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Indoor fingerprint positioning method based on interpolation

A fingerprint positioning and interpolation technology, which can be used in positioning, measuring devices, instruments, etc., and can solve problems such as cumbersome fingerprint reconstruction.

Active Publication Date: 2016-11-23
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] The present invention aims to solve the above-mentioned shortcomings of the prior art, and proposes an indoor fingerprint positioning method based on interpolation. This method only needs to measure the RSSI values ​​of a small number of sample nodes with known positions in the positioning area to be able to locate unknown position points in the positioning area. The optimal unbiased estimation of the RSSI value, and finally the matching algorithm is used to calculate the actual position of the node, which effectively solves the problem of tedious fingerprint reconstruction caused by changes in the indoor environment

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  • Indoor fingerprint positioning method based on interpolation

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[0051] Further illustrate the present invention below in conjunction with accompanying drawing.

[0052] The interpolation-based indoor fingerprint positioning and positioning method of the present invention comprises the following steps: Step 1, Kalman filtering;

[0053] Step 11, the present invention performs positioning by establishing the RSSI vector fingerprint of the positioning area. However, the RSSI signal collected by the sensor is not stable and is easily affected by interference noise. The Kalman filter is an effective algorithm for Gaussian process optimal filtering, and the target RSSI value is obtained after processing;

[0054] Step 2, collaborative kriging interpolation algorithm;

[0055] In step 21, the Cokriging algorithm can optimally and unbiasedly estimate the regionalization variables in a limited area, so it is well suited for RSSI value prediction in an area. Co-Kriging algorithm refers to a multi-variable Kriging algorithm that introduces co-regi...

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Abstract

The invention provides an indoor fingerprint positioning method based on interpolation. The method comprises the following steps: 1, performing Kalman filtering processing on a to-be-processed RSSI (received signal strength) value on a known position; 2, performing optimized unbiased linear estimation on the RSSI value on an unknown point in the positioned region according to the processed RSSI sample on a known position by using a Cokriging interpolation algorithm; 3, repeating step 1 and step 2 on all beacon nodes, and joining all one-dimensional fingerprint vectors to successfully construct a multi-dimensional fingerprint vector in the positioned region; 4, calculating cells corresponding to former number vectors from high to low by using a vector similarity matching algorithm, namely the node positioned range; and 5, classifying the former number of cells by adopting a K-medoides clustering algorithm, and extracting the cluster head (the geometric center of a cluster) with the largest number of cells to serve as actual positioning result of nodes to output.

Description

technical field [0001] The invention mainly relates to the field of wireless sensor network indoor positioning, and relates to an indoor fingerprint positioning method based on interpolation. Background technique [0002] With the popularization of sensor networks, users pay more and more attention to the actual location information of sensor devices. At present, there are many wireless positioning technologies, such as outdoor positioning technologies such as GPS and AGPS and indoor positioning technologies such as outdoor, WIFI, and Bluetooth. Among them, GPS is relatively mature. It uses TDOA to locate based on signal transmission time difference. This positioning technology has high accuracy outdoors. In the field of indoor positioning, due to the complexity and uncontrollability of the indoor environment, many indoor positioning technologies have specific application scenarios. [0003] At present, the wireless sensor network indoor positioning technology at home and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00G01S5/02
CPCG01S5/0252H04W64/006
Inventor 毛科技方飞方凯李鹏欢孙俊生施伟元
Owner ZHEJIANG UNIV OF TECH
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