only complex, such as multipath effects, shadows, fading, and delay distortion, but also easily blocked by crowds or obstacles, resulting in large signal fluctuations
If you directly use the WIFI signal strength to do simple geometric algebra operations, it will often lead to large deviations in positioning results
The limited bandwidth of the WIFI system cannot accurately estimate the arrival time or angle of arrival of the signal, so there will be no more accurate positioning results
[0004] However, in the existing positioning methods based on WIFI fingerprint identification, most of the functional relationship between fingerprints and positions is not clear. When there is strong interference indoors, the robustness of fingerprint features is poor, which makes the positioning accuracy poor.
In addition, fingerprint information of a large number of reference points needs to be collected indoors in advance. When the indoor area is too large, the database is often relatively large
This makes the computational complexity and time complexity of online positioning high
Therefore, the current WIFI-based fingerprint recognition scheme can only be in the experimental stage.

Method used

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  • Indoor positioning method based on channel response frequency domain and airspace combined processing
  • Indoor positioning method based on channel response frequency domain and airspace combined processing
  • Indoor positioning method based on channel response frequency domain and airspace combined processing

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Embodiment Construction

[0070] see figure 1 , the present invention provides an indoor positioning method based on joint processing of channel response frequency domain and air domain, including an offline stage and an online positioning stage. The terminal moves at a constant speed at each reference point, collects channel information in two directions perpendicular to each other, preprocesses the collected data, extracts corresponding fingerprint features, and uses the relationship between fingerprints in the perpendicular direction to establish an offline database; The fingerprint data of each point contains position information and feature information; in the online positioning stage, the online fingerprint information is extracted by collecting the signal data of the unknown mobile terminal, and the fingerprint information of the terminal to be tested is matched with the fingerprint in the offline database, and then according to the similarity The criterion calculates the location of the termina...

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Abstract

The invention discloses an indoor positioning method based on channel response frequency domain and airspace combined processing. The method comprises the following steps: discretizing a positioning area in an indoor environment and generating a plurality of reference points in an offline stage; enabling the mobile terminal to move at a constant speed at each reference point, acquiring channel information in two mutually perpendicular directions, preprocessing the acquired data, extracting corresponding fingerprint characteristics from the acquired data, and establishing an offline database byutilizing a relation between fingerprints in the mutually perpendicular directions; collecting the signal data of an unknown motion terminal in the online positioning stage, extracting the online fingerprint information, matching the fingerprint information of a to-be-tested terminal with fingerprints in an offline database, calculating the position of the to-be-tested terminal according to the similarity criterion, and outputting the position information of the to-be-tested terminal through the offline database and completing the indoor positioning. Rapid positioning of a target is realized,and the positioning time is effectively reduced. Position estimation is carried out by using a WKNN algorithm, so that more accurate positioning is realized.

Description

technical field [0001] The invention belongs to the technical field of indoor positioning, and in particular relates to an indoor positioning method based on joint processing of channel response frequency domain and air domain. Background technique [0002] There are many kinds of existing indoor positioning methods, such as infrared sensor (Infrared Sensor), ultrasonic (Ultrasonic Wave), ultra wide bandwidth (Ultra Wide Bandwidth), RFID (Radio Frequency Identification) and so on. Although these methods have high positioning accuracy, they all need to install special hardware equipment, and some hardware is expensive and not suitable for mass deployment, which limits their popularization. [0003] Traditional WIFI indoor positioning methods include: distance model-based and fingerprint information-based methods. The biggest problem with these two methods is the problem of positioning accuracy. The WIFI signal propagation environment for indoor positioning is not only compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04W4/33H04W64/00
CPCH04W4/023H04W4/33H04W64/006
Inventor 陈志刚张梦雅马文飞陈禄
Owner XI AN JIAOTONG UNIV
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