A Pedestrian Location Correction Method Based on Distance Approximation Discrimination Bluetooth

A technology of positioning correction and Bluetooth, which is applied to services based on location information, services based on specific environments, and short-distance communication services. problem, to achieve the effect of improving the accuracy and reliability of correction, avoiding trajectory adjustment, and avoiding frequent wrong corrections

Active Publication Date: 2021-06-15
CHINESE ACAD OF SURVEYING & MAPPING
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AI Technical Summary

Problems solved by technology

However, the Bluetooth proximity discrimination method based on signal strength faces the difficulty of selecting the discrimination threshold in Bluetooth proximity discrimination.
When the threshold value is set too high, the correction range is reduced, and the possibility of users entering the correction area is reduced. There is a problem that the correction point is not recognized and the correction is missed.
When the threshold is set too low, the correction range is enlarged, and there are problems such as premature correction of the user position, large correction errors, obvious jumps of the user trajectory during correction, and stagnation of the user trajectory within a large correction range.

Method used

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  • A Pedestrian Location Correction Method Based on Distance Approximation Discrimination Bluetooth

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Embodiment 1

[0031] Embodiment 1, a pedestrian positioning correction method based on distance approximation discrimination Bluetooth, such as figure 1 shown, including the following steps:

[0032] S1) Establish a bluetooth node network according to the layout of indoor buildings. The bluetooth node network includes several bluetooth nodes, and several bluetooth nodes are respectively located at different positions of the building; different positions of the building include doorways, windows, corners or Entrance and exit etc. The distance between two Bluetooth nodes is set to 20-30 meters.

[0033] S2) Perform parameter initialization configuration on the pedestrian dead reckoning system, initialize the observable Bluetooth node B0 closest to the mobile terminal and the distance value D0 from the observable Bluetooth node B0 to the mobile terminal.

[0034]In step S2), the observable Bluetooth node B0 closest to the mobile terminal is initialized to a null value, and the distance value...

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Abstract

The invention relates to the field of indoor positioning, and discloses a pedestrian positioning correction method based on distance approaching to distinguish Bluetooth, including establishing a Bluetooth node network; performing parameter initialization configuration on pedestrian dead reckoning systems; obtaining the device number of each observable Bluetooth node and signal strength; perform gait recognition according to the accelerometer data; compare the signal strength values ​​of the observable Bluetooth nodes with the signal strength recognition thresholds; obtain the positions of all observable Bluetooth nodes within the vicinity of the mobile terminal according to the device number; Sort the distances from all observable Bluetooth nodes within the vicinity of the mobile terminal to the mobile terminal; judge the proximity of the observable Bluetooth distance; update parameters; perform proximity correction; judge whether to continue positioning. The invention not only overcomes the problems of large correction errors and track jumps in the signal strength threshold method in the prior art, but also improves the PDR correction accuracy and reliability.

Description

technical field [0001] The invention relates to the technical field of indoor positioning, in particular to a pedestrian positioning correction method based on distance approach discrimination Bluetooth. Background technique [0002] At present, in view of the serious cumulative error problem in Pedestrian Dead Reckoning (PDR), many research teams have set up landmark positions in combination with special areas of indoor environments or specific behaviors of users in a certain place to correct the PDR process. The cumulative error problem in . In 2012, Wang et al. proposed UnLoc, which uses WiFi fingerprints at specific locations and sensor data at different locations as landmarks, and UnLoc's landmarks are automatically added to the system; in Shen's 2013 article, indoor elevators, escalators and The corners and other areas that cause special changes in the sensor are used as virtual landmarks, through which the cumulative error in the PDR process is eliminated; in 2015, C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/02H04W4/33H04W4/80H04W64/00
CPCH04W4/023H04W4/027H04W64/006H04W4/33H04W4/80
Inventor 李得海魏盛桃秘金钟党亚民周宁徐浩刘霄陈冲
Owner CHINESE ACAD OF SURVEYING & MAPPING
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