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Geomagnetic indoor positioning system based on self-adaptive particle filter algorithm

A particle filter and indoor positioning technology, applied in the field of sensors, can solve problems such as inconvenient use and deviation of magnetic readings

Active Publication Date: 2014-07-16
NANJING UNIV
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  • Claims
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Problems solved by technology

Therefore, the existing method has to require the user to fix the direction of the mobile phone when using it, which is very inconvenient to use
Another difficulty is that the geomagnetic readings of different mobile phones still have deviations in the same location and the same orientation state, which needs to be calibrated

Method used

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Embodiment Construction

[0039] The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0040] Such as figure 1 As shown, an algorithm framework diagram of a geomagnetic indoor positioning system based on an adaptive particle filter algorithm provided by an embodiment of the present invention, figure 1 in:

[0041] At the beginning of positioning, the particle filter needs to randomly generate N particles (101) from the initial positioning area. Whenever the step counting algorithm detects that the user has taken a step, an iteration (102) ...

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Abstract

The invention discloses a geomagnetic indoor positioning system and method based on a self-adaptive particle filter algorithm. The geomagnetic indoor positioning system comprises the novel self-adaptive particle filter algorithm and an efficient geomagnetic fingerprint data collecting unit. The efficient geomagnetic fingerprint data collecting unit has the main function of quickly collecting indoor geomagnetic signals by using a mobile phone magnetometer and converting the indoor geomagnetic signals into a geomagnetic fingerprint model to be stored. The novel self-adaptive particle filter algorithm is the improvement to an existing filter algorithm to improve the robustness, the precision and the usability. The key technology of the self-adaptive particle filter improvement algorithm mainly comprises a self-adaptive behavior model, a novel measurement model, a self-adaptive resampling model and a positioning precision estimation and positioning failure detection model. The geomagnetic indoor positioning system is suitable for various smart phones integrated with acceleration sensors, gyroscopes and magnetometers. The geomagnetic indoor positioning system has the advantages that the facing directions, the placing positions and using of the smart phones are not limited, and positioning precision is high.

Description

Technical field [0001] The invention relates to the fields of sensors, artificial intelligence and mobile computing, and in particular to a system for geomagnetic indoor positioning based on particle filter algorithms and smart phone sensors. Background technique [0002] With the emergence of more and more applications that provide services based on location, the use of mobile phones for accurate indoor positioning has become a major research focus. Because GPS signals are blocked by buildings and cannot be used in indoor environments, researchers have proposed many new indoor positioning methods. Several common methods include: ultrasonic positioning technology, Wi-Fi Fingerprint technology, inertial sensor (acceleration sensor, compass, gyroscope, etc.) positioning technology. [0003] Ultrasonic positioning technology mainly uses ultrasound for distance measurement, and then uses the triangulation method for positioning. Before use, an ultrasonic transponder needs to be arran...

Claims

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Application Information

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IPC IPC(8): G01C21/08G01C21/16
CPCG01C21/08G01C21/165
Inventor 吕建谢宏伟陶先平
Owner NANJING UNIV
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