Visible light indoor positioning method

Abstract

The invention discloses a visible light indoor positioning method. The positioning method is based on a positioning system composed of an LED signal source, a mobile terminal and a control end. The positioning method specifically comprises the following steps that 1 LED-ID information is loaded on the LED signal source and transmitted to the mobile terminal through a wireless optical link, and the mobile terminal determines the LED lighting coverage area according to the received LED-ID information to realize coarse positioning; 2 the mobile terminal conducts query match between obtained fingerprint information and a multi-parameter position fingerprint database, the position, relative to an LED, of the mobile terminal in the area is determined, and fine positioning is realized. According to the multi-parameter position fingerprint database positioning method, it is only required that query matched is conducted between the received fingerprint data (theta and RSSI) and data, in the theta direction in the current LED coverage area, in the fingerprint database to determine the position of the mobile terminal, therefore, the expense at the match stage is greatly reduced, the positioning speed is increased, the positioning precision is improved, and the positioning error is reduced.

Description

technical field [0001] The invention relates to the field of visible light communication indoor positioning technology, in particular to a method for establishing a multi-parameter location fingerprint library. Background technique [0002] At present, wireless positioning technology is mostly used in indoor positioning, such as infrared, ultrasonic, wireless local area network and Bluetooth technology. These positioning technologies can meet people's positioning needs to a certain extent, but they have not been widely popularized due to the shortcomings of these positioning systems, such as instability, high power consumption, and low positioning accuracy. Moreover, in special areas where radio frequency technology is limited or prohibited, such as mines, gas stations, and hospitals, the use of the above-mentioned indoor wireless positioning technologies is restricted to varying degrees. Therefore, it is imminent to develop and utilize new spectrum resources. Visible ligh...

AI Technical Summary

Problems solved by technology

[0005] However, considering the particularity of indoor visible light communication, that is, the light intensity of each sampling point comes from the superposition of the optical power of the line-of-sight and non-line-of-sight optical paths in different directions, so there are multiple sampling points with the same light intensity in the room. If only Taking the light intensity as the sample of the location fingerprint library will inevitably lead to an increase in the location error of the fingerprint library

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