基于地磁場和智能手機的粒子濾波室內(nèi)定位算法
[Abstract]:With the rapid development of computer technology and artificial intelligence, the application of indoor positioning service is increasing. Among them, indoor positioning technology based on geomagnetic field has gradually become a research hotspot because of its unique advantages such as high positioning accuracy and no need for external facilities. Particle filter algorithm is considered as one of the most promising indoor localization algorithms based on geomagnetic field. However, the existing indoor localization algorithms based on particle filter have the problem of poor particles after resampling, on the other hand, because of the error of behavior model, the localization error is large and the system reliability is not high. In this paper, the problems in particle filter localization algorithm are analyzed and studied. An improved particle filter algorithm is proposed by improving the resampling algorithm, observation model and behavior model. The simulation results show that the error of the proposed algorithm is about 1 meter. The main work of this paper is as follows: by analyzing the measurement characteristics of smart phone sensors and on the basis of the experiment of using different mobile phone measurements to construct geomagnetic field model, this paper puts forward the processing of geomagnetic data in the execution process of the improved algorithm of geomagnetic variation rate; By analyzing the importance of particle weight to the re-adoption process, a sampling method based on the similarity of observation path is proposed, and the similarity is calculated by using relative error. An improved evolutionary resampling particle filter algorithm is proposed to solve the problem of decreasing particle richness after resampling. By analyzing the behavior model error, the particle weighted step size is proposed to replace the fixed step size in the motion model. By analyzing the situation that the orientation of the target is changed to increase the horizontal magnetic field noise, a hybrid matching model is proposed, which combines the 3D component matching model and the HV matching model. Finally, a method of geomagnetic matching is proposed for locating lost targets.
【學(xué)位授予單位】:南京郵電大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN713
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