A Geomagnetic Indoor Positioning System Based on Adaptive Particle Filter Algorithm

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, 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, precise indoor positioning using mobile phones has become a major research hotspot. Since the GPS signal is blocked by buildings, it cannot be applied in the indoor environment, so 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, etc. [0003] Ultrasonic positioning technology mainly uses ultrasonic waves for distance measurement, and then uses triangulation distance measurement for positioning. Before use, it is necessary to...

AI Technical Summary

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

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