A linearly attenuated lighting for visible light positioning system based on RSSI

The accuracy of indoor visible light positioning based on received signal strength indicator (RSSI) method has been obviously enhanced in recent years. In the method, inhomogeneous distributed positioning error leads to the partial magnification of the location uncertainty. The uncertainty area is called positioning fade zone. Aiming at the problem, a type of linearly attenuated lighting model is proposed to solve this. The performance of the proposed model is tested by simulation. The result of simulation shows that: The positioning error can be reduced by half using the new lighting model compared with the general model; The positioning fade zone can be effectively eliminated by the new model. By using free-form surface lens design method, an optical lens is formed. With the help of the lens, a lighting source with this new linearly attenuated model is obtained.