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A Location Map Construction Method Based on Virtual Source Estimation and Trajectory Correction

A map construction and trajectory technology, which can be used in services based on location information, services based on specific environments, positioning, etc., and can solve problems such as bloated fingerprint database errors and rough user trajectories.

Active Publication Date: 2020-12-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a positioning map construction method based on virtual source estimation and trajectory correction, the purpose of which is to construct an accurate lightweight fingerprint database through virtual source parameter estimation and Accurate user movement trajectory is obtained, thereby solving the technical problems of rough user trajectory acquisition, bloated fingerprint database construction and large errors in existing positioning technologies

Method used

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  • A Location Map Construction Method Based on Virtual Source Estimation and Trajectory Correction
  • A Location Map Construction Method Based on Virtual Source Estimation and Trajectory Correction
  • A Location Map Construction Method Based on Virtual Source Estimation and Trajectory Correction

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Embodiment 1

[0129] Such as Figure 4 As shown, the scene in Embodiment 1 of the present invention can be divided into three sub-areas according to whether there is obvious wall occlusion, including straight corridors at both ends and a square area in the center of the target area. The central square area has hollow railings instead of solid walls, so it can be divided into an open sub-area. The straight corridors at both ends are 29.7m long and 2.4m wide, and the central square area is 15.6m long and 18m wide. N=492 signal sources can be measured in the scene, and the signal strength of at least one signal source can be received at any position in the scene. The number of physical space clusters and signal space clusters divided in each sub-area is 49 (straight corridors at both ends) and 42 (central square area) respectively.

[0130] Use Mi 6 smart phone as the terminal to measure the signal strength. The sampling data is divided into two parts, one is dynamic walking sampling data, ...

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Abstract

The invention discloses a positioning map construction method based on virtual signal source estimation and trajectory correction. The positioning map construction method comprises the steps that N signal sources are set in a positioning scene, the positioning scene is divided into P sub-regions, a user rough walking trajectory is reconstructed by using crowdsourced sample data, positioning samples in the user rough walking trajectory are obtained, and the weight of the strength of each signal in fingerprints in the positioning samples is calculated; a fingerprint database is constructed by using the selected positioning samples; meanwhile, the constructed fingerprint database can correct the user trajectory in the user trajectory reconstruction stage to further improve the accuracy of thecrowdsourced sample data; and the virtual signal propagation curve surface of each signal source in each sub-region is reconstructed by a virtual signal source estimation method for each signal source in each sub-region. The positioning map construction method can solve the problems of inaccurate construction of the fingerprint database, low positioning accuracy and the bloated construction of the fingerprint database which takes up a lot of space due to unreasonable use of a crowdsourced sample in an existing positioning map construction method.

Description

technical field [0001] The invention belongs to the technical field of communication and wireless network, and more specifically relates to a positioning map construction method based on virtual source estimation and trajectory correction. Background technique [0002] With the explosive development of the information age, people's demand for location information is also increasing. Since GPS positioning technology is based on satellite signal positioning technology, its application scenarios are only limited to outdoors without signal blockage. Faced with large-scale indoor environments, such as airports, shopping malls, and schools, people have very urgent needs for high-precision indoor positioning. In recent years, indoor positioning technology has been widely studied, and various indoor positioning technologies including WiFi positioning, Bluetooth positioning, ultra-wideband positioning, and infrared positioning have been born. With the intelligent development of cit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G01C21/00G01C21/20H04W4/02H04W4/021H04W4/029H04W4/33
CPCG01C21/005G01C21/206G01S5/0252H04W4/021H04W4/026H04W4/027H04W4/029H04W4/33
Inventor 王邦林俊宏杨光
Owner HUAZHONG UNIV OF SCI & TECH
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