Light Positioning Technology Based On Arbitrarily Large Size Lamps

In the traditional indoor visible light positioning research,the size of the lamp is usually ignored as a point light source,and the question of whether the actual size of the lamp will affect the positioning system is ignored.Therefore,the traditional positioning model is too ideal,and the positioning error is not consistent with the actual scene.In order to get closer to the indoor positioning model of the actual scene,we consider the size of the light source in the positioning system and study the indoor positioning error at any size of the light source.Considering the size of the lamp,we can know whether the size of the lamp will affect the positioning system,and how large the size will cause the positioning error,and how large the size of the lamp can be considered as a point light source according to the traditional scheme,and it is unreasonable to consider it as a point light source beyond the size of the lamp.Firstly,this paper introduces the basic principles of indoor visible light positioning,and focuses on the analysis of current problems and the need to consider lamp size.Secondly,in traditional indoor visible light positioning systems,the main factors that cause positioning errors are noise and indoor first reflections,and studies have shown that the first reflections are the main source of poor positioning results.As the traditional research ignores the size of the lamp and treats it as a point light source,and ignores the effect of the actual lamp size on positioning.Therefore,this paper based on the traditional research,considered the actual size of the lamp,and re-examined the main source of positioning error in the case of the large size lamp.In order to verify the feasibility of the proposal,we first theoretically analyzed that the large lamp size would indeed cause positioning errors,and proposed the concept of dimensional errors.Then,this paper simulates the received power and dimensional error of the receiver under different lamp sizes.The research results show that when the lamp size reaches 1.8 m * 0.3 m,the maximum dimensional error is 73 cm,which exceeds the maximum positioning error of the first reflection of the traditional scheme.It is determined that when the size of the lamp reaches this scale,the main source of positioning errors is the size of the lamp rather than the first reflection,and the lamp cannot be regarded as a point light source according to the traditional scheme,and the size of the lamp must be considered during research.In view of the large effect of the lamp dimensional error,we propose a lamp segmentation strategy,which divides the large lamp into several small lamps,and simulates and compares the dimensional error of the divided system and the first reflection positioning error of the traditionalscheme to determine whether The next step of segmentation is needed to further determine the number of segmentation of the large lamp in different room sizes.Aiming at the problem of relatively large positioning error in the edge area,this paper mainly studies the effect of changing the half-power angle of the transmitter and the FOV of the receiver on the positioning error.The simulation results show that the positioning accuracy is higher when considering the lamp size,and the transmitter half power angle and receiver FOV have a larger control range.