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Pedestrian route matching method based on alignment of geomagnetic field intensity sequence feature points

A technology of magnetic field strength and feature point pair, which is applied in the direction of navigation, measuring devices, instruments, etc. through velocity/acceleration measurement, which can solve the problems of limited accuracy, difficulty in accurately calculating step length and heading, etc., to avoid errors and time complexity. The effect of reducing and avoiding estimates

Active Publication Date: 2018-06-05
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI +1
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Problems solved by technology

However, due to the limited accuracy of the built-in inertial device of the smart phone, and the change of the user's posture when using the smart phone, it is difficult to accurately calculate the step length and heading

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  • Pedestrian route matching method based on alignment of geomagnetic field intensity sequence feature points
  • Pedestrian route matching method based on alignment of geomagnetic field intensity sequence feature points
  • Pedestrian route matching method based on alignment of geomagnetic field intensity sequence feature points

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0046] The present invention provides a pedestrian path matching method based on feature point alignment of geomagnetic field strength sequence, specifically:

[0047] 1. The two sets of magnetic field strength sequences to be processed are Mag 1 and Mag 2 , in the magnetic field strength sequence Mag 1 and Mag 2 Find a set of spatially consistent feature points in the set, and align the two sequences at the set of feature points, and then align the other feature points with the set of feature points as the benchmark; after alignment, the length of the two sequences is unified by linear interpolation , get the new sequence Mag new1 with Mag new2 ;

[0048] 2. Calculate the correlation coefficient cc of the two new sequences;

[0049] 3. Repe...

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Abstract

The invention provides a pedestrian route matching method based on the alignment of geomagnetic field intensity sequence feature points. The method comprises the following specific steps: finding a group of spatially consistent feature points from two groups of to-be-processed magnetic field intensity sequences, aligning two sequences at the group of the feature points, sequentially aligning the other feature points nearby by taking the group of the feature points as a standard, and carrying out linear interpolation to finish length unification of two sequences, so to obtain two groups of newsequences; (2) calculating correlation coefficients of the two sequences; (3) repeatedly carrying out the steps, so as to obtain the maximum correlation coefficients of the two sequences; and (4) setting a similarity threshold, and judging the two sequences with the maximum correlation coefficients larger than the threshold as data in the same route, wherein the relative positions of the sequencesare determined according to the relative positions of initial points of two groups of the aligned sequences. According to the method, the feature points in the magnetic field sequences are recognized, so that the size unification of geomagnetic sequences is finished, and furthermore, the accurate matching of geomagnetic sequences in the same space is realized.

Description

technical field [0001] The invention belongs to the technical field of indoor positioning, and in particular relates to a pedestrian path matching method based on geomagnetic field intensity sequence feature point alignment, which can be used in fingerprint map construction based on crowdsourcing data and geomagnetic sequence matching and positioning. Background technique [0002] With the rapid development of mobile Internet and smart terminals, various Internet services based on geographical location are continuously derived, and people's demand for indoor positioning is becoming more and more intense. At present, the commonly used indoor positioning methods in mass consumer application scenarios mainly include positioning methods based on WLAN / BLE signal strength fingerprints, indoor positioning methods based on geomagnetic field, and positioning based on inertial sensors. The positioning method based on the signal strength fingerprint needs to collect the signal strength...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/16
CPCG01C21/165
Inventor 李雯魏东岩纪新春来奇峰李祥红袁洪
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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